Experiment research on damage mechanism and acoustic emission characteristics of rock mass with prefabricated joints under unloading condition

被引：1

作者：

Cao, Jisheng ^{[1
,2
,3
]}

Dai, Qianwei ^{[1
,2
]}

Ma, Depeng ^{[4
]}

机构：

[1] School of Geosciences and Info-Physics, Central South University, Changsha,410083, China

[2] Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education, Central South University, Changsha,410083, China

[3] Chongqing Research Institute of China Coal Technology and Engineering Group Corporation, Chongqing,400037, China

[4] School of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai'an,271018, China

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2018年 / 49卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Acoustic emission testing - Stresses - Drops - Rock mechanics - Rocks;

D O I：

10.11817/j.issn.1672-7207.2018.06.020

中图分类号：

学科分类号：

摘要：

Considering that the unloading experiment can truely reflect the mechanical behavior of rock mass, the triaxial loading and unloading test of rock mass containing precast jointed was carried out. The results show that the destruction of the jointed rock mass is not a one-off damage compared with intact rock specimens, there is an obvious stress drop phenomenon in the process of test, and its brittle characteristic is not obvious. The ultimate strength of jointed rock is significantly less than that of the intact rock specimens, the average decrease of peak intensity of the intact rock and jointed rock in unloading test are 9.13% and 18.81%, respectively, compared with the normal triaxial strength, which suggests that the damage of jointed rock occurs more often under unloading test. Jointed rock has many times of stress drop phenomenon in the rupture process, acoustic emission ringing count rate would abruptly increase in every time that stress drop occurs. In addition, the damage degree of jointed rock is weak compared with intact rock in unloading tests. © 2018, Central South University Press. All right reserved.

引用

页码：1465 / 1471