金佛山水库左岸岩质高边坡稳定性分析

Stability Analysis of High Rocky Slope at Left Bank of Jinfoshan Reservoir

以重庆市南川金佛山水库左岸岩质高边坡为例,采用极限平衡法、赤平极射投影图解法及工程地质分析法综合分析了原始边坡稳定性状况、设计开挖加固方案对边坡稳定性影响及地震作用下潜在滑坡破坏机制。结果表明,原始潜在滑坡上部为滑移—压致拉裂式破坏机制,下部为塑流—拉裂式破坏机制;开挖边坡前缘强风化、强卸荷岩体有利于边坡稳定,采用锚喷混凝土支护的设计加固方案效果显著;按基本烈度Ⅶ度进行工程抗震设防时边坡整体安全,大规模惯性失稳可能性较小。

Taking the high rocky slope at left bank of Jinfoshan reservoir in Chongqing City for an example,the original slope stability,the impact of excavation and reinforcement scheme on the slope stability and the potential landslide failure mechanism under action of earthquake are analyzed by using the limit equilibrium method,stereographic projection and engineering geological analysis.The results show that the upper part of the original potential landslide is the slip-pressure induced cracking failure mechanism;the lower part is the plastic flow-crack failure mechanism;excavated strong weathering and unloading rock mass is conducive to the slope stability,the effect of the bolting and shotcreting reinforcement scheme is very significant;the slope is safe under seismic protection of the basic intensity Ⅶ,the possibility of large-scale inertial instability is not obvious.