论文部分内容阅读
随着土层的不断压缩,土的孔隙度不断减小,土的渗透系数、贮水率会随之发生变化。根据贮水率定义得出其表达式,结合固结试验中孔隙比与有效应力的关系,推导出贮水率与孔隙比的表达式。从理论分析得出:当地面发生沉降变形,含水层的孔隙比减小,贮水率变小;当地面发生回弹变形,含水层的孔隙比变大,贮水率变大。建立了室内试验平台,通过增加和减少含水层上覆荷载来模拟含水层的沉降和回弹,并研究了含水层沉降和回弹时贮水率的变化,得到了和理论分析相同的结果。
With the continuous compression of soil, soil porosity decreases, soil permeability coefficient, water storage rate will change. According to the definition of water storage, the expression is derived. Based on the relationship between void ratio and effective stress in consolidation test, the expression of water storage ratio and void ratio is deduced. The theoretical analysis shows that when the ground surface deformation occurs, the void ratio of the aquifer decreases, and the water storage rate becomes smaller. When the ground rebounds, the void ratio of the aquifer becomes larger and the water storage rate becomes larger. An indoor test platform was established to simulate the settlement and springback of the aquifer by increasing and decreasing the overburden of the aquifer. The changes of the water storage rate during the settlement and springback of the aquifer were also studied. The same results as the theoretical analysis were obtained.