含预制裂纹的脆性岩石单轴压缩下渐进性破坏过程的试验研究

对含预制裂纹的花岗岩进行单轴压缩试验研究预制裂纹倾角α对脆性岩石渐进性破坏过程的影响。首先埘破坏过程的轴向应力-横向应变曲线进行总结和讨论，然后分析预制裂纹与加载方向夹角α埘岩石的应应力门槛值：裂纹起始应力σci、裂纹扩展应力σed、峰值强度矿σf，由应变片记录的应力-应变曲线和试样的表嘶裂纹扩展情况的影响机制。结果表明，含有预制裂纹的岩石试样进行加载试验过程中，顶制裂纹倾角α的变化成了决定脆性岩石破裂办式的主要因素。故在对含节理、裂隙的脆性岩石的工程应用上，通过对岩休的轴向应力-横向应变向应变典线进行分析，可以对地下开挖工程起到指导设计开挖方式及支护形式的作用。

Experimental Study on Progressive Failure Process of Brittle Rock with Pre-existing Flaw Based on Uniaxial Compression

A series of uniaxial compression experiment on the granite with the pre-existing flaw were carried out to study the influence of the inclining angle α of the pre-existing flaw on the progressive failure of brittle rock. The paper firstly summa- rized and discussed the axial stress-radial strain curves of progressive failure process, then analyzed the stress thresholds af- fected by pre-existing flaw and inclining angle α crack initiation stress σci, crack damage stress σed, peak strength σf ; stress-strain curves recorded by the strain gauges and the influence mechanism of surface flaw propagation of rock speci- men. The experimental results show that in the loading test process of rock specimen with pre-existing flaw, the difference of inclining angle σ is the main factor affecting the rupture pattern of brittle rock. So in the engineering applications of brit- tle rock with joint and fracture, the analysis on axial stress-radial strain curves can play the guiding role for the designs of underground excavation method and support form.