【作者】 尤红兵；

【导师】 孙建恒；

【作者基本信息】 河北农业大学 ， 水利水电工程， 2002， 硕士

【摘要】 黄壁庄水库是全国病险库之一，为确保水库的安全运行，有必要对大坝进行安全鉴定。土石坝的应力应变分析，可找出坝体的应力和位移变化规律，确定拉应力区及剪切破坏区，判断可能形成裂缝的部位，为坝体的安全鉴定提供理论依据。本文对ANSYS进行了二次开发，利用APDL语言编制了土石坝二维线性、非线性静力有限元分析程序，非线性分析采用邓肯张E--B模型计算土石坝的应力和变形，结合坝体修建过程以及蓄水过程，采用中点增量法计算，对破坏的单元进行了无拉分析和剪坏处理；通过室内三轴试验，测定了黄壁庄水库主坝的邓肯张E-B模型的计算参数，并编写了相应的参数计算程序；根据土石坝动力计算的特点，开发了动力非线性计算程序，用于土石坝的地震反应分析，计算采用等效线性粘-弹性模型，此模型以线性粘弹性理论为基础，同时考虑了土体的非线性性质。ANSYS程序使用Newmark时间积分方法求解动力方程。通过算例，对程序全部进行了验证，所编程序可靠、准确。利用这些程序对黄壁庄水库主坝进行了线性、非线性静力、非线性动力分析计算，主坝坝体的应力、位移分布符合一般规律，在地震作用下主坝的动力反应较弱，对大坝的安全影响不大。所有计算分析表明，黄壁庄水库主坝的安全是可以得到保证的，为坝体的安全鉴定提供了理论依据。更多还原

【Abstract】 Huangbizhuang Reservoir is one of the reservoirs which are prone to dangers and accidents. To ensure its safe working , it is necessary to appraise the dam’s safety. According to the stress-strain analysis of the dam, the law of the stress and strain change can be found. Based on the stress or shear failure section, the location where the cracks will appear can be defined. Thus,the safety of the dam can be appraised. By using APDL language, the linear and nonlinear finite element method programs for static analysis of dam are developed in this paper. Duncan-Chang E-B Model is adopted in the nonlinear analysis. On the basis of the process of the construction and water conservancy , the method of midpoint increment is used in the calculation . The solutions of some failed elements are adjusted through no-tensile-stress analysis or shear-failure disposal. Besides, Duncan-Chang E-B Model parameters of materials have been determined by the triaxial shear test in the laboratory. Data processing program and parameter calculation program by APDL language are also developed. Furthermore, according to the characteristics of the dynamic calculation, nonlinear finite element method program is developed to calculate the dynamic response analysis of dam . The equivalent linear viscosity-elasticity model is adopted in the calculation. This model not only bases on the linear viscosity-elasticity theory but also considers the nonlinear nature of soil. The full method uses the full system matrices to calculate the transient response and the Newmark time integration technique is used to solve the dynamic equation in ANSYS program. The calculation examples show that the solution is highly accurate; all the programs are proved to be credible and satisfactory. By using these programs, the linear, nonlinear static analysis and nonlinear dynamic analysis of the Huangbizhuang major dam are finished. The distributions of the stress and strain have been worked out; the stress and displacement accord with the general rule. The dynamic response is very weak. The whole calculation and analysis can prove the safety of the major dam, and these provide the theoretical foundations for the Dam’s Safety Appraisal Work.更多还原