结合永靖县盐锅峡黑方台黄土塬边焦家滑坡实例分析，以焦家滑坡地下水浸润带为研究对象，利用理论分析、数值模拟方法，探索焦家滑坡体内地下水浸润带的渗透特性及其与斜坡稳定的关系。得到了一些有价值的结论： （1）首次提出了焦家滑坡特殊的灌溉诱发滑坡的浸润（软化）-拉裂机理：大水漫灌—水体下渗—浸润带形成—黄土坡体蠕动变形—坡体后缘拉裂—拉裂面、浸润软弱面贯通—滑坡发生。对黄土滑坡的运动轨迹曲线方程及滑速进行了推导，并以焦家滑坡实例进行了计算，认为焦家滑坡运动轨迹曲线为一近似抛物线，滑体在剪出口位置时滑速达到最大值16.55m/s。 （2）首次提出了“坡体浸润比”的概念（/），以此探索台塬区灌溉水下渗过程中地下水浸润带在台塬斜坡空间上的占有率，并对浸润带的发展演化规律进行定量的分析。建立了地下水位等速上升时地下水浸润带锋面变化的数学模型，求得浸润带锋面位置变化函数曲线。 （3）坡体浸润比与地下水位高程关系曲线整体呈上升趋势，随着地下水位的上升，焦家滑坡坡体浸润比值线性增大，斜坡体内地下水浸润带逐渐扩张，浸润带内水分对土体的浸润破坏能力也随之加强。 （4）以坡体浸润比的变化定义地下水浸润带的演化，通过SEEP/W模块进行渗流特性分析，焦家滑坡体内地下水渗流方向以X方向为主，焦家滑坡体体内地下水渗流速率随坡体浸润比的增大线性增加，在其值为0.192时达到最大值，随后保持近似直线的平稳状态；同时水分渗流速率在塬边斜坡临空面处达到最大，呈聚集形态由坡脚向坡外渗出，且在水成红粘土层（相对隔水层）靠近坡脚的位置处出现流速集中的现象。 （5）通过SLOPE/W模块进行稳定性模拟分析得到：焦家滑坡稳定系数与坡体浸润比值关系曲线前段呈略向下行的近似平稳状态，后又以近线性形态急剧降低，表明“坡体浸润比”值（ζ）与滑坡稳定性密切相关，ζ存在拐点，当ζ<0.170时，滑坡稳定系数缓慢降低，对滑坡稳性影响不大；当ζ>0.170时，滑坡稳定系数急剧降低，对滑坡稳性影响显著。

This paper combined with the Heifangtai tableland edge Jiaojia landslide of Yongjing county Yanguoxia town case analysis, in Jiaojia landslide groundwater infiltration zone as the research object, using the method of theoretical analysis and numerical simulation, to explore the Jiaojia landslide slope groundwater infiltration in the body of the change and its relationship with the slope stability. Some valuable conclusions are obtained: (1)The paper first puts forward the Jiaojia special irrigation induced landslide of infiltration (softened)-cracking mechanism: flood irrigation-water infiltration-infiltration zone formation-creep deformation of loess slope body-trailing edge cracking-cracking of the slope body and infiltrates surface through weak - landslide. Papers on the trajectory curve equation of the loess landslide and sliding speed were deduced, and calculated on the Jiaojia landslide example; Think of Jiaojia landslide motion curve is an approximate parabolic, and the slippery body cut in export position slip velocity to a maximum of 16.55 m/s. (2)The Paper first puts forward the concept of " the slope infiltration ratio（/）"；Use this concept to explore the share in groundwater infiltration zone with tableland slopes space in the process of the tableland edge irrigation water infiltration. and the evolvement and the development of infiltration with quantitative analysis. Established the mathematical model of constant underground water level rises groundwater infiltration with frontal changes. The infiltration function curve was carried out to solve the front position. (3)The slope infiltration ratio and underground water level elevation relationship curve integral is on the rise. As the underground water level rise, the linear Jiaojia landslide slope infiltration ratio increases, the slope groundwater infiltration in the body gradually expand, and infiltrating in-band moisture damage to the soil infiltration capacity has been strengthened. (4)With the change of the slope infiltration ratio defined the evolution of the groundwater infiltration zone. To analyze seepage characteristics by SEEP/W module: Jiaojia landslide body direction of groundwater seepage in the X direction is given priority to; Jiaojia landslide body of groundwater seepage rate increased along with the increase of slope infiltration than linear, reach maximum in its value of 0.192, then keep the approximate linear steady state; Water seepage rate reached maximum on the slope free face at the same time, it is gathered outside form from the slope toe to the slope, and in the water into red clay layer (relative water-resisting layer) location near the slope toe, the phenomenon of the flow concentration. (5) The paper simulates and analyses the stability get some results Through the SLOPE/W module: Jiaojia landslide stability coefficient and the relation curve slope infiltration ratio down in front of the approximate stationary state, then nearly linear form drastically reduced. This suggests that slope infiltration ratio values (ζ) are closely related to the landslide stability. The values (ζ) existed a turning point when the ζ< 0.170, slowly reduce landslide stability coefficient, little influence on the landslide stability; when the ζ> 0.170, stability coefficient of landslide is drastically reduced, and obvious influence on the stability of the landslide.