“坝前淤积面加坝”边坡稳定性分析上限解

doi:10.13722/j.cnki.jrme.2022.0525

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摘要西北黄土丘陵山区通常采用“坝前淤积面加坝”进行水库除险加固施工，涉及不同固结状态土体和多个软弱结合面的“复合土坝”稳定性分析问题。文中针对“复合土坝”的结构型式和水库运行特点，基于极限分析上限定理，构建2种运动许可的破坏机制，给出考虑库水位动态变化引起的坝坡静水压力和坝体孔隙水压力效应的边坡稳定分析上限解，采用强度折减法并结合序列二次规划法进行边坡安全系数的寻优计算。在此基础上，以宁夏南部黄土丘陵山区“坝前淤泥面加坝”的水库除险加固工程为算例，对比分析文中上限解与Optum-G2和Geo-studio数值模拟计算结果。研究表明，当库水位由设计水位骤降至死水位时，2种破坏机制的上限解与数值模拟值非常接近，安全系数的相对误差≤5.7%；改变淤泥–新填土软弱结合面宽度，破坏模式亦随之变化；平动破坏时，软弱结合面宽度与边坡安全系数呈近似线性关系，宽度每增加1 m，安全系数约提高2.7%；转动–平动破坏时，坡比与边坡安全系数亦呈近似线性变化，坡比每增加0.1，边坡安全系数约降低8.6%。本文方法简单、快捷，适宜在此类工程中应用。

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	王红雨1
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	闫超1
	曹静1

关键词 ：土力学, 坝前淤积面加坝, 破坏机制, 极限分析上限解, 水力效应, 稳定性分析

Abstract：The stability analysis problem of the composite earth dam with multiple weak joints composed of soils in different consolidation states will be encountered when adopting the method of filling earth from upstream deposited silt which be common in northwest loess hill region for the reinforcement of the reservoir. Based on the upper bound theorem of plastic mechanics limit analysis，two destruction mechanisms have been constructed with the slope of filling earth from deposited silt as the research object that according to the structural type of composite earth dam and the operating characteristics of the reservoir. Then，considering the influence of the static water pressure of the dam slope and the pore water pressure in the earth caused by the dynamic change of the reservoir water level，the safety factors have been analyzed and optimized by using strength reduction technology and SQP method. On this basis，taking the reservoir reinforcement project of filling earth from upstream deposited silt from Ningxia southern mountainous area as a case，the upper limit solution of this paper and the numerical simulation results of Optum-G2 and Geo-studio have been compared and analyzed. The research results show the upper limit solutions of the two destruction mechanisms are very close to the numerical simulation values and the relative error of the safety factor is less than or equal to 5.7% when the reservoir water level drops sharply from the design water level to the dead water level. The failure mode change with the width of the weak interface of silt and new fill. The slope safety factor shows a nearly linear relation with the weak interface width variation that the safety factor will be increased about 2.7% as add every 1 m of interface width when the dam slope fails in translation. And the slope safety factor also has a nearly linear relation with the slope ratio variation that the slope safety factor will be reduced about 8.6% as add every 0.1 of slope ratio under rotation-translation combined failure conditions. The upper bound solution that presents in this paper is simple，convenient and suitable for the type of problem.

Key words： soil mechanics filling earth from upstream deposited silt destruction mechanism upper bound solution hydraulic effect stability analysis

引用本文:

王红雨1，2，闫超1，曹静1. “坝前淤积面加坝”边坡稳定性分析上限解[J]. 岩石力学与工程学报, 2023, 42(S1): 3578-3588.
WANG Hongyu1，2，YAN Chao1，CAO Jing1. Upper bound solution of slope stability analysis for“filling earth from #br# upstream deposited silt”. , 2023, 42(S1): 3578-3588.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0525 或 https://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3578

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