论文部分内容阅读
分析强降雨饱和状态下平面滑动型(平滑型)滑坡的地下渗流的水流运动规律,同时考虑静水压力和动水压力的耦合作用,提出饱和状态下平滑型滑坡边坡稳定性分析新思路。运用地下水动力学原理,给出假设条件简化分析过程,导出强降雨下地下渗流水流运动方程。基于条分法理论,考虑坡体各点水流运动的不均匀性,改进传统的边坡稳定性系数计算公式,并给出边坡失稳的临界条件。以四川省汉源县万工集镇二蛮山滑坡为例,验证计算公式的合理性。研究表明,强降雨饱和状态下平滑型滑坡的稳定性主要取决于岩土体饱水内摩擦角、渗透系数K、滑体规模(厚度、长度等)和坡顶相对坡脚水位差Δh。该研究成果可用于指导抢险救灾工作,具有一定的工程实用意义。
The law of subsurface flow in plane slip type landslide under strong rainfall saturation is analyzed. Considering the coupling action of hydrostatic pressure and hydrodynamic pressure, a new idea of stability analysis for the smooth landslide is proposed. Using the principle of groundwater dynamics, this paper gives assumptions to simplify the analysis process and derive the equation of subsurface flow under strong rainfall. Based on the theory of strip divisions, the inhomogeneity of water flow motion at each point of slope is considered, the formula of traditional slope stability coefficient is improved, and the critical condition of slope instability is given. Taking the Erqiangshan landslide in Wanjongji Town, Hanyuan County, Sichuan Province as an example, the rationality of the calculation formula is verified. The results show that the stability of smooth landslide under strong rainfall saturation mainly depends on the saturated water internal friction angle, permeability coefficient K, scale (thickness, length and so on) of the landslide and the water head difference Δh between the top and bottom of the slope. The research results can be used to guide the rescue and relief work, which has certain practical significance.