锦屏一级高拱坝整体稳定物理与数值模拟综合分析

发布时间：2018-05-15 21:03

本文选题：高拱坝工程 + 整体稳定性　；参考：《水利学报》2017年02期

【摘要】：高拱坝的整体稳定是工程建设中的关键问题之一,地质力学模型试验和数值计算是研究这一问题的重要方法。通过理论推导建立了基于综合法的大坝稳定安全系数评定关系式。针对锦屏一级高拱坝坝肩地质条件复杂,影响拱坝整体稳定的断层、岩脉、节理裂隙众多,坝高库大和加固难度大,工程安全稳定问题十分突出等特点,采用综合法地质力学模型试验与三维非线性有限元相结合的方法,对加固处理后的锦屏一级高拱坝整体稳定性开展研究。获得了拱坝在正常工况下的工作性态,以及在结构面强度参数降低约30%后坝肩的超载变形失稳过程和最终破坏形态,提出拱坝与地基综合法整体稳定安全度为5.2~6.0(试验值)和5.98(计算值)。通过综合分析模型试验和数值计算的成果,评价了锦屏一级高拱坝工程的安全性和加固效果。研究成果为锦屏一级拱坝工程的安全监测和运行管理提供了科学依据,同时也为其他类似高拱坝工程的稳定分析提供参考。
[Abstract]:The overall stability of high arch dam is one of the key problems in engineering construction, and the geomechanical model test and numerical calculation are the important methods to study this problem. By theoretical derivation, the evaluation formula of dam stability safety factor based on comprehensive method is established. In view of the complex geological conditions of the abutment of the first grade high arch dam in Jinping, the faults affecting the overall stability of the arch dam, the numerous veins and joints, the large reservoir height of the dam and the difficulty of reinforcement, the safety and stability problems of the project are very prominent. By using the method of comprehensive geomechanical model test and 3D nonlinear finite element method, the overall stability of Jinping grade I high arch dam after reinforcement is studied. The working behavior of the arch dam under normal working conditions and the failure process and ultimate failure mode of the abutment under overload deformation are obtained after the strength parameters of the structure surface are reduced by about 30%. It is put forward that the overall stability and safety degree of the comprehensive method of arch dam and foundation are 5.2 ~ 6.0 (test value) and 5.98 (calculated value). Through comprehensive analysis of model test and numerical calculation results, the safety and reinforcement effect of the first grade high arch dam in Jinping are evaluated. The research results provide a scientific basis for the safety monitoring and operation management of the first grade arch dam project in Jinping, and also provide a reference for the stability analysis of other similar high arch dam projects.
【作者单位】：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;诺丁汉大学诺丁汉岩土力学中心工程学院;
【基金】：国家自然科学基金项目(51409179,51379139) 四川大学“优秀青年教师海外访学计划”项目
【分类号】：TV642.4

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