A testing system to understand rock fracturing processes induced by different dynamic disturbances under true triaxial compression  

作　　者：Xia-Ting Feng Mian Tian Chengxiang Yang Benguo He 

机构地区：[1]Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Northeastern University,Shenyang,110819,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2023年第1期102-118,共17页岩石力学与岩土工程学报（英文版）

基　　金：This study was financially supported by the National Natural Science Foundation of China(Grant No.51839003),for which we are grateful.

摘　　要：In this context,a testing system to understand rock fracturing processes induced by different dynamic disturbances under true triaxial compression was developed.The system is mainly composed of a static loading subsystem,a dynamic loading subsystem,a specimen box subsystem,and a data measurement subsystem.The static loading subsystem uses low stiffness loss frame structure technology,which greatly improves the frame stiffness in the three principal stress directions(up to 20 GN/m)and ensures the demand of the disturbance experiment in both the prepeak and postpeak stages.The disturbance loads with frequency of 0e20 Hz and stress level of 0e30 MPa were applied using large flow parallel oil source technology characterized with high heat dissipation efficiency.For the disturbance loads with frequency of 100e500 Hz and stress level of 0e30 MPa,they were realized by using high-frequency and centimeter-per-second-scale low-speed disturbance rod technology.Three rigid self-stabilizing specimen boxes were utilized to provide support for the specimen and deformation sensors,ensuring the stability and accuracy of the data obtained.To verify the performance of the true triaxial test system,disturbance experiments were conducted on granite specimens.The results show that the experimental device satisfies the requirements of original design,with an excellent repeatability and reliable testing results.

关 键 词：Low-frequency and low-amplitude full surface disturbance True triaxial system Prepeak and postpeak dynamic disturbance Rockburst-induced stress wave Blasting-induced stress wave Hard rock 

分 类 号：P642.22[天文地球—工程地质学]