The results showed that when considering only values of permeability of each soil type and intensity of rain is equal to the value of permeability of the soil. Soils with high values of permeability Ks = 10-4 meters per second will be a decrease of the ratio of safety (FS) faster than soils with moderate values of permeability Ks = 10-5 meters per second and soil. with the low water absorption Ks = 10-6 meters per second, respectively. And found that the intensity of rain is lower than the permeability of the soil, it will be a change of the ratio is less secure and change slowly, and when the intensity was gradually increased until close to or higher. the permeability of the soil, the ratio is even lower security by considering the time (t ≤ 24 hours), the ratio of the security has fallen sharply. Considering the slope of the slope from the slope of a slope, the lower the ratio, the higher the default security. In other words, the properties of the soil. (The water permeability of the soil) and the intensity was the main factor affecting the stability of the slope because of the rain, by the nature of the slope. (Slope and thickness of the layer) is a secondary factor affecting the stability of the slope, soil test results, the shear strength of the soil moisture content and found that the shear strength of the soil is inversely proportional to the degree of saturation. soil water By which the cohesion effectiveness has decreased clearly when the humidity increases and the friction angle is analyzed, it has decreased as moisture increased significantly as a result of the stability analysis of slope of the relationship. During the saturation level (Degree of Saturation) Social pressure (Normal Stress) and shear stress (Shear Stress) were analyzed for the index of soil moisture (API) by means of analytical Infinite Slpoe found in the research is. slope averaged 26.5 degrees, the ratio safety of 1.0 Slope of disaster with the saturation level 82 - 86 percent with the index of soil moisture crisis 166.60 to 253.69 mm while the analysis of mathematical models with the Bishop's Simplified. Method of safety ratio of 1.0 to soil moisture index crisis 643.57 mm.
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