考虑位移效应的土压力计算理论

基于朗肯土压力理论,假定填土的内摩擦角与该点土体位移呈非线性关系,进而提出挡土墙的主动和被动土压力的计算模式。该模式随位移变化是连续的,且能考虑墙土间的摩擦的影响。又将其与砂土模型试验结果进行了对比分析,吻合较好,从而证明用该计算模式计算其主动或被动土压力是合理的。此外,根据该计算模式,导出了一种有效估算其静止土压力系数的计算方法。

Earth pressure calculation theory considering displacement effects

Based on Rankine's earth pressure theory, assuming the internal friction angle of backfill and the displacement are in nonlinear, a calculation model for calculating the passive and active earth pressure acted on the retaining wall is put forward. This model is continuous with displacement variation and can consider the friction of interface between soil and wall. By contrasting the calculated results and the model test results of sands, it is shown that they can agree with each other very well. So it is reasonable to use the calculation model to calculate the active or passive earth pressure. In addition, according to the calculation model, the paper deduces a new kind of effective calculation method to estimate static earth pressure coefficient.