高温后大理岩渐进破坏过程试验研究  

Experimental study on the progressive failure of marbles after high temperatures

作　　者：郭清露 Guo Qinglu(Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan Hubei 430072,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430072

出　　处：《山西建筑》2023年第19期78-81,共4页Shanxi Architecture

摘　　要：为分析不同温度作用后岩石渐进破坏过程,对单轴压缩大理岩进行全过程的声发射定位监测,将声发射定位的时空演化规律与大理岩渐进破坏过程的各个阶段结合起来,得到如下结论:从声发射定位点的分布和数目可以判定岩样破裂模式,定位点丛集的区域可以达到宏观裂纹出现的位置;声发射三维空间定位与岩样内部裂纹产生、扩展和汇合有非常好的对应关系,能用来研究岩石渐进破坏过程;经过高温作用后,大理岩热损伤较大,内部裂纹密度变大,声发射定位点的出现与裂纹发展相关。这些结果可以更好地为解决工程实际问题提供借鉴。In order to study the progressive failure of marbles after high temperatures,Acoustic Emission(AE)location monitoring were carried out for uniaxial compression marbles.Then,the spatio-temporal evolution of AE location was combined with each stage of progressive failure process of marbles.The results are as follows:The fracture mode of rock samples can be predicated by the distribution and number of AE location points,and the region of AE location points cluster can reach the location of macroscopic crack.There is a good correspondence between AE three-dimensional spatial positioning and crack generation,propagation and convergence in rock samples,which can be used to study the progressive failure process of rock.After high temperature,the thermal damage of marble is larger,and the internal crack density becomes larger.The occurrence of AE location points is related to the crack development.These results can provide reference for solving practical engineering problems.

关 键 词：高温加热 声发射定位 时空演化 渐进破坏 

分 类 号：TU455[建筑科学—岩土工程]