【摘要】 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。首先对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对岩石的应力门槛值:裂纹起始应力σci、裂纹扩展应力σcd、峰值强度σf,由应变片记录的应力-应变曲线和试样的表面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,预制裂纹倾角α的变化成了决定脆性岩石破裂方式的主要因素。故在对含节理、裂隙的脆性岩石的工程应用上,通过对岩体的轴向应力-横向应变曲线进行分析,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。更多还原

【Abstract】 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 summarized and discussed the axial stress-radial strain curves of progressive failure process,then analyzed the stress thresholds affected by pre-existing flaw and inclining angle α crack initiation stress σci,crack damage stress σcd,peak strength σf;stress-strain curves recorded by the strain gauges and the influence mechanism of surface flaw propagation of rock specimen.The experimental results show that in the loading test process of rock specimen with pre-existing flaw,the difference of inclining angle α is the main factor affecting the rupture pattern of brittle rock.So in the engineering applications of brittle 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.更多还原