库水位下降条件下降雨对复杂堆积体岸坡稳定性的影响研究

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中图分类号：TV697. 2+3 文献标识码：A 文章编号：1001-9235（2025）08-0098-10

Influence of Rainfall on Stability of Complex Accumulated Bodies on Bank Slopes under Condition of Reservoir WaterLevel Drop

LI Chao’，LIU Kongzhen'，FU Kangl， ZENG Yanjie’，KANYi，LIU Xiaoqing （1.SichuanHuanengBaoxingiverHropoerCotd，Yan6o，na;2holofEergndowrEnginga University，Chengdu610039，China）

Abstract：RainfallandreservoirwaterleveldroparethedominantfactorsaffectingthebankslopestabilityofreservoirsTereisa lackofresearchonthedisaster-formingprocessofomplexaccumulatedbodiesonbankslopesunderthecombinedefectofrainal andwaterleveldrop.Inthesudybasedontheteoryofunsaturatedseepageandunsaturatedsoilshearstrength，anaccuulated bodyonbank slopesofreservoirs wasstudied，andnumericalsimulationmethdswereusedtoinvestigatetheombiedfectoftrong rainfallandreservoirwaterleveldroponthestabilityofthecomplexaccumulatedbodiesonbankslopes.Theresultsshowthatthe rainfall types affecting the stability of accumulated bodies on bank slopes areas follows： average type > forward-peak type > backwardpeak type > central-peak type. The combined effect of rainfall （ ⩽30mm/d ）and reservoir water level drop Ω（⩽1.0m/d ） does not affect thestabilityof thebank slope，andthereisnolandsliderisk．Onthe23rdand1stdaysaftertherainfallatintensitiesof 90mm/d （20 （heavy rain） and 150mm/d （rainstorm），respectively，the stability coeffcient of the bank slope decreases significantly，and the value is closetoorlessthanthecriticalvalue.Tereisariskoflandsldes.Moreoverainfallisakeyfactoraectingthestabilityofthe accumulatedbodiesonbankslopes，andthedcreaseinwaterlevelisasecondaryfactoraceleratingbankslopeinstabilityThe researchresultshavecertainengineringsignificanceforthedevelopmentoflandslidedisasterpreventionschemesandreservoir operation measures on the complex accumulated bodies on bank slopes.

Keywords：accumulatedbodyonbankslope;rainfallreservoirwaterlevel;bankslopestability;stabilitycoefcient;porewater pressure

随着中国水电事业的高速发展，高坝大库相继建成并投入运行，库岸边坡或大坝坝坡在降雨和库水位变化作用下，水的渗透使得岩土体从非饱和向饱和的状态发展，导致岩土体强度降低，发生库岸坍塌和滑坡现象，影响水利工程的正常运行，甚至危及库区生态环境安全和坝下游居民的生命财产安全[1-3]。（剩余9837字）