非极限被动土压力的近似计算方法

Calculation of unlimited passive earth pressure

文章分析了位移对被动土压力的影响规律,发现被动土压力取决于挤压应力与位移的关系,因此,可用双曲线函数模拟挤压应力与位移的关系;在此基础上建立了非极限被动土压力的近似计算方法,给出公式中参数的近似表达式,并分析了内摩擦角与位移对被动土压力的影响;通过模型试验验证了该方法的合理性;最后,推导了非极限朗肯被动土压力理论,为被动土压力的计算提供一种新的方法。

By studying the law of the effect of displacement on passive earth pressure, it is found that the passive earth pressure depends mainly on the relationship between squeezing stress and displacement which can be simulated by the hyperbolic function. The approximate mathematic expression of the unlimited passive earth pressure is given and the expression of the parameter is also derived based on a model test. The influence of the internal friction angle and displacement on passive earth pressure is studied. This method is proved feasible and reasonable by another model test. Finally, the unlimit- ed Rankine passive earth pressure model is derived, which offers a new way of calculating passive earth pressure considering displacement.