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ground response and failure mechanism of gob-side entry by roof cutting with hard main roof

Journal of Central South University 2024年第7期31卷 2488-2512页

作者： ZHU Heng-zhong XU Lei WEN Zhi-jie State Key Laboratory of Water Resource Protection and Utilization in Coal Mining Beijing 102209China State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266590China School of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China School of Civil Engineering Henan Polytechnic UniversityJiaozuo 454003China School of Mining Guizhou UniversityGuiyang 550025China

This study is the result of long-term efforts of the authors’team to assess ground response of gob-side entry by roof cutting(GSERC)with hard main roof,aiming at scientific control for GSERC deformation.A comprehensive field measurement program was conducted to determine entry deformation,roof fracture zone,and anchor bolt(cable)*** results indicate that GSERC deformation presents asymmetric *** maximum convergence near roof cutting side is 458 mm during the primary use process and 1120 mm during the secondary reuse *** entry deformation is closely associated with the primary development stage,primary use stage,and secondary reuse *** key block movement of roof cutting structure,a complex stress environment,and a mismatch in the supporting design scheme are the failure mechanism of GSERC.A controlling ideology for mining states,including regional and stage divisions,was *** dynamic and permanent support schemes have been implemented in the *** practice results indicate that the new support scheme can efficiently ensure long-term entry safety and could be a reliable approach for other engineering practices.

关键词： gob-side entry by roof cutting ground response failure mechanism following mining states control hard main roof

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ground motion amplification pattern with TBM tunnels crossing soil-rock interface:Shaking table test

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Underground Space 2023年第5期12卷 202-217页

作者： Siming Li Roberto Cudmani Mingqing Xiao Zhiming Guo Yong Yuan College of Civil Engineering Tongji UniversityShanghai 200092China Department of Civil and Environmental Engineering Technical University of MunichMu¨nchen 81245Germany China Railway Siyuan Survey and Design Group Co. Ltd.Wuhan 430063China Public Works Construction Center Nanjing 210019China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China

The current aseismic design has seldom considered the effect caused by underlain *** studies focused on the scenarios of tunnels embedded in homogeneous soil under transverse seismic *** paper aims to investigate the tunnel effect on the surface acceleration response in soil-rock strata by shaking table *** sets of excitations are employed and input along the shaking table in both transverse and longitudinal *** soil-rock site is classified as four micro-zones with varying conditions,to mount observation stations of acceleration *** characteristics of the four zones are identified by the transfer function(TF)method,and the tunnel effect on the ground acceleration response is obtained by comparing the spectral acceleration results between the free-field and ground-tunnel *** test results indicate that the tunnel effect varies with the site ***,a significant amplification effect is observed at the A4 zone,located on the soil deposit near the soil-rock ***,it is proved that the scattering waves generated at the interface and the standing waves trapped between the tunnel and upper ground surface account for the amplification,revealed by the discrepancies of the TF results and acceleration details between the free-field and ground-tunnel models.

关键词： Tunnel Soil-rock interface Seismic excitation ground response Site characteristics

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Dynamic equivalent soil characteristics identification using earthquake records

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Earthquake Science 2018年第3期31卷 166-173页

作者： Asskar Janalizadeh Choobbasti Saman Soleimani Kutanaei Department of Civil Engineering Babol University of Technology

Techniques for soil property estimation can be categorized into two main groups, in-situ and laboratory methods. Previous investigations indicated that strong ground motions record provides a very useful tool to estimating the in-situ characteristics of soil. The main objective of the present work is to utilize the particle swarm optimization algorithm（PSOA） integrated with linear site response method to obtain the equivalent soil profile characteristics from the available surface and bedrock earthquake motion records. To demonstrate the numerical efficiency and the validity of this approach, the procedure is validated against an available case. Then this procedure is utilized to identify the soil properties profiles of the site by using strong ground motions data recorded during the Bam earthquake of December 26, 2003. The magnitude and PGA of Bam earthquake were MW 6.6 and 0.8 g respectively.

关键词： identification ground response particle swarm optimization algorithm site effect

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Seismological Research in Singapore

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Earthquake Research in China 2002年第3期16卷 243-252页

作者： Mah King Kheong Lim Lay Eng Meteorological Service Singapore Meteorological Service Singapore P.O. Box 8 Changl Airport Singapore P.O. Box 8 Changl Airport Singapore

The Singapore seismic network and the seismicity of Singapore are briefly described, the four tremor events experienced by Singapore are discussed and the ground responses of different stations are compared. The tremo... 详细信息

关键词： Singapore seismic network Tremor ground response

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