锦屏一级水电站大奔流料场高边坡断层及结构面发育,开挖高度巨大,边坡变形特征及破坏机制十分复杂。在工程地质分析的基础上,采用数值计算,分析了边坡变形特征、破坏机制,评价了边坡稳定性。研究表明:边坡开挖变形以卸荷回弹为主,竖向变形大于水平变形,层间错动带及陡倾断层错动变形较大;浅部的层间错动面多处于剪切极限状态和不连续张开状态;边坡局部存在塑性破坏区,主要分布于薄层砂板岩、剪切错动带及坡体浅表,以拉伸破坏为主,少量剪切破坏;边坡潜在破坏机制为溃屈破坏。开挖后的边坡安全系数满足规范要求。
Abstract
Due to developed faults and structural planes and huge excavation height, the deformation and failure mechanisms of the high slope at Dabenliugou quarry of Jinping-ⅠHydropower Station are complicated. On the basis of engineering geological analysis, we analysed the deformation features and failure mechanism of the slope, and assessed the slope’s stability through numerical calculations. Results showed that: 1) unloading rebound is the major form of slope deformation, and vertical deformation is greater than horizontal deformation, the sliding deformations of interlayer staggered surface and steep dip fault are large, and shallow interlayer staggered surface is mostly in shear limit state and discontinuous opening state; 2) partial plastic zone (largely in tensile failure and a bit shear failure) mainly distributes in thin sandy slate, interlayer shear zone and the slope’s shallow surface; 3) the failure mechanism of high slope of Dabenliugou quarry is buckling failure; 4) the safety factor of slope after excavation meets standard requirements.
关键词
锦屏水电站 /
高边坡 /
工程地质分析 /
数值计算 /
变形特征 /
破坏机制
Key words
Jinping hydropower station /
high slope /
engineering geology analysis /
numerical simulation /
deformation characteristics /
failure mechanism
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参考文献
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基金
国家重点基础研究发展计划(973)项目(2011CB710603);中央级公益性科研院所基本科研业务费项目(CKSF2014065)
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