锦屏一级水电站左岸边坡是目前水电工程开挖高度最高、开挖规模最大、稳定条件最差的边坡工程之一,其中由几组构造结构面切割成的变形拉裂体对整个边坡的稳定性尤为重要。介绍了拉裂体施工期监测情况,依据监测资料运用了对比法、因素分析法和特征值统计法等,并结合地质条件和施工信息对拉裂体变形在时间演化规律和空间分布特征等进行了综合分析。综合分析表面、浅部及深部的变形监测资料结果表明经开挖支护后变形拉裂体与边坡整体变形特征总体一致,历经6年多的考验,已趋于稳定。
Abstract
The left bank excavation slope of Jinping first stage hydropower station is remarkable of its height, scale and bad stability condition. The tension-displaced rock mass is comprised of several structural tectonic structural planes and is critical to the stability of the whole excavation slope. The safety monitoring for the tension-displaced rock mass is introduced. Overall analysis on the time evolution and spatial distribution of the tension-displaced rock mass is conducted by using correlation, factors analysis, and eigenvalues statistics according to geological conditions and construction information. The monitoring data of surface, shallow and deep deformation suggest that the tension-displaced mass is consistent with the overall slope deformation characteristics after excavation and support, and after six years of tests, it has gradually stabilized.
关键词
变形拉裂体 /
施工期监测 /
影响因素 /
对比分析 /
变形特征
Key words
tension-displaced rock mass /
monitoring during construction /
influence factors /
comparative analysis /
deformation features
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参考文献
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