Effect of Initial Geo-Stress on Deformation of Anti-Dip Layered Rock Slopes
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摘要: 初始地应力场对反倾层状岩质边坡的变形破坏会产生重要影响。以西部代表性水电工程岸坡区域的实测地应力资料为基础选择9 种初始地应力状态，以非连续变形分析方法（DDA）为工具，对不同边坡坡角和岩层角度组合的反倾岩质边坡模型进行变形分析。结果表明考虑初始地应力的释放之后，边坡倾倒变形所需的岩层倾角与边坡坡角条件有所降低，侧压力系数对变形趋势发挥主导作用，同样的水平地应力情况下，垂直地应力降低会导致变形有所增加。当存在较大水平地应力时，为保障安全，岩层倾角大于60°的反倾岩质边坡坡角建议不超过45°。
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关键词:
- 反倾岩质边坡 /
- 初始地应力 /
- 变形 /
- 非连续变形分析(DDA)
Abstract: The initial geo-stress field is an important factor in the deformation and damage of anti-dip layered rock slopes. Based on the measured geo-stress data in the typical abutment slopes at certain western hydropower projects, nine geo-stress states are selected, and the deformations of the anti-dip rock slope model with different dip angles of rock stratum and slope angles are simulated by Discontinuous Deformation Analysis (DDA) method. Results show that, when taking the release of the initial geo-stress into account, the slope dip and slope angle conditions required for triggering the slope toppling would decrease, and the lateral pressure coefficient plays a dominant role in the deformation trend. Under the same horizontal geo-stress conditions, more lateral pressure coefficient would induce greater overall deformation of slopes. When large horizontal geo-stresses exist, slope angles of up to 45° are recommended to ensure safety when the dip angle exceeds 60°. -
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