摘要
充填裂隙岩体在超前注浆巷道开挖后起主要承载作用。本文通过对开挖过程的数值模拟获得掘进应力路径,分别在常规压缩及掘进应力路径下对含充填裂隙岩石进行加载;同时采用数字图像相关法及声发射设备对岩石破裂过程进行监测。结果表明掘进应力路径对含充填裂隙岩石有三种影响:1)压密;2)裂隙附近的强度异化;3)裂隙尖端形成预裂。压密导致树脂充填试件起裂角减小。裂隙附近强度的异化导致在未充填试件裂隙靠近长边的区域拉伸和压缩变形交替出现,水泥充填试件由突然变形转为渐进变形,树脂充填试件则相反。预裂减弱了未充填试件的强度,改变了水泥充填试件剪切裂纹的传播方向。
Rock masses with filled flaws play the main bearing role after excavation of pre-grouting roadway. In this study, the excavation stress path was obtained by numerical simulation, and rocks with filled flaws were loaded under the conventional compression and excavation stress path respectively. The failure process was simultaneously monitored by digital image correlation method and acoustic emission equipment. The results showed that the three simultaneous changes were caused by the excavation stress path: 1) compaction;2) non-uniform change in strength near the flaws;3)pre-cracking occurs at the flaw tip. Compaction decreased the crack initiation angle of resin-filled specimens. Variations in strength near the flaw resulted in the alternate appearance of tensile and compressive deformation in unfilled specimens near the long side of the flaw. The deformation in cement-filled specimens changed from sudden to progressive, whereas that in resin-filled specimens was the opposite. Pre-cracking weakened the unfilled specimens and changed the propagation direction of shear cracks in cement-filled specimens.
作者
崔家庆
冯国瑞
李竹
韩艳娜
宋诚
CUI Jia-qing;FENG Guo-rui;LI Zhu;HAN Yan-na;SONG Cheng(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Province Research Centre of Green Mining Engineering Technology,Taiyuan 030024,China)
基金
Project(51925402) supported by the Distinguished Youth Funds of the National Natural Science Foundation of China
Projects(51904201, 52174125) supported by the National Natural Science Foundation of China
Project(2019L0245) supported by the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi,China
Project(U1710258) supported by the Joint Funds of National Natural Science Foundation of China and Shanxi Province
Project(20201102004) supported by the Shanxi Science and Technology Major Project Funds,China
Project(2021SXTD001) supported by the Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,China
Projects(52004173, 51904203, 51904198) supported by the National Science Foundation for Young Scientists of China。
关键词
掘进应力路径
充填裂隙
注浆
裂隙发展
excavation stress path
filled flaws
grouting
crack propagation
