摘要
恶滩水电站4#机基础开挖形成40m左右的高边坡,开挖过程中,边坡上部的纵向混凝土围堰不断出现横向和纵向裂缝,监测资料表明其有明显的水平和垂直位移。本文采用弹塑性有限差分数值模拟方法,对基坑开挖过程中混凝土围堰和4#机高边坡内的应力应变状态进行分析,同时结合地质资料和现场变形观测资料分析,多角度分析了边坡的变形机制。结果表明,河水位升降变化、高边坡施工开挖、F711断层揭露以及复杂的地质条件等是变形的主要影响因素,同时采用二维塑性力学上限解方法对该高边坡的稳定性进行分析,并提出采用以预应力锚索为主的边坡加固方案。监测结果表明,加固后边坡处于稳定状态。
A lot of transverse and longitudinal cracks appear in the concrete cofferdam in course of the excavation of the basis of the unit No.4 in E'tan hydropower station. In this paper, the authors analyze the stress and strain situation in the cofferdam and high slope during the excavation by the elastic-plastic finite difference method, and discuss the deformation mechanism of the cofferdam and the high slope according to the geological and observational data. The result shows that the main influence factors of the deformation are the water level change of river, the excavation, the complex geological condition, and so on. At the meanwhile, the authors analysis the stability of the high slope by the upper bound result of plastic mechanics method, and put forward a reinforcement design plan. Observation data shows that the reinforced slope is stable.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2005年第1期16-21,共6页
Hydrogeology & Engineering Geology
