混凝土传力抗剪结构在拱坝坝肩加固处理中的效果分析  

Analysis on Effect of Concrete Transmission and Shear Resistance Structure in Arch Dam Abutment Reinforcement

作　　者：杨庚鑫[1] 陈建叶[1] 张林[1] 杨宝全[1] 胡成秋[1] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室水利水电学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2013年第3期34-39,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：博士学科点专项科研基金资助项目(20100181110077);国家"973"重点基础研究发展计划资助项目(2010CB226802);国家自然科学基金资助项目(50879050;51109152)

摘　　要：针对影响小湾水电站坝肩稳定的不良地质构造,设计上拟定了以混凝土洞塞为主的系统治理方案,特别是在近左拱端的1 210 m高程构建"牙刷状"的传力抗剪结构来提高坝肩的整体抗变形能力。为对混凝土洞塞的加固措施进行效果评价,针对小湾拱坝1 210 m高程的不良地质构造,采用地质力学模型试验方法,模拟了坝肩1 210m高程岩体中的断层、蚀变带、坝肩强卸荷岩体及混凝土传力抗剪结构等,进行天然地基方案和加固地基方案的超载法破坏试验对比分析研究。试验表明:对坝肩进行加固处理之后,坝肩变位有一定程度的减少,破坏形态有所改善,超载系数由KP=2.2提高到KP=3.0～4.0。证明了这种加固处理措施具有改变拱端推力的传递方向、增强坝肩整体抗变形能力等综合作用,是行之有效的加固处理措施。研究成果可对类似坝肩稳定问题提供经验和借鉴。In view of the worse geological structure in Xiaowan high arch dam abutment at EL. 1210 m, a geomechanical model was used to simulate its geological structure. Through overloading failure test, the failure mechanism of natural foundation and strengthening foundation was compared. The test results showed that after taken reinforcement measure, the dam abutment displacement becames less, damage area reduces, overload coefficient KP is improved from 2.2 to 3.0~4.0. According to the test results, it was proved that this reinforcement measures can change transfer direction of the thrust and enhance deformation ability. The proposed design method is not only helpful to ensure the stability of the dam abutment, but also provides valuable experiences for the reinforcement of the dam abutment in similar projects.

关 键 词：拱坝坝肩稳定 地质力学模型试验 传力抗剪结构 破坏机理 加固措施评价 

分 类 号：TV321[水利工程—水工结构工程]