济南市南部山区水井北村滑坡成因机制及稳定性研究

2019年8月,济南市南部山区水井北村发生滑坡地质灾害。根据水井北村滑坡的地质背景,针对性布置物探、钻探等勘查手段,研究滑坡工程地质特征,分析水井北村滑坡类型及发生的地质成因机制;采用刚体极限平衡分析法,研究水井北村滑坡整体稳定性。研究认为断裂发育、岩层风化、地势、浅层含水层受降雨影响,是水井北村地质灾害点具备滑坡发生的内在条件。降雨和泉水入渗、耕植等行为是滑坡发生的外在条件。水井北村山体滑坡在天然条件下,稳定系数平均值为1.033,整体属欠稳定状态。暴雨状态下,稳定系数平均值为0.903,坡体处于不稳定状态。

Study of Origin Mechanism and Stability of Shuijingbeicun Landslide In Southern Mountain Area in Ji'nan City

In August 2019, when typhoon "liquima" passed through, a landslide occurred in Shuijingbeicun in the southern mountainous area in Ji''nan city. According to geological background of Shuijingbeicun landslide, geophysical exploration, drilling and other exploration methods are arranged to study the engineering geological characteristics of landslide, and analyze the types and geological mechanism of Shuijingbeicun landslide. The rigid limit equilibrium method is used to study the overall stability of Shuijingbeicun landslide. It is concluded that the development of faults, rock weathering, topography and shallow aquifer are seriously affected by rainfall. Rainfall, infiltration of spring water and cultivation are the external conditions of landslide. Under natural conditions, the average stability coefficient of Beicun landslide is 1.033, which is in an unstable state. Under the rainstorm condition, the average value of stability coefficient is 0.903, and the slope is in an unstable state.