直苴混凝土面板堆石壩三維應力—變形分析及面板配筋優(yōu)化
[Abstract]:The concrete face rockfill dam is impervious with thin face slab. In the past 20 years, this type of dam has made great progress in adapting to various complicated terrain and geological conditions, aseismic performance, construction quality control and inspection technology. The most important component of concrete faced rockfill dam is rockfill, and its deformation has great influence on the stability and safety of the dam. Due to the deformation and uneven settlement of the dam body, some of the rockfill dams have been built, resulting in a large number of leakage, which has a great impact on the normal operation of the dam. Therefore, it is necessary to study the stress-deformation of concrete face rockfill dam. In this paper, the finite element numerical calculation of concrete face rockfill dam is carried out, which mainly includes the following contents: 1. The 3D finite element model of concrete face rockfill dam is established by using the large finite element ANSYS software. The seepage analysis of the concrete face rockfill dam is carried out by using the ANSYS heat module under various characteristic water levels. The seepage discharge of the concrete face rockfill dam under each characteristic water level condition is calculated, and the infiltration line inside the dam body under each characteristic water level condition is determined. It provides the premise for the stress and strain finite element analysis of the face slab of the face rockfill dam; 2. The calculation program of Duncan-Chang constitutive model with finite element software ANSYS is developed. The application of the constitutive model program to the analysis of 3D face rockfill dam shows that the constitutive code of soil material can not only calculate the credible stress and deformation results of dam body. It also overcomes the shortage of many large-scale finite element software which lacks the constitutive model of soil material, and avoids the manpower and time of compiling a whole set of finite element program for earth and rockfill dam analysis. 3. The stress-deformation characteristics of concrete slabs are numerically calculated, and the simulation results are in agreement with the previous literatures and the measured results. 4. The influence of stress and deformation of concrete slab on longitudinal reinforcement ratio of 0.30% to 0.45% is studied, and the optimal reinforcement ratio of longitudinal steel bar of concrete slab is calculated by BP neural network optimization algorithm.
【學位授予單位】:昆明理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TV641.43
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