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为研究孔隙含水岩石的水平侧压力系数与孔隙率、孔隙几何参数与孔隙压力的关系,分别采用外接圆半径相等的正三角形、正四边形和圆形孔隙的随机孔隙模型对上述问题进行数值分析研究。按岩石与衬砌接触面处理与否,模型简化为侧边界有孔隙和侧边界无孔隙2类。结果表明:当岩石中无孔隙压力时,2类模型的水平侧压力系数均随孔隙率增加而减小,孔隙率相等时,水平侧压力系数随孔隙的边长/面积比的增大而减小;当岩石中作用有孔隙压力时,2类模型的水平侧压力系数均随孔隙压力增加而线性增大,孔隙率越大,侧压力系数增加越显著;当孔隙形状、孔隙率和孔隙压力相同时,与侧边界不含孔隙的岩石相比,侧边界含孔隙的岩石水平侧压力系数更大;相同孔隙率与孔隙压力情况下,孔隙岩石的水平侧压力系数随孔隙边长/面积比的增加而增大。
In order to study the relationship between the horizontal lateral pressure coefficient and the porosity, the geometrical parameters of pore and the pore pressure of water-bearing rock, the numerical analysis of the above-mentioned problems were conducted by using the random pore model of equilateral triangle, quadrilateral and circular with equal circumscribed circle, . According to rock or lining contact surface treatment or not, the model is simplified to the side of the boundary with no porosity and side boundary 2 categories. The results show that the horizontal pressure coefficient of the two models decreases with the increase of the porosity when the pore-free pressure is in the rock. When the porosity is equal, the pressure coefficient at the horizontal side decreases with the increase of the side length / area ratio of the pores When the pore pressure is acting on the rock, the horizontal pressure coefficient of the two models increases linearly with the increase of pore pressure. The larger the porosity, the more significant the lateral pressure coefficient increases. When the pore shape, porosity and pore pressure At the same time, the horizontal lateral pressure coefficient of pore-containing rock in lateral boundary is larger than that of the rock without lateral boundary in the lateral boundary. Under the same porosity and pore pressure, the horizontal lateral pressure coefficient of pore rock increases with the length / Increase and increase.