文献类型：期刊文献

英文题名：Permeability evolution of grout infilled fractures subjected to triaxial compression with low confining pressure

作者：Zhou, Dong[1,2];Zhao, Zhihong[2];Li, Bo[3];Chen, Yuedu[2];Ding, Wenqi[1]

机构：[1]Tongji Univ, Dept Geotech Engn, Shanghai, Peoples R China;[2]Tsinghua Univ, Dept Civil Engn, Beijing, Peoples R China;[3]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing, Zhejiang, Peoples R China

年份：2020

卷号：104

外文期刊名：TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000567710800003)、、EI(收录号：20203109001859)、Scopus(收录号：2-s2.0-85088740767)、WOS

基金：This study is supported by the National Key R&D Program of China (2018YFC0407005) and National Natural Science Foundation of China (Grant No. 51779123, 51739006). Mr. Shuming Zhou from Beijing Urban Construction Design & Development Group Co., Limited and Dr. Delei Shang and Mr. Huan Peng and are thanked for providing photos and schematic diagrams. Mr. Linxiang Wang and Mr. Tongyang Zhao from Shaoxing University and Mr. Zihao Dou from Tsing University are thanked for performing the triaxial compression tests and CT scanning. The constructive comments from the Editor-in-Chief Dr. Qianbing Zhang and the two anonymous reviewers are thanked.

语种：英文

外文关键词：Infilled fracture; Grout; Permeability; Triaxial compression; DEM

外文摘要：Fractures in rock masses not only are main flow conduit for groundwater, but also provide planes of weakness on which further displacement can more readily occur. Grouting has been widely used to reduce the permeability of fractured rocks, as well as to improve the stability of fractured rocks. Therefore, fractures infilled with grout appear extensively in practice, and may be subjected to different in-situ stress conditions during the construction and operation life of tunnels and underground spaces in fractured rock masses. To examine the stress induced changes in permeability of grout infilled fractures, we performed triaxial compression tests on fractured granite samples infilled with grout, during which continuous permeability measurements were also conducted. Both planar and rough fractures with different apertures were tested. The permeability of infilled fractures slightly decreased with increasing deviatoric stress from 0 to the crack damage stress, followed by drastic enhancement in permeability with further increasing deviatoric stress. The fracture permeability increased by about 5-10 times at the peak deviatoric stress compared with that at the deviatoric stress of 5 MPa. Both CT techniques and particle discrete element models were used to investigate the changes in the microstructures of grouts and granites, as well as the interface between them. The results show that compression induced cracks in grouts and grout-granite interfaces are the main sources for the enhancements in permeability of grout infilled fractures under triaxial compression with low confining pressures.