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以成都凤凰山滑坡为地质原型,通过成因机制及数值模拟分析,再现了一个近水平层状的膨胀土斜坡的变形破坏过程。研究结果表明:膨胀土斜坡的失稳破坏主要受坡体内部发育的裂隙以及降雨入渗的影响,裂隙的发育使降雨入渗向坡体深部发展,并使土体的强度随降雨过程不断降低,而滑坡后缘裂隙的充水对坡体产生了较大的静水压力。在这两种因素的影响下,斜坡发生了类似于平推式滑坡的失稳破坏。
Taking the Fenghuangshan landslide in Chengdu as the geological prototype, the deformation and failure process of expansive soil slopes in the near horizontal strata are reproduced by genetic mechanism and numerical simulation. The results show that the failure of expansive soil slope is mainly affected by the development of cracks in the slope and the infiltration of rainfall. The development of fractures makes the infiltration of rainfall to the deep part of the slope, and the strength of the soil decreases with the rainfall process , While the filling of the landslide fissures produced larger hydrostatic pressure on the slope. Under the influence of these two factors, the instability damage of the slope similar to the push-push landslide occurred.