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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。
The coarse sandstone in the No.1 Zhaozigou Mine was tested and the mechanical parameters were obtained. The mesomechanical parameters of the coarse sandstone were obtained by using the particle flow program to study the deformation, strength and damage characteristics of the coarse sandstone under different confining pressures. The main conclusions are as follows: With the increase of confining pressure, the elastic modulus of coarse sandstone slightly increases, the peak strength increases, the yield stage becomes longer, the residual strength increases, the brittleness decreases and the ductility increases. The principal stress indicates the quadratic parabola ratio Straight line is closer to the experimental results and the proposed uniaxial strength is not included in the fitting as a special indicator. The body deformation of the coarse sandstone undergoes linear body contraction, linear expansion and nonlinear expansion. The initial point of expansion increases with the confining pressure. The axial strain increases; with the increase of confining pressure, the damage area increases and distributes homogeneously when the coarse sandstone destructs, the main control fracture increases, the penetrability increases, the number of blocks that the rock mass is cut increases, the rock mass near the fracture surface Showing crushing damage.