2009年兰州市九州石峡口滑坡成因及其西侧高边坡稳定性研究

Study on the Forming Cause of Shixiakou Landslide at Jiuzhou,Lanzhou City,in 2009 and Stability of Its Western Neighbouring High Slope

2009年5月16日兰州市九州石峡口小区西侧山体发生滑坡灾害,造成重大生命和财产损失。本文对石峡口滑坡的特征和成因进行了系统研究,认为滑坡区高陡的地形、不合理的绿化灌溉和不良的岩土体工程地质性质是诱发该滑坡的主要因素。在分析石峡口滑坡成因的基础上对与该滑坡相邻的西侧高边坡进行了稳定性研究,采用有限元强度折减法计算出潜在滑面的位置和稳定系数,并和极限平衡法计算结果做比较,结果表明有限元强度折减法与传统极限平衡法计算的稳定性系数很接近,增强了计算结果的可靠性。

A landslide disaster happened at the hill west to Shixiakou district in Jiuzhou,Lanzhou city,on May 16,2009,which caused great life and property lose.A systematic research on the characteristics and forming cause of Shixiakou landslide is achieved in this paper.It is considered that the key factors of the landslide are unreasonable false virescence irrigation,the high and steep topography in landslides region,and poor rock and soil mass engineering geological properties.Based on the cause analysis of Shixiakou landslide,research on Stability of its western neighbouring high slope is done.The safety coefficient and the potential failure surface are evaluated by strength reduction FEM.As a comparison,limit equilibrium method is executed.The calculation results show that the safety factor calculated by the strength reduction FEM is fairly close to the that calculated by the traditional limit equilibrium method,which ensured the reliability of the result.