中南大学学报（自然科学版）2018，Vol.49Issue(6)：1474-1480,7.DOI:10.11817/j.issn.1672-7207.2018.06.020
预制节理岩体卸荷损伤破坏机理及声发射特征试验研究
Experiment research on damage mechanism and acoustic emission characteristics of rock mass with prefabricated joints under unloading condition
摘要
Abstract
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.关键词
节理岩体/卸荷/应力-应变/声发射/力学试验Key words
jointed rock mass/unloading/stress-strain/acoustic emission/mechanical test分类
矿业与冶金引用本文复制引用
曹吉胜,戴前伟,马德鹏..预制节理岩体卸荷损伤破坏机理及声发射特征试验研究[J].中南大学学报（自然科学版）,2018,49(6):1474-1480,7.基金项目
国家自然科学基金资助项目(41374118) （41374118）
重庆市教委科技计划项目(KJ1732439)(Project(41374118) supported by the National Natural Science Foundation of China （KJ1732439）
Project(KJ1732439) supported by the Chongqing City Board of Education Committee) （KJ1732439）
