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本文基于现场变形调查和数值模拟分析,研究了华安县大坑村滑坡在人工开挖以及降雨条件下的变形特征,计算了不同开挖时步以及不同工况下的边坡稳定性系数,并探讨了该滑坡的变形破坏机理.结果表明:开挖过程中,边坡前缘抗滑阻力减小,前缘部位最先产生变形,牵引中后缘坡体表面产生张拉裂缝,降雨期间雨水沿裂缝渗入坡体,岩土体容重增加,岩土体抗剪强度降低,最终诱发深层滑移破坏.分析表明,人工开挖及降雨入渗是大坑村土质边坡产生深层滑移破坏的主要影响因素.深层滑移破坏后,边坡岩土体结构松散,在暴雨作用下,再次诱发滑坡前缘浅表层松散体产生圆弧面滑移破坏.
Based on the field deformation investigation and numerical simulation analysis, the deformation characteristics of the Da Hangcun landslide in Huaan County under artificial excavation and rainfall are studied, and the slope stability coefficients at different excavation times and in different conditions are calculated. The deformation and failure mechanism of the landslide is discussed.The results show that during the excavation process, the anti-skid resistance of the slope front decreases and the leading edge of the landslide first deforms and the trailing edge of the traction leads to tension cracks, Along the cracks infiltration slope, the bulk density of rock and soil increases, the shear strength of rock and soil decreases, eventually inducing deep slip damage.It is shown that artificial excavation and rainfall infiltration is the deep slip damage of soil slope After the deep slip damage, the slope rock and soil body structure is loose, under the action of heavy rain, it induces the arc slip slip damage once again on the shallow loose body of the landslide front.