中文摘要：

对赵固一矿粗砂岩进行试验,获得力学参数,利用颗粒流程序获得粗砂岩的细观力学参数,研究不同围压下粗砂岩的变形、强度和损伤特性。获得以下主要结论：随着围压增加,粗砂岩弹性模量略有增加,峰值强度提高,屈服阶段变长,残余强度提高,脆性降低,延性增强;主应力表示的强度准则二次抛物线型比直线型更加贴近试验结果,并建议单轴强度不参与拟合作为一个特别指标给出;粗砂岩的体变经历线性体缩、线性扩容和非线性扩容阶段,扩容起始点随围压增加,对应的轴向应变增大;随着围压增加,粗砂岩破坏时损伤区域增多且分布趋于均匀化,主控裂隙增多,贯通性增强,岩体被切割的块数增加,裂隙面附近岩体呈现压碎性破坏状态。

英文摘要：

Mechanical parameters were achieved by tests on a gritstone in Zhaoguyi Coal Mine.Particle Flow Code（PFC）was used to obtain the meso-mechanical parameters,so as to study on the deformation,strength and damage property of gritstone under different confining pressures.Main research results were concluded as follows.Firstly,with the increase of confining pressure,the elastic modulus of gritstone increased slightly,the peak strength raised,the yield stage lengthened,the residual strength increased,and the brittleness decreased while ductility enhanced.Secondly,quadratic parabola strength criterion expressed the principal stress more close to the experimental results than that of linear,and the uniaxial compression strength was suggested to act as a special index rather than participate in the fitting.Thirdly,gritstone volumetric strain went through linear volumetric reduction,linear expansion and nonlinear expansion stage,and axial strain at expansion starting point enhanced with the increasing of confining pressures.Finally,as the increase of confining pressure,gritstone damage zone grew in quantity with its distribution tending to be uniform,the number and connectivity of main crack enhanced,and the quantity of blocks cut from rock increased,while the rock near main crack presenting crushing failure.