基于时程分析法的拱坝坝肩临界滑动面搜索  

Searching for the Critical Clip Surface of an Arch Dam Abutment Based on the Seismic Time⁃History Method

作　　者：杨俊峰 徐扬升 王惠芹 徐强[2] 李少宜 杨军义 YANG Junfeng;XU Yangsheng;WANG Huiqin;XU Qiang;LI Shaoyi;YANG Junyi(Shaanxi Dongzhuang Water Control Project Construction Co.,Ltd.,Xi'an 710004,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China)

机构地区：[1]陕西省东庄水利枢纽工程建设有限责任公司,陕西西安710004 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [3]黄河勘测规划设计研究院有限公司,河南郑州450003

出　　处：《人民黄河》2023年第10期158-164,共7页Yellow River

基　　金：国家自然科学基金资助项目(U2243237);国家自然科学基金重大项目(52192672)。

摘　　要：拱坝坝肩的稳定性是分析拱坝安全稳定的重要内容。拱坝坝肩抗滑稳定经典计算方法需要假设拱坝坝肩滑块的底部滑动面,忽略了坝肩岩体中断层和裂隙节理组对坝肩抗滑稳定的影响。为了考虑岩体中断层和裂隙节理组的影响,基于时程分析法,利用遗传算法对坝肩抗滑临界滑动面进行搜索,并对坝肩滑块临界滑动面随地震烈度的变化情况进行分析。在对抗剪强度参数和地震动的敏感性上,研究了混凝土拱坝坝肩的抗滑能力。研究表明,结构面的摩擦系数对坝肩的抗滑稳定性影响较小,而坝肩的抗滑稳定性对岩桥上的黏聚力最为敏感,且黏聚力对抗滑稳定性的影响强于摩擦系数,地震动对拱坝坝肩抗滑稳定性影响较小。The stability of the arch dam shoulder is an important element in the analysis of the safety and stability of arch dams.The classical calculation method of arch dam shoulder slip resistance needs to assume the bottom sliding surface of the dam shoulder slider and ignore the influence of the fault and fracture joint group in the rock body of the dam shoulder on its shoulder slip resistance stability.In order to take into account the influence of faults and fracture joint groups to the rock mass,this paper used genetic algorithm to search for the critical sliding surface of the dam shoulder anti-slip based on the time course analysis method and analyzed the change of vibration intensity anywhere on the critical sliding surface of the dam shoulder slider.The slip resistance of the concrete arch dam shoulder was investigated in terms of sensitivity to shear strength parameters and ground vibration.The study result shows that the friction coefficient of the structural surface has less influ-ence to the slip resistance stability of the dam shoulder,while the slip resistance stability performance of the dam shoulder is most sensitive to the cohesive force on the rock bridge,and the influence of cohesive force to the slip resistance stability performance is stronger than that of the friction coefficient,and the influence of ground vibration to the slip resistance stability performance of the arch dam shoulder is weaker.

关 键 词：混凝土拱坝 耐震时程法 临界滑动面 

分 类 号：TV642.4[水利工程—水利水电工程]