文献类型：期刊文献

英文题名：Numerical Simulation on Shear Behavior of Double Rough Parallel Joints Under Constant Normal Stiffness Boundary Condition

作者：Liu, Jie[1,2];Wu, Jiahong[1,2];Li, Xiaoshuang[1,2];Zhang, He[1,2];Song, Yanbin[1,2]

机构：[1]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing, Peoples R China;[2]Shaoxing Univ, Sch Civil Engn, Shaoxing, Peoples R China

年份：2022

卷号：9

外文期刊名：FRONTIERS IN EARTH SCIENCE

收录：SCI-EXPANDED(收录号：WOS:000760656600001)、、Scopus(收录号：2-s2.0-85125044412)、WOS

基金：Funding This study was supported by the National Natural Science Foundation of China (nos. 41867033, 41702327, and 52179112) and the Zhejiang Collaborative Innovation Center for Prevention and Control of Mountain Geological Hazards (no. PCMGH-2017-Y-04).

语种：英文

外文关键词：UDEC; double rough parallel joints; constant normal stiffness; roughness; joint spacing

外文摘要：The shear characteristics of rock joints under constant normal stiffness (CNS) boundary condition are critical to the stability of underground engineering rock mass. Five different rock joint profiles with random morphology were constructed using the independent segmentation method of the Hurst exponent. Based on the continuously yielding joint model, the discrete element calculation models of double rough parallel joints with different joint surface roughness and spacing of joints under CNS boundary condition were established using UDEC software to investigate the shear effect of joints under CNS boundary condition. The results show that under CNS boundary condition, the shear stress, normal displacement, normal stress, and surface resistance index (SRI) all increase with the increase of joint surface roughness coefficient (JRC) for both single- and double-joint specimens, and these of the single-joint are greater than these of the double-joint. With the increase of the joint spacing d, the peak shear stress tau(y), and the peak surface resistance index (SRIp) show a gradually increasing trend, and the influence of d on tau(y) and SRIp is greater with the increase of JRC, and both tau(y) and SRIp show a linear increasing trend with the increase of JRC. With the increase of d for the same JRC, both normal displacement and normal stress show a gradually increasing trend, and also, the increased amplitudes gradually increase; with the increase of JRC for the same d, the two parameters also show an increasing trend.