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Frictional sliding of infilled planar granite fracture under oscillating normal stress

International Journal of Mining Science and Technology 2023年第6期33卷 687-701页

作者： Kang Tao Wengang Dang Yingchun Li School of Civil Engineering Sun Yat-sen UniversityZhuhai 519086China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou 221116China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519086China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

This paper investigates the frictional behavior of the infilled rock fracture under dynamic normal stress.A series of direct shear tests were conducted on saw-cut granite fractures infilled with quartz using a selfdeveloped dynamic shear apparatus,and the effects of normal load oscillation amplitude,normal load oscillation period and sliding velocity were *** test results reveal that the shear response can be divided into three stages over a whole loading-unloading process,characterized by different time spans and stress ***,a smaller oscillation amplitude,a longer oscillation period and a fast shear velocity promote the stability of the friction system,which is also confirmed by the Coulomb failure criterion calculated based on the observed periodic apparent friction *** dynamic strengthening/weakening phenomenon is dependent on the oscillation amplitude and product of sliding velocity and oscillation period(vT).Also,the rate and state friction law incorporating the parameter a that characterizes the normal stress variation is employed to describe the dynamic friction coefficient but exhibits an incompetent performance when handling intensive variation in normal ***,the potential seismicity induced by oscillating normal stress based on the observed stress drop is *** work helps us understand the sliding process and stability evolution of natural faults,and its benefits for relative hazard mitigation.

关键词： granite fracture Quartz gouge Normal load oscillation Frictional stability Rate and state friction law

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Prediction on contaminant migration in aquifer of fractured granite substrata of landfill

引用

Journal of Central South University 2013年第11期20卷 3193-3201页

作者：汪洋张可能陈永贵周星志金福喜 Key Laboratory of Metallogenic Prediction of Nonferrous Metals Ministry of Education(School of Geosciences and Info-PhysicsCentral South University) School of Civil Engineering and Architecture Changsha University of Science and Technology

Nowadays,a certain amount of landfills in China were constructed without horizontal liner *** research conducted focuses mainly on the contaminants from landfill leachate migrating in the aquifer of a fractured granite area,and pollution predictions for groundwater were made by establishing numerical model with Visual Modflow combining field investigation like geological surveys,drilling,geophysical explorations,hydrogeological experiments,water quality *** transportation of the chloride ion from landfill in the aquifer was simulated in the model with time frames of 2 555,3 650,5 475 and7 300 *** model shows that from 2 555 d to 7 300 d starting from 2003,the chloride ion migrated from 900 m to 1 300 m,respectively,along the groundwater *** results indicate that as leachate plume migrated in the aquifer,the concentration of the pollutants can be up to 19.74 to 251.76 times that of background *** research proves that the leachate poses a threat to the local water body and offers a reference towards groundwater pollution prevention for fractured granite landfill sites.

关键词： landfill contaminant migration leachate granite fracture Modflow

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