多剖面合力法分析滑坡稳定性

发布时间：2018-08-15 19:05

【摘要】：滑坡稳定性分析最重要的是精度。滑面和坡面是空间三维变化曲面,造成滑体厚度各处变化很大。滑坡稳定性分析通常选择中轴线或其附近的一个所谓"代表性纵断面"进行安全系数计算。由于采用单位宽度纵剖面计算,在多数情况下只能代表该纵剖面两侧不大范围宽度滑体的局部稳定性,而不能代表滑坡整体稳定性,因此提出多纵剖面合力法进行滑坡稳定性分析。为减少多剖面勘探成本的人财物力投入,把滑动面分成了简单滑面和复杂滑面两类。对简单滑面滑坡最少只打两个纵断面共2~4个钻孔,应用几种滑面曲线函数,绘制辅助横剖面,将所需要的多个计算纵剖面剖出。多剖面合力法是基于空间平行力系可移动原理,对各剖面划分条块,把每个剖面条块的剪应力与抗滑力分解成水平与垂直分力,然后计算每个剖面剪应力与抗滑力的垂直与水平分力各自的合力,再对各剖面的剪应力与抗滑力的水平与垂直分力求合力,计算出滑坡的抗滑力与下滑力,得到剪应比——滑坡的稳定系数。用简单滑面和复杂滑面两个滑坡实例进行了分析,验证方法的有效性。
[Abstract]:The most important thing in landslide stability analysis is accuracy. The sliding surface and the slope surface are three dimensional surface, which results in great variation of the thickness of the sliding body. In landslide stability analysis, a so-called "representative longitudinal section" is usually used to calculate the safety factor. Because the unit width longitudinal section is used to calculate, in most cases, it can only represent the local stability of the slip body with small width on both sides of the longitudinal section, but not the whole stability of the landslide. Therefore, the multi-longitudinal section force method is put forward to analyze the landslide stability. In order to reduce the cost of exploration, the sliding surface is divided into two types: simple sliding surface and complex sliding surface. In this paper, at least two vertical sections with 2 ~ 4 boreholes are drilled for a simple slide. Several kinds of slip surface curve functions are used to draw the auxiliary cross section, and many calculated longitudinal sections are cut out. The multi-section resultant force method is based on the principle that spatial parallel force system can be moved. Each section is divided into strips, and the shear stress and anti-slide force of each section are decomposed into horizontal and vertical forces. Then, the vertical and horizontal forces of shear stress and anti-slide force of each section are calculated, and the horizontal and vertical forces of shear stress and anti-slide force of each section are calculated to calculate the slide resistance and sliding force of the landslide. The stability coefficient of shear ratio-landslide is obtained. Two landslide examples, simple slide surface and complex slide surface, are used to verify the effectiveness of the method.
【作者单位】：中国科学院页岩气与地质工程重点实验室中国科学院地质与地球物理研究所;德州农工大学埃尔帕索农业生命科学研究中心;
【分类号】：P642.22

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