威后水电站拱坝坝肩抗滑稳定分析

发布时间：2018-05-28 02:18

本文选题：拱坝 + ABAQUS　；参考：《长春工程学院》2017年硕士论文

【摘要】：拱坝设计过程中,坝肩岩体稳定分析是至关重要的一个环节。如果坝肩岩体中存在断层、节理或者软弱夹层等不连续结构面,则有可能构成潜在的滑裂面,影响拱坝整体稳定,对下游人民生命财产安全造成危害。本文结合威后水电站工程开展研究工作。主要工作内容如下:1.归纳总结了拱坝坝肩岩体稳定分析方法,对比国内外拱坝设计规范对于抗滑稳定安全系数的规定,着重阐述弹塑性理论和非线性结构分析理论在拱坝坝肩稳定分析中的应用。2.采用拱梁分载法计算坝体对坝肩岩体产生的拱端推力值及方向,对坝肩岩体的滑动模式进行分析,运用刚体极限平衡法中的剪摩公式分析了威后水电站拱坝坝肩的稳定性。3.应用AB AQ US有限元分析软件对威后水电站拱坝整体结构建立三维模型,分析了正常蓄水位和校核洪水位工况下的坝体应力及位移;考虑拱坝坝肩岩体的材料非线性和断层接触非线性,用强度折减法和超载安全系数法对拱坝坝肩稳定性进行了分析。4.利用抗剪点安全系数法分析了威后水电站拱坝坝肩岩体潜在滑裂面上的局部(点)安全系数,画出点安全系数等值线图,判断坝肩岩体的局部稳定性。结果分析表明,威后水电站拱坝坝体应力、位移、坝肩岩体抗滑稳定满足规范要求。与刚体极限平衡法相比,强度折减法和超载安全系数法可以根据有限元分析得出的应变云图对潜在的最不利滑裂面做出更为直观的判断,对其采取有针对性的工程措施,有效节约工程成本。
[Abstract]:In the process of arch dam design, the stability analysis of abutment rock mass is very important. If there are discontinuous structural planes such as faults, joints or weak intercalations in the abutment rock mass, they may constitute a potential sliding crack surface, which may affect the overall stability of the arch dam and endanger the safety of the lives and property of the downstream people. In this paper, the research work is carried out in combination with the Weihou Hydropower Project. The main work is as follows: 1. The stability analysis method of arch dam abutment rock mass is summarized and compared with the safety factor of anti-slide stability of arch dam design code at home and abroad. The application of elastic-plastic theory and nonlinear structure analysis theory in stability analysis of arch dam abutment is expounded emphatically. This paper calculates the thrust value and direction of dam body to the abutment rock mass by the method of arch beam load, analyzes the sliding mode of dam abutment rock mass, and analyzes the stability of dam abutment of Weihou hydropower station by using the shear friction formula in rigid body limit equilibrium method. The three-dimensional model of the whole structure of the arch dam of Weihou Hydropower Station is established by using AB AQ US finite element analysis software, and the stress and displacement of the dam body under the condition of normal storage water level and checking flood water level are analyzed. Considering the material nonlinearity and fault contact nonlinearity of arch dam abutment rock mass, the stability of arch dam abutment is analyzed by strength reduction method and overload safety factor method. Based on the shear point safety factor method, the local (point) safety factor of the rock mass of the arch dam abutment of Weihou hydropower station is analyzed, and the contour map of the point safety factor is drawn to judge the local stability of the abutment rock mass. The results show that the stress, displacement and stability of dam abutment rock mass of Weihou Hydropower Station meet the requirements of the code. Compared with the rigid body limit equilibrium method, the strength reduction method and the overload safety factor method can make a more intuitive judgment on the potential most unfavorable sliding surface according to the strain cloud diagram obtained from the finite element analysis, and take targeted engineering measures. Save engineering cost effectively.
【学位授予单位】：长春工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV642.45

【相似文献】