文献类型：期刊文章

作　　者：杜坤[1] 李夕兵[2] 李地元[2] 翁磊[2]

机构地区：[1]中南大学高等研究中心,长沙410083 [2]中南大学资源与安全工程学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》

基　　金：Project(2010CB732004)supported by the National Basic Research Program of China;Projects(50934006,11102239)supported by the National Natural Science Foundation of China

年　　份：2015

卷　　号：25

期　　号：2

起止页码：571-581

语　　种：中文

收录情况：AJ、CAS、CSA、CSA-PROQEUST、CSCD、CSCD2015_2016、EBSCO、EI、IC、INSPEC、JST、SCI(收录号：WOS:000349766300028)、SCI-EXPANDED(收录号：WOS:000349766300028)、SCIE、SCOPUS、WOS、ZGKJHX、普通刊

摘　　要：Slabbing failure often occurs in the surround rock near a deep underground excavation. The mechanism of slabbing failure is still unclear. In order to reveal the influence of the intermediate principal stress （σ2） on slabbing failure, true triaxial unloading compressive test was carried out based on the stress path of the underground engineering excavation, i.e., unloading the minimum principal stress （σ3）, keeping σ2, increasing the maximum principal stress （σ1）. The initiation and the propagation of slabbing fracture in rock specimens were identified by examining the acoustic emission （AE） and the infrared radiation characterization. The test results show that the failure modes of the granite and red sandstone specimens are changed from shear to slabbing with the increase of σ2. The AE characteristic of rock specimen under low σ2 is swarm type which is the main shock type under high σ2. The infrared radiation properties of rock specimen under different σ2 are also different. The temperature change area is just along the shear fracture such as the uniaxial compression. With the increase of σ2, the temperature change area is planar of rock specimen which proofs that the failure mode of rock specimen turns into slabbing.

关 键 词：true triaxial stress  UNLOADING slabbing  acoustic emission  infrared radiation  

分 类 号：TD31]