库水位升降对堆石坝心墙的水平变形影响分析

发布时间：2018-11-05 10:32

【摘要】：为研究库水位升降对堆石坝心墙的水平变形影响,将土石坝心墙类比为竖直悬臂梁,上游侧受到上游坝壳不均匀的分布土压力和随时间变化的水压力,下游侧也同理受到下游坝壳相应土压力和水压力。研究表明:库水位上涨导致心墙发生向下游转动趋势,上游土压力逐渐减小,下游土压力逐渐增大,当二者分别达到主动土压力和被动土压力的极限状态时,土体即将产生滑动,定义此时的心墙挠度为理论心墙稳定挠度fs;若心墙实际水平位移量大于fs,则可以大致判定心墙两侧土体发生了相对滑动,可能导致产生局部纵向裂缝趋势。假设土石坝加固工程中采用的混凝土防渗墙的工况和条件类似,研究成果可直接应用于水平变形量计算并简单评估安全性。
[Abstract]:In order to study the effect of reservoir water level rise and fall on horizontal deformation of core wall of rockfill dam, the core wall of earth-rock dam is compared to a vertical cantilever beam, and the upstream side is subjected to uneven distribution of earth pressure in upstream dam shell and water pressure varying with time. The downstream side is also subjected to the corresponding earth pressure and water pressure of the downstream dam shell. The results show that when the water level rises, the core wall turns to the downstream, the upstream earth pressure decreases gradually, and the downstream earth pressure increases gradually, when both reach the limit state of active earth pressure and passive earth pressure, respectively. The deformation of the core wall is defined as the stable deflection of the theoretical core wall fs;. If the actual horizontal displacement of the core wall is greater than fs, the relative sliding of the soil on both sides of the core wall can be roughly determined, which may lead to the local longitudinal crack trend. Assuming that the working conditions and conditions of the concrete impervious wall used in earth-rock dam reinforcement project are similar, the research results can be directly applied to the calculation of horizontal deformation and simple evaluation of safety.
【作者单位】：中国水利水电科学研究院流域水循环模拟与调控国家重点实验室;
【基金】：国家科技支撑计划课题(2013BAB06B02) 国家重点基础研究发展计划暨973计划课题(2013CB036404) 中国水利水电科学研究院流域水循环模拟与调控国家重点实验室人才培育课题(岩实验室运行1402)和自主研究课题(岩实验室科研1412)
【分类号】：TV641.41

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