检索结果-南通市图书馆

Three-dimensional stress variation characteristics in deep hard rock of CJPL-Ⅱ project based on in-situ monitoring

International Journal of Mining Science and Technology 2024年第2期34卷 179-195页

作者： Minzong Zheng shaojun li Zejie Feng Huaisheng Xu Yaxun Xiao State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

In deep hard rock excavation, stress plays a pivotal role in inducing stress-controlled failure. While the impact of excavation-induced stress disturbance on rock failure and tunnel stability has undergone comprehensive examination through laboratory tests and numerical simulations, its validation through insitu stress tests remains unexplored. This study analyzes the three-dimensional stress changes in the surrounding rock at various depths, monitored during the excavation of B2 Lab in China Jinping Underground Laboratory Phase Ⅱ(CJPL-Ⅱ). The investigation delves into the three-dimensional stress variation characteristics in deep hard rock, encompassing stress components and principal stress. The results indicate changes in both the magnitude and direction of the principal stress during tunnel excavation. To quantitatively describe the degree of stress disturbance, a series of stress evaluation indexes are established based on the distances between stress tensors, including the stress disturbance index(SDI), the principal stress magnitude disturbance index(SDIm), and the principal stress direction disturbance index(SDId). The SDI indicates the greatest stress disturbance in the surrounding rock is 4.5 m from the tunnel wall in B2 Lab. SDIm shows that the principal stress magnitude disturbance peaks at2.5 m from the tunnel wall. SDId reveals that the largest change in principal stress direction does not necessarily occur near the tunnel wall but at a specific depth from it. The established relationship between SDI and the depth of the excavation damaged zone(EDZ) can serve as a criterion for determining the depth of the EDZ in deep hard rock engineering. Additionally, it provides a reference for future construction and support considerations.

关键词： Disturbance stress Tensor distance Stress disturbance index Principal stress direction Underground research laboratory

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

Uncertainty quantification of inverse analysis for geomaterials using probabilistic programming

引用

Journal of Rock Mechanics and Geotechnical Engineering 2024年第3期16卷 895-908页

作者： Hongbo Zhao shaojun li Xiaoyu Zang Xinyi liu lin Zhang Jiaolong Ren School of Civil Engineering and Geomatics Shandong University of TechnologyZibo255000China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

Uncertainty is an essentially challenging for safe construction and long-term stability of geotechnical *** inverse analysis is commonly utilized to determine the physico-mechanical ***,conventional inverse analysis cannot deal with uncertainty in geotechnical and geological *** this study,a framework was developed to evaluate and quantify uncertainty in inverse analysis based on the reduced-order model(ROM)and probabilistic *** ROM was utilized to capture the mechanical and deformation properties of surrounding rock mass in geomechanical *** programming was employed to evaluate uncertainty during construction in geotechnical engineering.A circular tunnel was then used to illustrate the proposed framework using analytical and numerical *** results show that the geomechanical parameters and associated uncertainty can be properly obtained and the proposed framework can capture the mechanical behaviors under ***,a slope case was employed to demonstrate the performance of the developed *** results prove that the proposed framework provides a scientific,feasible,and effective tool to characterize the properties and physical mechanism of geomaterials under uncertainty in geotechnical engineering problems.

关键词： Geological engineering Geotechnical engineering Inverse analysis Uncertainty quantification Probabilistic programming

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

Microdynamic mechanical properties and fracture evolution mechanism of monzogabbro with a true triaxial multilevel disturbance method

引用

International Journal of Mining Science and Technology 2024年第3期34卷 385-411页

作者： Zhi Zheng Bin Deng Hong liu Wei Wang Shuling Huang shaojun li State Key Laboratory of Featured Metal Materials and life-cycle Safety for Composite Structures Key Laboratory of Disaster Prevention and Structural Safety of Ministry of EducationCollege of Civil Engineering and ArchitectureGuangxi UniversityNanning 530004China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources Changjiang River Scientific Research InstituteWuhan 430015China

The far-field microdynamic disturbance caused by the excavation of deep mineral resources and underground engineering can induce surrounding rock damage in high-stress conditions and even lead to ***,the mechanical properties and damage/fracture evolution mechanisms of deep rock induced by microdynamic disturbance under three-dimensional stress states are ***,a true triaxial multilevel disturbance test method is proposed,which can completely simulate natural geostress,excavation stress redistribution(such as stress unloading,concentration and rotation),and subsequently the microdynamic disturbance triggering damaged rock *** on a dynamic true triaxial test platform,true triaxial microdynamic disturbance tests under different frequency and amplitudes were carried out on *** results show that increasing amplitude or decreasing frequency diminishes the failure strength of *** modulus gradually decreases during disturbance *** frequency and amplitude increase,the degradation rate of deformation modulus decreases slightly,disturbance dissipated energy increases significantly,and disturbance deformation anisotropy strengthens obviously.A damage model has been proposed to quantitatively characterize the disturbance-induced damage evolution at different frequency and amplitude under true triaxial *** disturbance failure,the micro-tensile crack mechanism is dominant,and the micro-shear crack mechanism increases significantly at *** the increase of amplitude and frequency,the micro-shear crack mechanism *** approaching disturbance failure,the acoustic emission fractal dimension changes from a stable value to local large oscillation,and finally increases sharply to a high value at ***,the disturbance-induced failure mechanism of surrounding rock in deep engineering is clearly elucidated.

关键词： True triaxial disturbance test Mechanical properties Fracture evolution mechanism Disturbance-induced damage evolution Failure mechanism and precursor

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

Investigation of stress-induced progressive failure of mine pillars using a Voronoi grain-based breakable block model

引用

International Journal of Mining Science and Technology 2024年第5期34卷 713-729页

作者： Shili Qiu Shirui Zhang Quan Jiang shaojun li Hao Zhang Qiankuan Wang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The Voronoi grain-based breakable block model(VGBBM)based on the combined finite-discrete element method(FDEM)was proposed to explicitly characterize the failure mechanism and predict the deformation behavior of hard-rock mine *** influence of the microscopic parameters on the macroscopic mechanical behavior was investigated using laboratory-scale *** field-scale pillar models(width-to-height,W/H=1,2 and 3)were calibrated based on the empirically predicted stress-strain curves of Creighton mine *** results indicated that as the W/H ratios increased,the VGBBM effectively predicted the transition from strain-softening to pseudo-ductile behavior in pillars,and explicitly captured the separated rock slabs and the V-shaped damage zones on both sides of pillars and conjugate shear bands in core zones of *** volumetric strain field revealed significant compressional deformation in core zones of *** the peak strains of W/H=1 and 2 pillars were relatively consistent,there were significant differences in the strain energy storage and release mechanism.W/H was the primary factor influencing the deformation and strain energy in the pillar *** friction coefficient of the structural plane was also an important factor affecting the pillar strength and the weakest discontinuity *** fracture surface was controlled by the discontinuity angle and the friction *** study demonstrated the capability of the VGBBM in predicting the strengths and deformation behavior of hard-rock pillars in deep mine design.

关键词： Pillar strength FDEM Voronoi tessellation Spalling Bulking

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

Inverting the rock mass P-wave velocity field ahead of deep buried tunnel face while borehole drilling

引用

International Journal of Mining Science and Technology 2024年第5期34卷 681-697页

作者： liu liu shaojun li Minzong Zheng Dong Wang Minghao Chen Junbo Zhou Tingzhou Yan Zhenming Shi State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China China Railway Eryuan Engineering Group CO. LTD.Chengdu 610031China Department of Hydraulic and Hydropower Engineering Tsinghua UniversityBeijing 100084China Hubei Communications Planning and Design Institute CO. LTD.Wuhan 430051China Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai 200092China

Imaging the wave velocity field surrounding a borehole while drilling is a promising and urgently needed approach for extending the exploration range of the borehole *** paper develops a drilling process detection(DPD)system consisting of a multifunctional sensor and a pilot geophone installed at the top of the drilling rod,geophones at the tunnel face,a laser rangefinder,and an onsite computer.A weighted adjoint-state first arrival travel time tomography method is used to invert the P-wave velocity field of rock mass while borehole drilling.A field experiment in the ongoing construction of a deep buried tunnel in southwestern China demonstrated the DPD system and the tomography ***-frequency analysis of typical borehole drilling detection data shows that the impact drilling source is a pulse-like seismic exploration wavelet.A velocity field of the rock mass in a triangular area defined by the borehole trajectory and geophone receiving line can be *** the borehole core and optical image validate the inverted P-wave velocity field.A numerical simulation of a checkerboard benchmark model is used to test the tomography *** rapid convergence of the misfits and consistent agreement between the inverted and observed travel times validate the P-wave velocity imaging.

关键词： Deep buried tunnel Wave velocity field Borehole drilling Tomography Rock mass

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

清末民初日本操控湖南水口山矿举措及其落败

引用

近代史研究 2024年第1期 84-97,M0005页

作者：李少军武汉大学历史学院

长沙自主开埠前后,日本加紧对湖南扩张,步德国后尘,企图取水口山铅锌等矿物资源。在清末民初,其官、商、军携手,利用湖南财政困难和某些势力的资金需求,多次以操控水口山矿为条件,与湖南当政者及北京政府等进行借款交涉。其时湖南绅民... 详细信息

长沙自主开埠前后,日本加紧对湖南扩张,步德国后尘,企图取水口山铅锌等矿物资源。在清末民初,其官、商、军携手,利用湖南财政困难和某些势力的资金需求,多次以操控水口山矿为条件,与湖南当政者及北京政府等进行借款交涉。其时湖南绅民维护矿权意识强烈,坚决抵制。因水口山矿本身无求于日债,德、美相继牵制日本,南北之争的因素也渗入其间,终使日本搁置操控该矿之举措。较同一时期被日本操控的大冶铁矿,水口山矿避免了沉沦的命运。

关键词：水口山矿中外矿权交涉大冶铁矿

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

基于光纤光栅的深部硬岩隧洞三维扰动应力测试系统研制及工程应用

引用

岩石力学与工程学报 2024年第2期43卷 261-274页

作者：李邵军郑民总中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室湖北武汉430071

扰动应力及其演化是深埋隧洞围岩稳定性及灾变的最重要因素,目前对硬质围岩三维扰动应力的研究局限于解析解和数值模拟,缺乏可靠的原位测试技术与装备。考虑深部硬岩隧洞工程复杂地质环境,系统分析扰动应力的测试原理和理论基础,研发基... 详细信息

扰动应力及其演化是深埋隧洞围岩稳定性及灾变的最重要因素,目前对硬质围岩三维扰动应力的研究局限于解析解和数值模拟,缺乏可靠的原位测试技术与装备。考虑深部硬岩隧洞工程复杂地质环境,系统分析扰动应力的测试原理和理论基础,研发基于光纤光栅与空心包体的扰动应力综合传感技术,研制三维扰动应力单孔多点分布式原位测试系统;通过密封油压高精度标定设备,实现对空心包体单元光栅和传感器装置的整体精确标定,结合室内混凝土模型试验,验证了应力测试系统的准确性。以锦屏地下实验室二期隧洞工程为依托,开展扰动应力现场测试,首次原位测试获得深部硬岩隧洞开挖过程中不同深度的三维扰动应力变化,系统分析扰动应力大小、方向的演化特征、规律及其与施工活动的关系,并进一步验证光纤光栅空心包体应力测试系统的工程适用性和可靠性。研究成果为深部硬岩工程扰动应力测试和演化特性研究提供了科学方法和技术支撑。

关键词：地下工程深部硬岩隧洞三维扰动应力光纤光栅原位测试

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

不同宿主朊病毒的发现历程

引用

生物学教学 2024年第7期49卷 2-5页

作者：毕若瑶石尚轩李绍军西北农林科技大学生命科学学院上海科技大学生命科学学院

朊病毒是畸形的致病因子，能够诱导特定正常胞内蛋白进行异常折叠，在动物、人类、真菌、植物、细菌以及病毒中先后发现了朊病毒。本文回顾了各类不同宿主朊病毒的发现、确认过程及其研究进展，以期为生物学教学提供参考。

关键词：蛋白质侵染因子朊粒朊蛋白朊毒体

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

车载升降式光电云台共振抑制方法研究

引用

红外技术 2024年第4期46卷 406-412页

作者：李绍军李英杰李威徐哲王国右徐妍荆凡胜北方信息控制研究院集团有限公司江苏南京210000

为避免视场遮挡,光电云台通常置于升降式桅杆顶端,桅杆的结构刚度将直接影响云台伺服系统的刚度,继而影响云台动态性能。实际使用时发现,由于桅杆刚度不足导致云台在方位向转动过程中极易发生共振,引起云台工作不稳定。针对该问题文中... 详细信息

为避免视场遮挡,光电云台通常置于升降式桅杆顶端,桅杆的结构刚度将直接影响云台伺服系统的刚度,继而影响云台动态性能。实际使用时发现,由于桅杆刚度不足导致云台在方位向转动过程中极易发生共振,引起云台工作不稳定。针对该问题文中先后引入巴特沃斯低通滤波器、陷波滤波器和线性自抗扰控制方式对升降式光电云台共振现象进行抑制,通过对比三种方式的优缺点发现采用线性自抗扰控制方式具有响应速度快、共振抑制效果好、鲁棒性好的优点,适宜应用于升降式光电云台控制系统。

关键词：光电云台升降式桅杆巴特沃斯滤波器陷波滤波器线性自抗扰控制

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

考虑流体热物理性质动态演化的高温岩石粗糙裂隙渗流传热效应研究

引用

岩石力学与工程学报 2024年第6期43卷 1359-1370页

作者：申林方苏威张家明王志良李邵军徐则民昆明理工大学建筑工程学院云南昆明650500 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室湖北武汉430071

为了研究高温岩体粗糙裂隙渗流-传热耦合作用机制,提高地热能的开采效率,基于格子Boltzmann方法采用双分布函数分别模拟渗流速度场及传热温度场的演化过程,考虑流体温度对其运动黏度及热扩散系数的影响,建立模拟粗糙岩石裂隙渗流-传热... 详细信息

为了研究高温岩体粗糙裂隙渗流-传热耦合作用机制,提高地热能的开采效率,基于格子Boltzmann方法采用双分布函数分别模拟渗流速度场及传热温度场的演化过程,考虑流体温度对其运动黏度及热扩散系数的影响,建立模拟粗糙岩石裂隙渗流-传热过程的数值计算模型,并结合经典算例验证计算模型的准确性。最后,基于该模型研究裂隙壁面粗糙程度、流体热物理参数动态演化等因素对其渗流-传热耦合作用机制的影响,并讨论裂隙壁面粗糙程度与地热提取性能指标之间的联系。研究表明:粗糙裂隙壁面的阻碍作用会增大惯性压降,降低渗流流速,使得流体与岩石基质间的传热更充分,出口处的流体温度更高。忽略流体温度对其运动黏度的影响,将会严重高估裂隙内的渗流流速,并低估其热突破时间。随着裂隙壁面粗糙程度的加剧,其热突破时间逐渐增加,而采热速率则呈减小的趋势。当裂隙壁面分形维数为1.0798时,其热突破时间比光滑裂隙增加了191.49%;而采热速率则仅为44.36%。此外,在裂隙两端压降相同的情况下,其壁面越光滑,在相同时间内获得的热回收率越高,但由于其热突破时间较短,使得在热突破时刻的热回收率显著降低。

关键词：岩石力学粗糙裂隙地热渗流-传热耦合格子Boltzmann方法

来源：

维普期刊数据库

同方期刊数据库

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：