裂隙对非贯通裂隙介质强度与变形特性影响的研究

Crack's influence on mechanical properties of the intermittent crack media

采用类岩石材料水泥砂浆,制作成含有不同裂隙倾角和不同裂隙数目的非贯通裂隙模型试样,在岩石三轴、剪切复合机上进行单轴压缩试验研究,分析非贯通裂隙试件在单轴压缩条件下的破坏方式、变形和强度特性,并建立了其与非贯通裂隙倾角和裂隙数目的关系;加载的同时利用超声波检测仪进行声波测试,分析了其内部裂纹的扩展情况。试验结果表明,裂隙的存在使试件强度显著降低;试件中有无裂隙对其强度的影响明显大于裂隙角度的影响;试件强度一般随裂隙数量的增加而降低,但也与裂隙的位置有关;裂隙角度对强度的影响有随裂隙数量增加而减小的趋势。

In this paper, rock-like material samples with different obliquity and number of intermittent cracks are tested on MTS and sound wave testing devices. And systematic researches on failure pattern,deformation and strength characteristics under axial compressive condition for the intermittent crack samples are analyzed. The relationship among failure pattern, deformation, strength and obliquity, and the number of intermittent cracks is further obtained. The conclusion are as follows.the cracks reduce intensity of the samples observably;the influence of the crack on the intensity is more obvious than on the crack angle;the intensity of the sample reduces with the increase of the cracks and also related to the position of crack;the influence of the crack angle on the intensity tends to decrease as the cracks increase.