三峡库区某高切坡稳定性分析与治理措施

对三峡库区某高切坡的稳定性进行定量分析计算,并对该高切坡的加固与防护措施进行了施工图设计。首先,根据高切坡的特点将其分为3个区段,分析了高切坡变形的地质条件和边坡滑移模式,针对不同的滑移破坏类型提出相应的稳定性计算方法。然后,对该高切坡多个典型地质剖面,在天然状态和暴雨工况下分别进行稳定性计算,得到其安全系数为0.939～1.268,表明该高切坡在暴雨工况下的稳定性较低。最后,在定量评价边坡稳定性的基础上,对高切坡的3个区段,分别采取清除危岩体、锚杆加固、挡土墙固脚与挂网喷射混凝土护坡等综合治理措施,以增强边坡的整体稳定性。实践证明,这些措施可以消除高切坡滑移的安全隐患,工程治理效果良好。

Stability Analysis and Treatment Measure of High Cut Slope in Three Gorges Reservoir Region

The stability of a high cut slope in the Three Gorges Reservoir Region was quantitatively analyzed and calculated,and its stabilization and protection were designed in detail for construction drawing. Firstly,the engineering geological conditions which caused the deformation and the landslide pattern of the slope were studied,and the stability calculation methods for different landslide patterns were put forward. Under the conditions: deadweight with the effect of ground water,deadweight and rainstorm,the stability for three representative longitudinal geological sections were calculated and analyzed. The stability coefficient of 0.939 to 1.268 indicates that the slope maybe collapses entirely when the groundwatcr level rises or it suffers sustaining rainstorm. Based on the characteristics of the high cut slope,it may be divided into 3 zones. The comprehensive treatment measures such as cut of unstable rock,anchor strengthening,reinforced earth retaining wall and bolt-shotcrete support were used to increase the whole stability of the slope. The practice proves that those measures can erase the incipient fault of slope slipping,and the results show that the method is practical and economical.