检索结果-南通市图书馆

Effects of aggregate size distribution and carbon nanotubes on the mechanical properties of cemented gangue backfill samples under true triaxial compression

引用

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 311-324页

作者： Qian Yin Fan Wen Zhigang Tao Hai Pu Tianci Deng Yaoyao Meng Qingbin Meng Hongwen Jing Bo Meng Jiangyu Wu state key laboratory of Intelligent Construction and Healthy Operation and Maintenance of deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China state key laboratory of mining response and Disaster Prevention and control in deep coal mines Anhui University of Science and TechnologyHuainan 232001China state key laboratory for Geomechanics&deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 100083China key laboratory of Xinjiang coal Resources Green mining Ministry of EducationXinjiang Institute of EngineeringUrumqi 830023China

The mechanical behavior of cemented gangue backfill materials(CGBMs)is closely related to particle size distribution(PSD)of aggregates and properties of cementitious ***,the true triaxial compression tests,CT scanning,SEM,and EDS tests were conducted on cemented gangue backfill samples(CGBSs)with various carbon nanotube concentrations(P_(CNT))that satisfied fractal theory for the PSD of *** mechanical properties,energy dissipations,and failure mechanisms of the CGBSs under true triaxial compression were systematically *** results indicate that appropriate carbon nanotubes(CNTs)effectively enhance the mechanical properties and energy dissipations of CGBSs through micropore filling and microcrack bridging,and the optimal effect appears at P_(CNT)of 0.08wt%.Taking PSD fractal dimension(D)of 2.500 as an example,compared to that of CGBS without CNT,the peak strength(σ_(p)),axial peak strain(ε_(1,p)),elastic strain energy(Ue),and dissipated energy(U_(d))increased by 12.76%,29.60%,19.05%,and90.39%,***,excessive CNTs can reduce the mechanical properties of CGBSs due to CNT agglomeration,manifesting a decrease inρ_(p),ε_(1,p),and the volumetric strain increment(Δε_(v))when P_(CNT)increases from 0.08wt%to 0.12wt%.Moreover,the addition of CNTs improved the integrity of CGBS after macroscopic failure,and crack extension in CGBSs appeared in two modes:detour and pass through the ***σ_(p)and U_(d)firstly increase and then decrease with increasing D,and porosity shows the opposite ***ε_(1,p)andΔε_(v)are negatively correlated with D,and CGBS with D=2.150 has the maximum deformation parameters(ε_(1,p)=0.05079,Δε_(v)=0.01990)due to the frictional slip effect caused by coarse *** increasing D,the failure modes of CGBSs are sequentially manifested as oblique shear failure,"Y-shaped"shear failure,and conjugate shear failure.

关键词： cemented gangue backfill materials particle size distribution true triaxial compression test carbon nanotubes mechanical properties failure modes

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Self-sacrificial templating synthesis of flower-like nickel phyllosilicates and its application as high-performance reinforcements in epoxy nanocomposites

引用

Frontiers of Chemical Science and Engineering 2022年第4期16卷 484-497页

作者： Jinian Yang Xuesong Feng Shibin Nie Yuxuan Xu Zhenyu Li School of Materials Science and Engineering State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal MinesAnhui University of Science and TechnologyHuainan 232001China School of Safety Science and Engineering State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal MinesAnhui University of Science and TechnologyHuainan 232001China

The nanocomposites of flower-like nickel phyllosilicate particles incorporated into epoxy resin were fabricated via an in-situ mixing *** flower-like nickel phyllosilicate particles were firstly synthesized using a mild self-sacrificial templating method,and the morphology and lamellar structure were examined *** properties of mechanical,thermal and tribological responses of epoxy nanocomposites were *** was demonstrated that adequate flower-like nickel phyllosilicate particles dispersed well in the matrix,and the nanocomposites displayed enhanced tensile strength and elastic modulus but decreased elongation at break as *** addition,friction coefficient and wear rate were increased first and then decreased along with the particle content,and showed the lowest values at a mass fraction of 5%.Nevertheless,the incorporated flower-like nickel phyllosilicate particles resulted in the continuously increasing thermal stability of epoxy resin(EP)*** study revealed the giant potential of flower-like particles in preparing high-quality EP nanocomposites.

关键词： nickel phyllosilicate flow-like structure mechanical property thermal stability tribological performance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nickel-based metal-organic framework-derived whisker-shaped nickel phyllosilicate toward efficiently enhanced mechanical,flammable and tribological properties of epoxy nanocomposites

引用

Frontiers of Chemical Science and Engineering 2022年第10期16卷 1493-1504页

作者： Yuxuan Xu Guanglong Dai Shibin Nie Jinian Yang Song Liu Hong Zhang Xiang Dong School of Safety Science and Engineering State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal MinesAnhui University of Science and TechnologyHuainan 232001China School of Materials Science and Engineering State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal MinesAnhui University of Science and TechnologyHuainan 232001China

Metal−organic framework-derived materials have attracted significant attention in the applications of functional *** this work,the rod-like nickel-based metal−organic frameworks were first synthesized and subsequently employed as the hard templates and nickel sources to prepare the whisker-shaped nickel phyllosilicate using a facile hydrothermal ***,the nickel phyllosilicate whiskers were evaluated to enhance the mechanical,thermal,flammable,and tribological properties of epoxy *** results show that adequate nickel phyllosilicate whiskers can disperse well in the matrix,improving the tensile strength and elastic modulus by 13.6%and 56.4%,*** the addition of nickel phyllosilicate whiskers could not obtain any UL-94 ratings,it enhanced the difficulty in burning the resulted epoxy resin nanocomposites and considerably enhanced thermal ***,it was demonstrated that such nickel phyllosilicate whiskers preferred to improve the wear resistance instead of the antifriction ***,the wear rate of epoxy resin nanocomposites was reduced significantly by 80%for pure epoxy resin by adding 1 phr *** as-prepared nickel phyllosilicate whiskers proved to be promising reinforcements in preparing of high-performance epoxy resin nanocomposites.

关键词： metal−organic framework nickel phyllosilicate whisker epoxy resin mechanical response tribological performance flammable property

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Fluidity Influencing Factor Analysis and Ratio Optimization of New Filling Slurry Based on the response Surface Method

引用

Journal of Renewable Materials 2022年第5期10卷 1439-1458页

作者： Guanfeng Chang Xinzhu Hua Xiao Liu Chen Li Enqian Wang Bingjun Sun state key laboratory of mining response and Disaster Prevention and control in deep coal mines Anhui University of Science and TechnologyHuainan232001China

The filling mining method is important in realizing the green mining of mineral *** at the problems of land resource occupation,environmental pollution,and rational utilization of coal-based solid wastes such as coal gangue,fly ash,and desulfurization gypsum,a new paste filling material was developed with coal gangue,fly ash,and desulfurization gypsum as raw *** microstructure of the raw materials was analyzed by XRD and *** with the Box-Behnken experimental design,the effect of each component on the fluidity of the filling slurry was analyzed through the response surface *** significance of each component on its bleeding and fluidity was determined,and the optimal ratio of the filling slurry was *** results show that the microcosmic morphology of coal gangue,desulfurization gypsum,and gasification slag presents an irregular block and rough particle surface;the microcosmic morphology of fly ash and bottom slag presents first out spherical or quasi spherical ***,obvious sintering traces exist on the surface of the bottom *** main crystal mineral of coal gangue and fly ash is SiO_(2),the desulfurization gypsum is composed of Ca(SO_(4))(H_(2)O)and Ca(CO_(3))crystal minerals,the gasification slag is composed of carbon and nitrogen compounds,and the main crystal mineral components in the bottom slag sample are SiO_(2) and Al_(x)Si_(y)O_(z) *** order of significance of each key factor on slurry fluidity is as follows:C(desulfurization gypsum)>D(gasification slag and bottom slag 1:1)>A(coal gangue)>B(fly ash).The order of the significance of each key factor on slurry bleeding is as follows:B(fly ash)>C(desulfurization gypsum)>D(gasification slag and bottom slag 1:1)>A(coal gangue).Considering the material preparation,field application,and other conditions,the mass percentage of each factor content of the new paste filling material is as follows:49.5%coal gangue,8.3%fly ash,4.1%desulfur

关键词： coal-based solid waste filling slurry flowability proportion optimization response surface method

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Application and prospects of 3D printing in physical experiments of rock mass mechanics and engineering:materials,methodologies and models

引用

International Journal of coal Science & Technology 2023年第1期10卷 1-17页

作者： Qingjia Niu Lishuai Jiang Chunang Li Yang Zhao Qingbiao Wang Anying Yuan state key laboratory of mining Disaster Preventionand control Shandong University of Scienceand TechnologyQingdao 266590China state key laboratory of mining response and disasterprevention and control in deep coal mines AnhuiUniversity of Science and TechnologyHuainan 232001China College of Resources Shandong University of Scienceand TechnologyTaian 271019China

The existence of joints or other kinds of discontinuities has a dramatic efect on the stability of rock excavations and *** a result,a great challenge in rock mass mechanics testing is to prepare rock or rock-like samples with *** recent years,3D printing technology has become a promising tool in the feld of rock mass mechanics and *** study frst reviews and discusses the research status of traditional test methods in rock mass mechanics tests of making rock samples with ***,based on the comprehensive analysis of previous research,the application of 3D printing technology in rock mass mechanics is expounded from the following three *** frst is the printing *** there are many materials for 3D printing,it has been found that 3D printing materials that can be used for rock mass mechanics research are very *** research,we summarize and evaluate printing material that can be used for rock mass mechanics *** second is the printing methodology,which mainly introduces the current application forms of 3D printing technology in rock mass *** includes printed precise casting molds and one-time printed *** last one is the printing model,which includes small-scale samples for mechanical tests and large-scale physical ***,the benefts and drawbacks of using 3D printing samples in mechanical tests and the validity of their simulation of real rock are *** with traditional rock samples collected in nature or synthetic rock-like samples,the samples made by 3D printing technology have unique advantages,such as higher test repeatability,visualization of rock internal structure and stress *** is thus great potential for the use of 3D printing in the feld of rock mass ***,3D printing materials also have shortcomings,such as insufcient material strength and accuracy at this ***,the application prospect of 3D printing technology in

关键词： 3D printing Rock mass mechanics Prefabricated cracks Rock-like material Fractured rock mass

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

mining pressure monitoring and analysis in fully mechanized backfilling coal mining face-A case study in Zhai Zhen coal Mine

引用

Journal of Central South University 2015年第5期22卷 1965-1972页

作者：张强张吉雄康涛孙强李伟康 key laboratory of deep coal Resource mining of Ministry of Education(School of mines China University of Mining & Technology)

Fully mechanized solid backfill mining(FMSBM) technology adopts dense backfill body to support the roof. Based on the distinguishing characteristics and mine pressure control principle in this technology, the basic principles and methods for mining pressure monitoring were analyzed and established. And the characteristics of overburden strata movement were analyzed by monitoring the support resistance of hydraulic support, the dynamic subsidence of immediate roof, the stress of backfill body, the front abutment pressure, and the mass ratio of cut coal to backfilled materials. On-site strata behavior measurements of 7403 W solid backfilling working face in Zhai Zhen coal Mine show that the backfill body can effectively support the overburden load, obviously control the overburden strata movement, and weaken the strata behaviors distinctly. Specific performances are as follows. The support resistance decreases obviously; the dynamic subsidence of immediate roof keeps consistent to the variation of backfill body stress, and tends to be stable after the face retreating to 120-150 m away from the cut. The peak value of front abutment pressure arises at 5-12 m before the operating face, and mass ratio is greater than the designed value of 1.15, which effectively ensures the control of strata movement. The research results are bases for intensively studying basic theories of solid backfill mining strata behaviors and its control, and provide theoretical guidance for engineering design in FMSBM.

关键词： fully mechanized solid backfill mining(FMSBM) strata movement strata behavior mining pressure monitoring

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Horizontal roof gap of backfill hydraulic support

引用

Journal of Central South University 2015年第9期22卷 3544-3555页

作者：张强张吉雄邰阳方坤殷伟 key laboratory of deep coal Resource mining of Ministry of Education of China (School of Mines China University of Mining & Technology)

For the backfill hydraulic support as the key equipment for achieving integration of backfilling and coal mining simultaneously in the practical process, its characteristics will directly influence the backfill body's compression ratio. Horizontal roof gap, as a key parameter of backfilling characteristics, may impact the backfilling effect from the aspects of control of roof subsidence in advance, support stress, backfilling process and the support design. Firstly, the reason why horizontal roof gap exists was analyzed and its definition, causes and connotation were introduced, then adopting the Pro/E 3D simulation software, three typical 3D entity models of backfill hydraulic supports were built, based on the influence of horizontal roof gap on backfilling effect, and influence rules of four factors, i.e. support height, suspension height, suspension angle and tamping angle, were emphatically analyzed on horizontal roof gap. The results indicate that, the four factors all have significant impacts on horizontal roof gap, but show differences in influence trend and degree, showing negative linear correlation, positive linear correlation, positive semi-parabolic correlation and negative semi-parabolic correlation, respectively. Four legs type is the most adaptive to the four factors, while six legs(II) type has the poorest adaptability, and the horizontal roof gap is small under large support height, small suspension height, small suspension angle and large tamping angle situation. By means of optimizing structure components and their positional relation and suspension height of backfill scrape conveyor in the process of support design and through controlling working face deployment, roof subsidence in advance, mining height and backfilling during engineering application, the horizontal roof gap is optimized. The research results can be served as theoretical basis for support design and guidance for backfill support to have better performance in backfilling.

关键词： horizontal roof gap backfill hydraulic support support height suspension height suspension angle tamping angle

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influential factors and control of water inrush in a coal seam as the main aquifer

引用

International Journal of mining Science and Technology 2018年第2期28卷 187-193页

作者： Gao Rui Yan Hao Ju Feng Mei Xianchen Wang Xiulin key laboratory of deep coal Resource mining Ministry of Education School of Mines China University of Mining and Technology state key laboratory for Geomechanics & deep Underground Engineering China University of Mining and Technology Huadian coal Industry Group Co. Ltd.

In this paper, a combination of field measurement, theoretical analysis and numerical simulation were used to study the main control factors of coal mine water inrush in a main aquifer coal seam and its control scheme. On the basis of revealing and analyzing the coal seam as the main aquifer in western coal mine of Xiao Jihan coal mine, the simulation software of PHASE-2D was applied to analyze the water inflow under different influencing factors. The results showed that water inflow increases logarithmically with the coal seam thickness, increases as a power function with the permeability coefficient of the coal seam, and increases linearly with the coal seam burial depth and the head pressure; The evaluation model for the factors of coal seam water inrush was gained by using nonlinear regression analysis with SPSS. The mine water inrush risk evaluation partition within the scope of the mining field was obtained,through the engineering application in Xiao Jihan coal mine. To ensure the safe and efficient production of the mine, we studied the coal mine water disaster prevention and control measures of a main aquifer coal seam in aspects of roadway driving and coal seam mining.

关键词： coal seam Main aquifer Water inrush Influential factors control

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mechanical responses and acoustic emission behaviors of coal under compressive differential cyclic loading(DCL):a numerical study via 3D heterogeneous particle model

引用

International Journal of coal Science & Technology 2023年第3期10卷 136-154页

作者： Zhengyang Song Yunfeng Wu Yong Zhang Yi Yang Zhen Yang state key laboratory of Water Resource Protection and Utilization in coal mining BeijingChina Department of Civil Engineering University of Science&Technology BejingBeijing 100083China state key laboratory of mining response and Disaster Prevention and control in deep coal mines Anhui University of Science and TechnologyHuainan 232001China

The stability of coal walls(pillars)can be seriously undermined by diverse in-situ dynamic *** on a 3D par-ticle model,this work strives to numerically replicate the major mechanical responses and acoustic emission(AE)behaviors of coal samples under multi-stage compressive cyclic loading with different loading and unloading rates,which is termed differential cyclic loading(DCL).A Weibull-distribution-based model with heterogeneous bond strengths is constructed by both considering the stress-strain relations and AE *** previously loaded samples were respectively grouped to indicate two DCL regimes,the damage mechanisms for the two groups are explicitly characterized via the time-stress-dependent variation of bond size multiplier,and it is found the two regimes correlate with distinct damage patterns,which involves the competition between stiffness hardening and *** numerical b-value is calculated based on the mag-nitudes of AE energy,the results show that both stress level and bond radius multiplier can impact the numerical *** proposed numerical model succeeds in replicating the stress-strain relations of lab data as well as the elastic-after effect in DCL *** effect of damping on energy dissipation and phase shift in numerical model is summarized.

关键词： Differential cyclic loading(DCL) Particle model Acoustic emission(AE) Discrete element method(DEM)Damage mechanism

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research on the "three shells" cooperative support technology of large-section chambers in deep mines

引用

International Journal of mining Science and Technology 2021年第4期31卷 665-680页

作者： Cheng Zhu Yong Yuan Wenmiao Wang Zhongshun Chen Shengzhi Wang Huiwei Zhong key laboratory of deep coal Resources mining Ministry of Education of ChinaChina University of Mining and TechnologyXuzhou 221116China School of mines State Key Laboratory of Coal Resources&Safe MiningChina University of Mining and TechnologyXuzhou 221116China

The"three shells"cooperative support technology was proposed herein according to both the large deformation of the rock surrounding large-section chambers in deep mines and the precarious stability of the support structures *** development range of the plastic zone in the surrounding rock was controlled by a stress shell to reduce the difficulty of controlling the surrounding ***,the residual strength of the rock mass in the plastic zone and the self-bearing capacity of the surrounding rock were improved by a reinforced load-bearing ***,a passive load-bearing shell could restore the triaxial stress state of the surrounding rock on the free surface,reduce the influence of the external environment on the surrounding rock,and reinforce the surrounding rock with the strength of the *** layouts of large-section chambers were determined by analyzing the control effect of the stress shell on the surrounding rock under three kinds of in situ stress *** orthogonal test method was applied to reveal the influences of different support parameters in the reinforced loadbearing shell and passive load-bearing shell on the surrounding rock *** surrounding rock control effect of the"three shells"collaborative support technology was analyzed through numerical simulation and field *** results show that the maximum displacement between the roof and floor of the coal preparation chamber in the Xinjulong coal mine was approximately 48 mm,and the maximum displacement between its two sides was approximately 65 mm,indicating that the technology proposed herein could meet the long-term control requirements of the surrounding rock stability for large-section chambers in deep mines.

关键词： deep mining Large-section chamber "Three shells"cooperative support Reasonable layout Surrounding rock control

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：