渗流–水跃共同作用下闸下连接段稳定性分析

doi:10.13722/j.cnki.jrme.2015.1323

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摘要水跃的发生使得底板上压重减少，导致无孔底板稳定性下降。常规分析方法忽略此因素往往导致偏危险的结果。考虑渗流–水跃共同作用下斜坡连接段受力分析方法主要包括斜坡水跃定位方法和二维有限元中排水孔等效处理方法，应用该方法分析某水闸消力池斜坡连接段底板水毁原因，讨论其修复措施和效果，指出忽略水跃的静作用是导致此次水毁的根本原因。考虑水跃作用后，连接段稳定性随上下游水位和过坝流量的变化而呈变化较大。在底板上设置排水孔可消除水跃的不利影响。当设置足够多的排水孔后，底板进行稳定性分析时可不考虑水跃的作用而按常规的方法进行，结果偏保守。

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	骆冠勇1
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关键词 ：渗流力学, 水跃, 水闸, 稳定性, 有限元

Abstract：Occurrence of a hydraulic jump can reduce the balance weight of a slab in a stilling basin. Ignoring them would result in a dangerous situation. In this paper，a slab failure case，which occurred in Guangzhou is examined carefully by numerical simulation. The method to locate a hydraulic jump and that to simulate the draining holes were addressed in details. The restoration and its effect is also discussed. It found that，(1) the occurrence of a hydraulic jump both reduces the balance weight of a slab and changes boundary condition for seepage flow significantly. (2) It is the ignoring the static effect of a hydraulic jump that makes the failure happen. (3) Draining holes in the slab reduce the water pressure difference between the top and bottom and eliminate the static effect. (4) For a slab with draining holes，stability analysis without taking into account the hydraulic jump static effect is acceptable for its result is on the safe side.

Key words： seepage mechanics hydraulic jump sluice stability finite element method(FEM)

引用本文:

骆冠勇1，2，曹洪1，2，潘泓1，2. 渗流–水跃共同作用下闸下连接段稳定性分析[J]. 岩石力学与工程学报, 2016, 35(S2): 4196-4204.
LUO Guanyong1，2，CAO Hong1，2，PAN Hong1，2. The slab instability of a stilling basin caused static effect of hydraulic jump. , 2016, 35(S2): 4196-4204.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.1323 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/4196

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