降雨誘發(fā)型殘坡積土滑坡形成機(jī)理分析
發(fā)布時間:2018-12-07 18:13
【摘要】:以馬家村滑坡為例,用有限元方法分析了降雨入滲條件下殘坡積土斜坡的暫態(tài)非飽和滲流場,用極限平衡方法分析了殘坡積土斜坡的滲流穩(wěn)定性。分析了斜坡結(jié)構(gòu)、臨空面、降雨對斜坡變形與穩(wěn)定性的影響,分析了降雨誘發(fā)殘坡積土滑坡的過程。降雨誘發(fā)殘坡積土滑坡的機(jī)理為:降雨入滲使殘坡積土斜坡中形成軟弱帶;坡腳開挖使斜坡坡面出現(xiàn)拉張裂隙;降雨使坡面裂隙中充滿水,導(dǎo)致斜坡土體飽和,抗剪強(qiáng)度降低,同時產(chǎn)生動水壓力,不利于斜坡的穩(wěn)定;當(dāng)斜坡的下滑力大于抗滑力時發(fā)生滑動。
[Abstract]:Taking Majiacun landslide as an example, the transient unsaturated seepage field of residual slope under rainfall infiltration is analyzed by finite element method, and the seepage stability of residual slope is analyzed by limit equilibrium method. The effects of slope structure, face to face and rainfall on slope deformation and stability are analyzed, and the process of rainfall induced residual slope soil landslide is analyzed. The mechanism of rainfall induced residual slope soil landslide is as follows: the weak zone is formed in the slope of residual slope caused by rainfall infiltration, and the tensile crack appears in slope surface caused by excavation of slope foot; Rainfall fills the cracks of the slope with water, which leads to the saturation of the slope soil, the decrease of the shear strength, and the formation of dynamic water pressure, which is not conducive to the stability of the slope. When the sliding force of the slope is greater than the anti-slide force, the sliding occurs.
【作者單位】: 長安大學(xué)地測學(xué)院;
【分類號】:P642.22
本文編號:2367617
[Abstract]:Taking Majiacun landslide as an example, the transient unsaturated seepage field of residual slope under rainfall infiltration is analyzed by finite element method, and the seepage stability of residual slope is analyzed by limit equilibrium method. The effects of slope structure, face to face and rainfall on slope deformation and stability are analyzed, and the process of rainfall induced residual slope soil landslide is analyzed. The mechanism of rainfall induced residual slope soil landslide is as follows: the weak zone is formed in the slope of residual slope caused by rainfall infiltration, and the tensile crack appears in slope surface caused by excavation of slope foot; Rainfall fills the cracks of the slope with water, which leads to the saturation of the slope soil, the decrease of the shear strength, and the formation of dynamic water pressure, which is not conducive to the stability of the slope. When the sliding force of the slope is greater than the anti-slide force, the sliding occurs.
【作者單位】: 長安大學(xué)地測學(xué)院;
【分類號】:P642.22
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