复杂条件下黏性土主动土压力解析解`

为求得复杂条件下黏性土平面破坏土楔下的主动土压力系数,基于极限平衡理论及Coulomb土压力理论,考虑了挡土墙倾角、填土摩擦角、填土黏聚力、挡土墙背与土界面摩擦角和黏着力、黏性填土表面坡角、黏性土表面裂缝深度对黏性土主动土压力的影响,通过推导得出了以黏性土质量分量、超载分量、黏聚力分量主动土压力系数所表示的黏性土主动土压力计算公式。在特定条件下,本文解与经典的Rankine和Coulomb土压力理论计算结果一致,有较高精度,且既适用于黏性土,也适用于砂土,可应用于实际工程。

Analytical solution of active earth pressure on cohesive soils under complicated conditions

Based on the limit equilibrium theory and Coulomb’s earth pressure theory,the active earth pressure coefficients of soils with planer rupture surfaces under complicated conditions were obtained.The effects of variation in wall batter angles,the soil friction angle,cohesive forces,the interface friction angle and adhesive forces between the retaining wall and soil,ground slope,the tension crack,and continuous surcharge on the active earth pressure coefficients were considered in this study.The unit density,surcharge,and cohesion components were deduced.The calculation result was the same as the results of the classical Rankine and Coulomb’s earth pressures theories under certain conditions.In addition,the results of the proposed method agreed well with the test data.The formula is reliable and convenient,and can be applied to cohesive soil and sandy soil,as well as to practical projects.