基于SMP准则的土体三维应力状态土压力问题

Earth pressures of three-dimensional soil stress states based on SMP failure criterion

基于SMP准则,分析了土体处于三维应力状态下的土压力问题,推导出无粘性土的主被动土压力的计算公式,通过引入粘结力σ0将其扩展到粘性土,和实测数据及朗肯理论计算结果进行了对比。结果表明:朗肯土压力理论所得的主动土压力偏大,采用本文公式计算所得结果更为接近实测值,从而说明考虑土体三维应力状态对分析土压力的设计计算具有一定的指导意义。

Based on the SMP failure criterion, the earth pressure problem for soils under the three-dimensionai stress states was analyzed, and the formula of the active and passive earth pressures for non-cohesive was derived. The formula was extended to that for clay by introducing a parameter of bonding stress σ0. Compared with those obtained from the experiment and Rankine＇s earth pressure theory, it is shown that the active earth pressures determined by Rankine＇s earth pressure theory are larger than those obtained by the experiment, So the proposed formula is helpful to the design and calculation of earth pressures.