降雨及库水位变动对向阳水库岸坡稳定性的影响研究  

Influence study of rainfall and reservoir level fluctuations on stability of Xiangyang Reservoir bank slope

作　　者：黄贵[1] 付敬[2] 卢增木 张雨霆[2] HUANG Gui;FU Jing;LU Zengmu;ZHANG Yuting(Gongming Water Supply and Storage Project Management Department,Water Authority of Shenzhen Municipality,Shenzhen 518036,China;Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China;Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China)

机构地区：[1]深圳市水务局公明供水调蓄工程管理处,广东深圳518036 [2]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010 [3]长江勘测规划设计研究有限责任公司,湖北武汉430010

出　　处：《水利水电快报》2025年第1期61-67,共7页Express Water Resources & Hydropower Information

基　　金：中央级公益性科研院所基本科研业务费(CKSF20241015/YT);北京江河水利发展基金会水利青年科技英才项目(JHYC202305)。

摘　　要：在水的作用下,岸坡内地下水渗流场和岩土体力学性质发生变化,从而影响岸坡的整体稳定性。以重庆市向阳水库平进村岸坡工程为例,基于非饱和流固耦合理论、弹塑性理论和强度折减法,采用有限差分方法,分析在降雨工况、库水位升降等多种工况条件下平进村Ⅱ级缓坡的滑移破坏模式和安全系数变化规律,评价在岸坡前缘段采取压脚治理措施的防护效果。结果表明:①在不同工况下,岸坡均存在3种潜在滑移模式,即坡表覆盖层滑移、沿浅层软弱夹层滑移以及沿深层破碎夹层滑移。②岸坡天然地下水位埋深浅,当遭遇极端降雨时,大量雨水入渗将引起地下水位上抬,坡体有效应力降低,抗剪能力削弱,导致边坡稳定性明显降低。③采取前缘压脚防护措施可有效提高岸坡整体稳定性,压脚前后岸坡多滑移模式的安全系数提高约0.01~0.30。Under the action of water,the seepage field of groundwater and the mechanical properties of rock and soil on the bank slope undergo changes,thereby affecting the overall stability of the bank slope.Taking the bank slope project of Pingjin Village,Xiangyang Reservoir in Chongqing City as an example,based on the unsaturated fluid structure coupling theory,elastic-plastic theory,and strength reduction method,and used finite difference method to analyze the sliding failure mode and safety factor change law of Pingjin Village GradeⅡgentle slope under various working conditions such as rainfall and reservoir water level changes.The efficacy of the surcharge measures applied at the toe of the bank slope for erosion protection was assessed.The results indicated that:①There were three potential slip modes on the bank slope under different working conditions,namely slip along the slope surface cover layer,slip along shallow weak interlayers,and slip along deep fractured interlayers.②The natural groundwater level on the bank slope was relatively low,when encountering extreme rainfall,a large amount of rainwater infiltration would rise the groundwater level,the effective stress of the slope would be reduced,the shear resistance would be weakened,and the stability of the slope would be significantly reduced.③The adoption of leading edge foot pressure protection measures could effectively improve the overall stability of the bank slope,and the safety factor of multiple sliding modes after the foot pressure was increased by about 0.01 to 0.30.

关 键 词：水库岸坡 蠕动变形 降雨入渗 强度折减方法 向阳水库 

分 类 号：TV223[水利工程—水工结构工程]