某水电站导流洞出口侧面边坡变形及防护措施

发布时间：2018-02-28 16:20

本文关键词： 边坡变形边坡稳定性支护措施导流洞　出处：《人民长江》2017年13期 　论文类型：期刊论文

【摘要】：某水电站导流洞出口侧面边坡在开挖期间曾出现量值超过0.5 m的大范围持续变形。为分析并解决该问题,首先对变形监测资料进行分析,圈定变形范围,了解边坡变形过程及主要特征;综合采用工程地质分析、极限平衡分析、数值模拟等手段,研究边坡在不同阶段和不同条件下的稳定特征,重点分析不同类型支护措施对限制边坡变形、维护边坡稳定的作用机制及效果。结果表明:边坡开挖过程中,如不及时有效支护,表层第四系土层会发生滑移;现有支护手段能维持边坡在正常工况下的稳定,但边坡安全储备不够;现有支护措施里面,存在过量支护,部分已施工锚索及锚筋桩对提高边坡稳定性系数意义不大。建议通过在边坡后缘增加抗滑桩、对潜在滑移体进行固结灌浆、加强疏排地下水等措施,提高边坡整体稳定性。
[Abstract]:In order to analyze and solve the problem, the side slope of diversion tunnel outlet of a certain hydropower station has sustained deformation in a large range during excavation. In order to analyze and solve this problem, the deformation monitoring data are analyzed first and the deformation range is delineated. To understand the deformation process and main characteristics of the slope, to study the stability characteristics of the slope at different stages and conditions by means of engineering geological analysis, limit equilibrium analysis and numerical simulation, etc. The mechanism and effect of different support measures on limiting slope deformation and maintaining slope stability are analyzed. The results show that the surface Quaternary soil layer will slip in the process of slope excavation without timely and effective support; The existing support means can maintain the stability of the slope under normal working conditions, but the slope safety reserve is not enough; in the existing supporting measures, there is excessive support. Some of the anchoring cables and anchor reinforced piles are of little significance to improve the slope stability coefficient. It is suggested to improve the overall stability of the slope by adding anti-slide piles to the rear edge of the slope, strengthening consolidation grouting of the potential sliding body and strengthening the drainage of groundwater.
【作者单位】：长江岩土工程总公司(武汉);
【基金】：国家重点基础研究发展“973”计划项目(2011CB710603) 水利部公益性行业科研专项经费项目(201001008)
【分类号】：TV223

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