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Comparative study on bearing mechanism and design parameters of confined concrete arch joints in deep soft rock roadway

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International Journal of Coal Science & Technology 2019年第4期6卷 493-504页

作者： Wei Lu Qi Wang Bei Jiang Shuo Xu Bohong Liu Peng Zhang Zhenhua Jiang Research center of geotechnical and Structural Engineering Shandong UniversityJinan 250061China Key Laboratory for geo-mechanics and Deep Underground Engineering China University of Mining and TechnologyBeijingChina School of Civil Engineering and Architecture University of JinanJinan 250022China

Square confined concrete arch is increasingly used in deep soft rock roadway support because of its advantages of high strength and construction ***,the design of confined concrete arch in underground engineering still remains in experience-based method and lacks quantitative *** a connecting component between arch sections,the connection joints have an important influence on the internal force distribution and failure mechanism of support ***,a reasonable design of arch joints is the premise of rational support *** Liangjia Coal Mine,a typical deep soft rock mine in China,as research background,this paper fully compared the most widely used joint types of confined concrete arch as analytical objects:flange joints and casing *** main failure modes of these two kinds of joints under bending moment are *** and numerical tests are carried out to study the mechanical characteristics of *** on the M-θ curve,the influence law of different design parameters is analyzed,and the design principles of joints are *** research results could provide a theoretical basis for the design and application of confined concrete arch in related projects.

关键词： Confined concrete arch Soft rock roadway Bearing mechanism Failure mode Casing joint

Mechanical properties and influence mechanism of confined concrete arches in high-stress tunnels

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International Journal of Mining Science and Technology 2023年第7期33卷 829-841页

作者： Bei Jiang Zhongxin Xin Xiufeng Zhang Yusong Deng Mingzi Wang Shidong Li Wentao Ren State Key Laboratory for geo-mechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Research center of geotechnical and Structural Engineering Shandong UniversityJinan 250061China Shandong Energy Group Co. Ltd.Jinan 250014China

Deep underground projects(e.g., coal mines), are often faced with complex conditions such as high stress and extremely soft rock. The strength and rigidity of the traditional support system are often insufficient,which makes it difficult to meet the requirements of ground control under complex conditions. As a new support form with high strength and rigidity, the confined concrete arch plays an important role in controlling the rock deformation under complex conditions. The section shape of the tunnel has an important impact on the mechanical properties and design of the support system. However, studies on the mechanical properties and influence mechanism of the new confined concrete arch are rarely reported. To this end, the mechanical properties of traditional U-shaped steel and new confined concrete arches are compared and comparative tests on arches of circular and straight-leg semicircular shapes in deep tunnels are conducted. A large mechanical testing system for underground engineering support structure is developed. The mechanical properties and influence mechanism of confined concrete arches with different section shapes under different loading modes and cross-section parameters are systematically studied. Test results show that the bearing capacity of the confined concrete arch is 2.10 times that of the U-shaped steel arch, and the bearing capacity of the circular confined concrete arch is 2.27 times that of the straight-leg semicircular arch. Among the various influencing factors and their engineering parameters,the lateral stress coefficient has the greatest impact on the bearing capacity of the confined concrete arch,followed by the steel pipe wall thickness, steel strength, and core concrete strength. Subsequently, the economic index of bearing capacity and cost is established, and the optimization design method for the confined concrete arch is proposed. Finally, this design method is applied to a high-stress tunnel under complex conditions, and the d

关键词： High-stress tunnel Confined concrete arch Section shape Mechanical properties Design method

Applicability of Time Domain Reflectometry for Yuhuangge Landslide Monitoring

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Journal of Earth Science 2010年第6期21卷 856-860页

作者：晏鄂川宋琨李红刚 Three Gorges Research center for geo-hazard Ministry of Education Faculty of Engineering China University of Geosciences The 3rd Railway Survey and Architecture Institute

Yuhuangge （玉皇阁） landslide in Wushan （巫山）, Chongqing （重庆）, is one of the focal monitoring geological hazards in the Three Gorges Reservoir. Time domain reflectometry （TDR） and in-place inclinometers were arranged to monitor the deep deformation. Time domain reflectometry is based on transmitting an electromagnetic pulse into a coaxial cable grouted in rock or soil mass and watching for reflections of this transmission due to cable deformity induced by the ground deformation. Comparing the monitoring data of No. 5 Station, in the middle profile of the landslide, from June to December of 2008, the depth of slip surface determined by TDR is -33.58 m, which is consistent with the geological condition of the borehole nearby. The deformation curve trend of the TDR and inclinometer is similar, and it is uniform with the deformation caused by the Three Gorges Reservoir 175 m experimental impoundment. Further, TDR can monitor the tiny deformation accurately. Therefore, TDR is applicable to monitor the Yuhuangge landslide deep deformation and reflect the deformation characteristics well. It is significant to promote the application of TDR in landslide monitoring.

关键词： time domain reflectometry Yuhuangge landslide applicability deformation monitoring fluctuation of reservoir level.

Comparative study of model tests on automatically formed roadway and gob-side entry driving in deep coal mines

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International Journal of Mining Science and Technology 2021年第4期31卷 591-601页

作者： Qi Wang Manchao He Shucai Li Zhenhua Jiang Yue Wang Qian Qin Bei Jiang State Key Laboratory for geo-mechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China Research Institute of Deep Underground Science and Engineering China University of Mining and Technology-BeijingBeijing 100083China Research center of geotechnical and Structural Engineering Shandong UniversityJinan 250061China Shandong Tianqin Mining Machinery Equipment Co. LtdYuncheng 274700China

Automatically formed roadway(AFR)by roof cutting with bolt grouting(RCBG)is a new deep coal mining *** using this technology,the broken roadway roof is strengthened,and roof cutting is applied to cut off stress transfer between the roadway and gob to ensure the collapse of the overlying *** roadway is automatically formed owing to the broken expansion characteristics of the collapsed strata and mining *** the Suncun Coal Mine as the engineering background,the control effect of this new technology on roadways was *** compare the law of stress evolution and the surrounding rock control mechanisms between AFR and traditional gob-side entry driving,a comparative study of geomechanical model tests on the above methods was carried *** results showed that the new technology of AFR by RCBG effectively reduced the stress concentration of the roadway compared with gob-side entry *** side abutment pressure peak of the solid coal side was reduced by 24.3%,which showed an obvious pressure-releasing ***,the position of the side abutment pressure peak was far from the solid coal side,making it more beneficial for roadway *** deformation of AFR surrounding rock was also smaller than the deformation of the gob-side entry driving by the overload *** former was more beneficial for roadway stability than the latter under higher stress *** application tests showed that the new technology can effectively control roadway ***,the technology reduced roadway excavation and avoided resource waste caused by reserved coal pillars.

关键词： Automatically formed roadway Roof cutting Bolt grouting Roadway control Model test

A New Method of Modeling Shield Tunnel in Mixed Strata Based on FISH Language

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A New Method of Modeling Shield Tunnel in Mixed Strata Based...

geomechanics model test research on large deformation control mechanism of roadway disturbed by strong dynamic pressure

作者： Yuefeng Qiu Jian Chen Shun Yi State Key Laboratory of geomechanics and geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of Sciences University of Chinese Academy of Sciences Hubei Key Laboratory of geo-Environmental Engineering The Soft Soil Research center in Ningbo University of Technology State Key Laboratory of Geomechanics and Geotechnical Engineering

In order to solve the problem specific to modeling shield tunnel in mixed strata with FLAC3 D,a new method based on FISH language is *** means of the new proposed method,the shield tunnel as well as the stratum inside and outside the tunnel are precisely modeled in FLAC3 *** with the traditional way,the new method in the paper is both convenient and *** the new method is proved to be reasonable through the numerical result of an ***,the new method in the paper can be applied to further numerical analysis in FLAC3 D.

关键词： shield tunnel mixed strata FISH language FLAC3D

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geohazard mechanics 2023年第2期1卷 140-152页

作者： Qi Wang Yuncai Wang Bei Jiang Zhenhua Jiang Haojie Xue State Key Laboratory for geo-mechanics and Deep Underground Engineering China University of Mining&Technology-BeijingBeijing100083China Research center of geotechnical and Structural Engineering Shandong UniversityJinan250061China

Comprehensive mechanized top-coal caving mining is one of the efficient mining methods in coal ***,the goaf formed by comprehensive mechanized top-coal caving mining is high,and the goaf roof collapse will cause strong dynamic pressure disturbance,especially the collapse of thick hard *** dynamic pressure disturbance has an influence on the stability of the roadway,which can lead to large *** order to solve the above problem,a comprehensive pressure releasing and constant resistance energy absorbing control method is *** pressure releasing can change the roadway roof structure and cut off the stress transfer between goaf and roadway,which can improve the stress environment of the *** constant resistance energy absorbing(CREA)anchor cable can absorb the energy of surrounding rock deformation and resist the impact load of gangue collapse,so as to ensure the stability of roadway disturbed by strong dynamic pressure.A three-dimensional geomechanics model test is carried out,based on the roadway disturbed by strong dynamic pressure of the extra-large coal mine in western China,to verify the control effect of the new control *** stress and displacement evolution laws of the roadway with traditional control method and new control method are *** pressure releasing and energy absorbing control mechanism of the new control method is *** geomechanics model test results show that the new control method can increase the range of low stress zone by 150%and reduce the average stress and the displacement by 34.7%and 67.8%respectively,compared with the traditional control *** filed application results show that the new control method can reduce the roadway surrounding rock displacement by 67.4%compared with the traditional control *** shows that the new control method can effectively control the displacement of the roadway disturbed by strong dynamic pressure and ensure that the roadway me

关键词： Comprehensive mechanized top-coal caving mining Strong dynamic pressure Thick hard roof geomechanics model test Pressure releasing and energy absorbing mechanism

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恒阻吸能材料及锚固体力学特性研究与应用

Journal of Central South University 2023年第10期30卷 3361-3373页

作者：王琦辛忠欣江贝王鸣子何满潮魏华勇 State Key Laboratory for geo-mechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China geotechnical and Structural Engineering Research center Shandong UniversityJi’nan 250061China

锚固支护作为地下工程围岩控制的主体,与围岩联合承载形成锚固体,共同抵抗动力灾害释放的能量。传统锚杆(索)支护强度、延伸率不足,在抵抗动力灾害时易破断失效。恒阻吸能材料是一种具有高强、高延伸的新型支护材料。为明确恒阻吸能新... 详细信息

锚固支护作为地下工程围岩控制的主体,与围岩联合承载形成锚固体,共同抵抗动力灾害释放的能量。传统锚杆(索)支护强度、延伸率不足,在抵抗动力灾害时易破断失效。恒阻吸能材料是一种具有高强、高延伸的新型支护材料。为明确恒阻吸能新材料及其锚固体的力学特性,本文开展了恒阻吸能支护材料与现场常用支护材料MG335、MG500的静力拉伸与动力冲击试验。在此基础上,对MG335、MG500与恒阻吸能支护材料锚固下的岩体开展了霍普金森冲击对比试验,研究了高速冲击下锚固体的变形破坏特征。相比于MG335、MG500锚固体,通过霍普金森冲击试验得到恒阻汲能锚固体的峰值应力提高了42.2%与63.9%,所能吸收的动力冲击能量提高了42.0%与63.2%。恒阻吸能支护技术能够增强锚固体的抗冲承载能力与吸能能力。结合上述试验成果,提出了强扰动下围岩恒阻吸能支护的工程建议,并在千米冲击地压矿井中应用。

关键词：恒阻吸能锚固岩体力学性能试验研究现场应用

Debris flow simulation 2D(DFS 2D):Numerical modelling of debris flows and calibration of friction parameters

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Journal of rock mechanics and geotechnical Engineering 2022年第6期14卷 1747-1760页

作者： Minu Treesa Abraham Neelima Satyam Biswajeet Pradhan Hongling Tian Department of Civil Engineering Indian Institute of Technology IndoreIndoreIndia Centre for Advanced Modelling and geospatial Information Systems(CAMGIS) School of Civil and Environmental EngineeringFaculty of Engineering and Information TechnologyUniversity of Technology SydneySydneyAustralia center of Excellence for Climate Change Research King Abdulaziz UniversityJeddahSaudi Arabia Earth Observation Centre Institute of Climate ChangeUniversity Kebangsaan MalaysiaBangiMalaysia Key Laboratory of Mountain hazards and Surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengduChina

Debris flows are rapid mass movements with a mixture of rock,soil and ***-intensity rainfall events have triggered multiple debris flows around the globe,making it an important concern from the disaster management *** study presents a numerical model called debris flow simulation 2D(DFS 2D)and applicability of the proposed model is investigated through the values of the model parameters used for the reproduction of an occurred debris flow at Yindongzi gully in China on 13 August *** model can be used to simulate debris flows using three different rheologies and has a userfriendly interface for providing the *** DFS 2D,flow parameters can be estimated with respect to space and *** values of the flow resistance parameters of model,dry-Coulomb and turbulent friction,were calibrated through the back analysis and the values obtained are 0.1 and 1000 m/s^(2),*** new methods of calibration are proposed in this study,considering the crosssectional area of flow and topographical changes induced by the debris *** proposed methods of calibration provide an effective solution to the cumulative errors induced by coarse-resolution digital elevation models(DEMs)in numerical modelling of debris *** statistical indices such as Willmott's index of agreement,mean-absolute-error,and normalized-root-mean-square-error of the calibrated model are 0.5,1.02 and 1.44,*** comparison between simulated and observed values of topographic changes indicates that DFS 2D provides satisfactory results and can be used for dynamic modelling of debris flows.

关键词： Debris flows Numerical model Rheology Debris flow simulation 2D(DFS 2D)

Insights into some large-scale landslides in southeastern margin of Qinghai-Tibet Plateau

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Journal of rock mechanics and geotechnical Engineering 2023年第8期15卷 1960-1985页

作者： Bo Zhao Lijun Su Yunsheng Wang Weile Li Lijuan Wang Key Laboratory of Mountain hazards and Earth Surface Processes Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu610041China China-Pakistan Joint Research center on Earth Sciences IslamabadPakistan University of Chinese Academy of Sciences Beijing100049China State Key Laboratory of geohazard Prevention and geoenvironment Protection Chengdu University of TechnologyChengdu610059China Sichuan Academy of Safety Science and Technology Chengdu610045China Major Hazard Measurement and Control Key Laboratory of Sichuan Province Chengdu610045China

The southeastern margin of Qinghai-Tibet Plateau(SMQTP)is of a typical large landslide-prone area due to intense tectonic activity,deeply incised valleys,high geostress and frequent *** gain insights into large landslides in southeastern margin of Qinghai-Tibet Plateau,an area covering 3.34×105 km2 that extends 80e150 km on both sides of the Sichuan-Tibet traffic corridors(G318)was used to examine the spatial distribution and corresponding characteristics of *** results showed that the study area contains at least 629 large landslides that are mainly concentrated on 7 zones(zones IeVII).Zones IeVII are in the southern section of the Longmenshan fault zone(with no large river)and sections with Dadu River,Jinsha River,Lancang River,Nujiang River and Yarlung Zangbo *** are more landslides in the Jinsha River section(totaling 186 landslides)than the other *** to the updated Varnes classification,408 large landslides(64.9%)were recognized and divided into 4 major types,***(275 cases),slides(58 cases),topples(44 cases)and slope deformations(31 cases).Flows,which consist of rock avalanches and iceerock avalanches,are the most common landslide *** landslide triggers(178 events,28.3%)are also recognized,and earthquakes may be the most common *** to the limited data,these landslide type classifications and landslide triggers are perhaps immature,and further systematic analysis is needed.

关键词： Southeastern margin of Qinghai-Tibet Plateau Large landslides Landslide types Landslide triggers Landslide concentration zones