A method to model the effect of pre-existing cracks on P-wave velocity in rocks

查看全文 作　　者：Haimeng [1,2]Shen;Xiaying [1,2]Li;Qi [1,2]Li;Haibin [1,2]Wang

机构地区：[1]State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,430071,China;[2]University of Chinese Academy of Sciences,Beijing,100049,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》索引2020年第12卷第3期,共14页

基　　金：partially supported by the National Natural Science Foundation of China(Grant Nos.41872210 and 51674238);the Open Research Fund of the State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences(Grant No.Z017006)。 摘　　要：Crack closure is one of the reasons inducing changes of P-wave velocity of rocks under compression.In this context,a method is proposed to investigate the relationships among P-wave velocity,pre-existing cracks,and confining pressure based on the discrete element method(DEM).Pre-existing open cracks inside the rocks are generated by the initial gap of the flat-joint model.The validity of the method is evaluated by comparing the P-wave velocity tested on a sandstone specimen with numerical result.As the crack size is determined by the diameter of particles,the effects of three factors,i.e.number,aspect ratio,and orientation of cracks on the P-wave velocity are discussed.The results show that P-wave velocity is controlled by the(i.e.number) of open micro-cracks,while the closure pressure is determined by the aspect ratio of crack.The reason accounting for the anisotropy of P-wave velocity is the difference in crack number in measurement paths.Both of the number and aspect ratio of cracks can affect the responses of P-wave velocity to the applied confining pressure.Under confining pressure,the number of open cracks inside rocks will dominate the lowest P-wave velocity,and the P-wave velocity of the rock containing narrower cracks is more sensitive to the confining pressure.In this sense,crack density is difficult to be back-calculated merely by P-wave velocity.The proposed method offers a means to analyze the effect of pre-existing cracks on P-wave velocity. 关键词：Pre-existing cracks P-wave velocity Discrete element method(DEM) Anisotropic rock

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A method to model the effect of pre-existing cracks on P-wave velocity in rocks

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