南江县坪河乡九义校滑坡稳定性分析

通过野外调研和搜集现有资料,系统地分析了巴中市南江县九义校滑坡的地质环境和滑坡特征。根据坡体的结构及形态特征研究了滑坡的形成机制,判定九义校滑坡为牵引式土质滑坡,破坏模式为蠕滑拉裂。最后分析各工况的影响因素,并运用传递系数法进行滑坡稳定性验算,得出稳定性计算成果,内聚力c值和内摩擦角φ值的变化对安全系数K的影响。经过稳定性分析计算说明,该滑坡在天然工况下整体稳定性较好,在暴雨下处于欠稳定状态,易产生整体滑动,说明降雨无疑对滑坡的形成发展起到了至关重要的作用。为了防止雨季期间雨水下渗降低坡体稳定性,造成滑坡土体失稳或局部溜滑变形破坏,威胁危险区内人民的生命财产安全,建议尽快开展该地质灾害体的工程防治。

The stability analysis of the landslide in nine righteousness school Pinghe Nanjiang county

This paper is based on the field investigation and collecting the existing materials,to analyze the geological environment and landslide characteristics systematically of the nine righteou-sness landslide in Nan-jiang county Bazhong city,to study the formation mechanism of the landslide according to the structure and morphological characteristics of the slope.Then it judges that the nine righteousness landslide is a traction-type soil slope,and the damage model is creep crack.At last,it analyzes the influencing factors of each condition,and makes the stability calculation by transfer coefficient method.The results show that the change of cohesion C and internal friction angle φ will influence the safety factor K.The analysis on the stability calculation shows that the overall stability of landslide is better under the natural condition,less stable in heavy rain and easy to trigger the whole sliding.The rainfall will no doubt play a crucial role to the formation and development of landslide.In order to prevent the reduction of slope stability by rainfall infiltration during the rainy season,the soil instable or local slippery deformation on the landslide,and the treat to people’s lives and property in danger areas,it suggests to carry out the geological disaster prevention and control as soon as possible.