库水位变化对岩质边坡稳定性影响的数值分析

发布时间：2018-04-24 10:22

本文选题：岩质边坡 + 水位变化　；参考：《人民黄河》2017年11期

【摘要】：以某水库库岸边坡为研究对象,基于强度折减理论,采用有限差分法FLAC3D对库岸边坡稳定性进行数值分析计算,利用fish语言编程建立位移与折减系数关系,将位移不连续作为边坡失稳判据。进而得出随库水位上升,边坡位移逐渐增加,在1/8~3/8满水位下边坡位移增加不明显,水位上升至满水位的6/8后边坡位移变化趋缓,对应的水位为126 m库岸边坡临界稳定水位。基于试验数据拟合出饱水-失水循环次数n与岩石强度指标的关系,得出水位的循环变化对边坡稳定性影响较大,且最低变化水位线越高边坡的安全系数变化越明显,水库蓄水、放水过程中最高水位不应超过满水位的6/8,建议为满水位的1/2左右。
[Abstract]:Taking the slope of a reservoir bank as the research object, based on the strength reduction theory, the finite difference method (FLAC3D) is used to analyze and calculate the stability of the bank slope of the reservoir. The relationship between displacement and reduction coefficient is established by fish programming. The discontinuity of displacement is regarded as the criterion of slope instability. It is concluded that the slope displacement increases gradually with the rise of reservoir water level, and the slope displacement does not increase obviously at the full water level of 1 / 8 / 3 / 8. The slope displacement changes slowly after the water level rises to 6 / 8 of the full water level, and the corresponding water level is the critical stable water level of the bank slope of 126m reservoir. Based on the experimental data, the relationship between water saturation and water loss cycle number n and rock strength index is fitted. It is concluded that the cyclic change of water level has a great influence on slope stability, and the higher the water level line is, the more obvious is the change of safety factor of slope. The maximum water level of the reservoir should not exceed 6 / 8 of the full water level during the discharge process, and it is suggested that the maximum water level should be about 1 / 2 of the full water level.
【作者单位】：华陆工程科技有限责任公司;
【基金】：国家自然科学基金青年科学基金项目(41402265)
【分类号】：TV223;TV697

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