Effects of pore spacing and pore diameter on mechanical properties of sandstone with uniformly distributed pores
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摘要: 为了研究孔洞间距和孔洞直径对于含均布孔洞岩石变形破坏的影响规律，基于完整砂岩试样和含有预制单一裂隙砂岩试样的室内单轴压缩试验数据，应用离散元颗粒流软件进行模拟，确定一组细观参数，并运用这组细观参数对含均布孔洞砂岩试样开展单轴压缩模拟试验。研究结果表明：当保持孔洞直径不变，随孔洞间距减小，试样的峰值应力、起裂应力和弹性模量均呈减小趋势，试样的破坏形式由剪切破坏逐渐变为劈裂破坏；当保持孔洞间距不变，随孔洞直径增大，试样的峰值应力、起裂应力和弹性模量呈减小趋势，试样破坏形式由劈裂剪切复合破坏转变为剪切破坏；试样加载破坏起于孔洞周围的应力集中，最终由于颗粒黏结断裂导致裂纹的扩展并贯通破坏，且试样的拉伸裂纹明显多于剪切裂纹。Abstract: To study the influence of pore spacing and pore diameter on the deformation and failure of rocks with uniformly distributed pores, a set of microscopic parameters was determined by using the indoor uniaxial compression test data of complete sandstone specimens and sandstone specimens with prefabricated single cracks and discrete element particle flow software simulation, and the uniaxial compression simulation test of sandstone specimens with uniformly distributed pores was carried out based on the microscopic parameters. The research results indicate that when the pore diameter is kept constant, the peak stress, crack initiation stress and elastic modulus of the specimen all show a decreasing trend with the decrease of pore spacing, and the failure form of the specimen changes from shear failure to splitting failure; when the pore spacing is kept constant, the peak stress, crack initiation stress and elastic modulus of the specimen show a decreasing trend with the increase of pore diameter, and the failure form of the specimen changes from splitting shear composite failure to shear failure; the failure of the specimen starts from the stress concentration around the pore, and finally, the cracks extend and penetrate due to the fracture of particle bonding. Notably, the tensile cracks of the specimen are significantly more than the shear cracks.
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表 1 砂岩试样细观参数
参数 取值 颗粒最小半径/mm 0.30 颗粒粒径比 1.60 颗粒密度/ (kg∙m−3) 2449 颗粒接触模量/GPa 9.5 颗粒刚度比 1.2 颗粒摩擦系数 0.9 平行黏结模量/GPa 1.0 平行黏结刚度比 1.2 法向黏结刚度/MPa 60±10 切向黏结刚度/MPa 80±30 
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