抗剪强度随干湿循环变化对边坡安定性的影响

干湿循环将会导致岩土介质的抗剪强度产生循环变化.本文探讨了干湿循环中材料参数的循环变化对边坡安定性的影响.将材料性质的循环变化等效成载荷,并与孔隙水压的循环变化一同在安定分析中统一进行分析.最后对一算例进行计算,结果表明,即使只考虑抗剪强度参数10%的循环变化,边坡的安定安全系数也会比极限安全系数有相当程度的减小,表明抗剪强度随干湿循环的变化,会对边坡的安定性产生不可忽视的影响.

Effect of shear strength variation on shakedown safety of slopes due to cyclic wetting drying

The cyclic wetting drying of geo material may lead to variation of shear strength. The effect of material parameters variation due to cyclic wetting drying on shakedown safety of slopes is investigated. The cyclic variation of material property is regarded as an equivalent load and its effect on shakedown safety is analyzed together with the cyclic variation of pore water pressure. A numerical example is given for demonstration. The result shows that the safety factor is obviously less than that in limit analysis, even if the parameters varies only 10%. It means that the effect of cyclic variation of shear strength on shakedown safety of slope due to cyclic wetting drying can not be neglected.