深厚覆盖层上高土石坝基础廊道环向结构缝设置研究  

Research on the Circumferential Structural Joints in the Foundation Gallery of the High Rockfill Dam on Deep Overburden

作　　者：朱祖国 王占军 潘家军[4] 徐晗[4] ZHU Zu-guo;WANG Zhan-jun;PAN Jia-jun;XU Han(Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430010,Hubei Province,China;National Dam Safety Research Center,Wuhan 430010,Hubei Province,China;State Key Laboratory Resources Engineering and Management,Wuhan 430072,Hubei Province,China;Yangtze River Scientific Research Institute,Wuhan 430010,Hubei Province,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430010 [2]国家大坝安全工程技术研究中心,湖北武汉430010 [3]水资源工程与调度全国重点实验室,湖北武汉430072 [4]长江水利委员会长江科学院,湖北武汉430010

出　　处：《中国农村水利水电》2025年第4期97-101,共5页China Rural Water and Hydropower

基　　金：长江勘测规划设计研究有限责任公司自主创新项目(CX2020Z47,CX2022Z36)。

摘　　要：深厚覆盖层上高土石坝基础廊道环向结构缝作为坝基防渗的薄弱部位,其受力和变形均较复杂,是坝基廊道设计的关键技术难点。通过建立深厚覆盖层上高土石坝三维有限元数值模型,对比研究了基础廊道环向结构缝不同分缝位置对大坝防渗体系应力变形的影响,揭示了环向结构缝部位的应力变形性态,并据此提出了环向结构缝设置建议。研究表明:环向结构缝的不同分缝位置对坝体及其沥青混凝土心墙整体的应力变形基本无影响,对坝基防渗墙的变形极值没有影响,受端部支承效应影响,防渗墙两岸局部出现拉应力;随着嵌入岸坡岩体深度增加,坝基廊道嵌入端顺流向拉应力增加明显,坝轴向和竖直向拉应力仅略微变化,坝基廊道压应力逐渐减小;建议坝基廊道嵌入两岸山体一定深度(一般不少于2m),环向结构缝设置不少于2道“W”型结构铜止水,廊道与基岩之间宜设置弹性垫层。As the weak part of seepage prevention of dam foundation,the torus structural joint of foundation gallery of high earth-rock dam on deep overburden is complicated in force and deformation,which is the key technical difficulty in the design of foundation gallery.Firstly,a three-dimensional finite element numerical model of the high rockfill dam on deep overburden was established.Secondly,the effects of different division positions of the circumferential structural joints on the stress and deformation of the anti-seepage system of the dam was compared,and the stress and deformation patterns at the joint location was revealed.Finally,some suggestions for the circumferential structural joints were proposed.The results showed that the different positions of the circumferential structural joints have little effect on the stress and deformation of the dam body and the asphalt concrete core wall as a whole,and have no effect on the maximum deformation of the dam foundation anti-seepage wall.Due to the end support effect,local tensile stresses near on the wall of the seepage wall on both sides of the foundation.When the depth of the foundation trench embedded in the bank slope rock increases,the longitudinal and vertical tensile stresses in the foundation trench at the embedded end increase significantly,while the axial and vertical compressive stresses change insignificantly.The compressive stresses in the three directions gradually decrease.The foundation trench should be embedded in the mountain body on both sides of the dam to a certain depth(usually not less than 2m),and at least two W-shaped structural copper stopwater should be set in the circumferential structural joint.The elastic cushion layer should be installed between the dam foundation gallery and bedrock in the bank slope rock mass section.

关 键 词：高土石坝 坝基廊道 环向结构缝 有限元分析 应力变形 设置建议 

分 类 号：TV543[水利工程—水利水电工程]