膨胀土堑坡雨季失稳的突变模型

以受结构面的控制膨胀土堑坡滑坡失稳为例,考虑降雨条件下,滑面介质的应变软化和水致弱化,提出了一个简单的考虑吸水膨胀的力学模型,并利用突变理论分析其失稳破坏的力学机制。在突变分析中,通过尖点突变模型,分析了刚度比、含水量等因素对滑坡的触发作用。结果表明:滑坡的演化过程是内外部因素共同作用的结果,降雨导致结构面介质膨胀软化的原因属于外部的触发因素。在膨胀土堑坡的加固防护中,应当充分地考虑水的治理。

Cusp Catastrophe Model for Cutting Slope Failure of Expansive Soils in Rainy Season

Taking cutting landslide of expansive soils controlled by discontinuities as an example,a simple mechanical model considering water swelling is proposed,which takes the strain-softening and water-softening of slip surface materials under the condition of rainfall into the consideration.Furthermore,the mechanism of the cutting slope of expansive soils is analyzed by catastrophe theory.Many factors trigger landslide,such as moisture content and stiffness ratio.The results show that evolution process of landsl...