Construction of Slope Stability Analysis System which took Physiccal and Chemical Characteristic of the Landslide Clay

本文介绍了一种结合物理特性和化学特性的新型边坡稳定性分析系统。研究结果如下：(1)为了实现无滑坡迟滞情况下的稳定性分析，将土的风化情况波动、孔隙水压力等滑动因素替换为土的物理或动力因素。在此基础上，提出了一种近似于实际滑动的滑动行为模拟方法。(2)研究了掌握土层剪切特性的估计或测试方法。在此基础上，提出了一种对边坡稳定性分析具有重要意义的剪切特性估计方法。(3)通过对地下水pH值的监测，对酸性土壤的特征进行了若干研究。结果发现，在边坡稳定性分析体系中，土壤pH值与强度/变形特性之间的关系必须作为“滑坡粘土的一种物理化学特性”加以结合。(4)对渗流水（融雪水）对滑坡粘土层的形成进行了考察。(5)对北陆地区滑坡的主要成因之一——融雪水生成机制进行了研究。由于北陆地区冬季气温较高，积雪特征和天气条件差异较大，因此建立考虑这些区域特征的实用融雪转换模型具有重要意义。综上所述，本文提出了适用于北陆地区稳定性分析的融雪转换模型。

This paper describes a new slope stability analysis system combining the physical and chemical characteristic.As the result of this study followings are found.(1) In order to enable the stability analysis in the case of no landslide hysteresis, sliding factors such as the fluctuation of weathering situation and pore water pressure of the soil were replaced with the physical or dynamic factors of the soil. By including the assumption above, a method for simulating the sliding behaviors which can situate similarly to actual sliding was proposed.(2) The estimation or testing methods to grasp the shearing characteristic of the soil layers were investigated. Then a method to estimate the shearing characteristic that is important for slope stability analysis was proposed.(3) By noticing pH of the groundwater, several investigations on the characteristics of acid soil was carried out. As the result, it was found that the relationship between pH of soil and strength/deformation characteristics has to be combined in slope stability analysis system as "a physical-chemical characteristic of landslide clay".(4) An examination of the generation of landslide clay layer by the seepage water (snowmelt water) was carried out.(5) An examination on the snowmelt water generation mechanism that is one of the main attributions of the landslide in the Hokuriku district was carried out. Because the temperature in winter season in Hokuriku district is comparatively high and the characteristics of snow and the weather condition are significantly different, therefore, the establishment of practical snowmelt conversion model considering these regional characteristics is important. From the conclusions mentioned above, finally, snowmelt conversion model that is applicable to the stability analysis in the Hokuriku district was proposed in this study.