Upper Bound Method (UBM) Analysis for the Motivation of Weak Interlayer Rockslides after Heavy Rainfall
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摘要: 采用岩石断裂力学理论结合极限上限定理分析强降雨条件下含夹层顺层岩质边坡的稳定性，得到了岩体裂缝在静水压力作用下的扩展机理及充水裂缝扩展失稳的判据。以极限上限定理为基础，得到了含夹层顺层岩质边坡稳定性评价的上限解，探讨了滑坡后缘裂缝充水深度、滑面浸水长度和滑面抗剪参数的改变对滑坡的启动和稳定性的影响。通过算例表明，岩质斜坡后缘裂缝存在扩展至夹层的临界深度，同时讨论了裂缝充水深度大于临界深度后，滑面浸水长度和抗剪参数改变对坡体稳定性的影响。Abstract: The stability of bedding rock slope with interlayer under heavy rainfall was analyzed by combining the theory of rock fracture mechanics and the upper limit theorem, and the propagation criteria of rock crack under hydrostatic pressure and water-filled crack was obtained. Based on the upper limit theorem, the upper limit solution for the stability evaluation of bedding rock slope with interlayer is obtained, and the effects of the change of water filling depth of cracks at the back edge of landslide, immersion length of sliding surface, and shear parameters of sliding surface on the start-up and stability of landslide are discussed. An example shows that there is a critical depth for the crack at the trailing edge of the rock slope to expand to the interlayer. The influence of the change of the immersion length and shear parameters of the sliding surface on the stability of the slope is discussed when the water-filling depth of the crack is greater than the critical depth.
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Key words:
- rock landslide /
- crack extension /
- upper-bound theorem /
- stability
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