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挡土结构上土压力的计算是土力学和岩土工程领域的基本研究课题之一。实际工程中的土压力通常是介于主动土压力和被动土压力之间的某一值,墙后填土由于碾压具有较高的密实度。经典的朗肯和库仑土压力理论只能计算极限状态下的土压力,没有考虑挡墙的位移以及剪切过程中密砂的强度从峰值强度降低到残余强度这一强度变化特性对于土压力的影响。给出了考虑挡墙位移效应的被动侧土压力计算方法,该方法能够同时考虑剪切过程中密砂的强度从峰值强度降低为残余强度这一强度变化特性对被动土压力的影响。通过土压力模型试验结果对计算方法进行了初步验证,计算结果和试验结果吻合较好,表明了该方法的有效性。
Earth pressure on retaining structure is one of the basic research topics in soil mechanics and geotechnical engineering. The actual earth pressure is usually between the active earth pressure and the passive earth pressure. The backfill of the wall has a higher density due to the rolling. The classical Rankine and Coulomb earth pressure theory can only calculate the earth pressure in the limit state without considering the displacement of the retaining wall and the intensity change characteristics of the sand from the peak intensity to the residual strength during the shear process. influences. The calculation method of earth pressure on the passive side considering the displacement effect of retaining wall is given. The method can simultaneously consider the influence of the strength change of the sand from the peak strength to the residual strength on the passive earth pressure. The calculation method is preliminarily verified by the soil pressure model test results. The calculated results agree well with the experimental results, which shows the effectiveness of the method.