摘要:
国内最高的碧口土石坝及其坝下尚有国内最宽与最深的两道混凝土防渗墙,蓄水七年多来运行良好。应用改进的邓肯模型,对其作了施工期、蓄水期和稳定渗流期的有限元分析,获得了应力与位移场在运用过程中的演变情况,说明建筑物是安全的,也与尚有效的防渗墙观测资料基本相符。提出:今后在高土石坝设计中,应注意坝体中的荷载传递;混凝土防渗墙是强度接近临界状态的承压构件。
Abstract:
Bi-kou Dam, the highest earth and rockfill dam in China, and its two concrete cutoffs, one of which is the highest and the other is the widest, have been performing satisfactorily even since it impounded seven years, Using the modified Duncan Model, stress and displacement fields and their changesin construction, reservoir filling and steady seepage cases were analyzed with nonlinear finite element method. It conformed with operating observation data of cutoff and the safety of dam is proved. It is suggested that, when high earth and rockfill dams are designed,it should be paid attention to loading transfer in embankment and the concrete cutoff is compression support near critical condition.
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