中文摘要：

为更好地解决实际工程中重力坝坝体混凝土材料与坝基岩体应力应变的非线性关系,提出材料非线性有限元分析方法,用于计算坝体的应力.首先运用ABAQUS软件中专门设置的初始地应力平衡步骤对算例坝基地应力进行平衡,验证在重力坝应力分析中施加初始地应力的正确性和精确性;然后运用ABAQUS软件中的混凝土损伤塑性本构模型和扩展Drucker-Prager模型对重力坝进行非线性分析.通过对线性和非线性计算结果进行比较,发现应用非线性有限元法计算的重力坝应力和位移结果要比线性的小,证明有限元的非线性分析更加适用于实际坝体应力分布和位移研究.

英文摘要：

In order to better deal with nonlinear stress-strain relationship between concrete of gravity dam and its foundation rock in practical engineering,a nonlinear finite element analysis method for heterogeneous materials was presented to calculate the stress in the dam.First using the initial ground stress balance procedure specifically set in software ABAQUS,the ground stress within an illustrative dam base was balanced,verifying the correctness and accuracy of imposion of initial ground stress in the process of stress analysis of gravity dam.Then,the plastic constitutive model for concrete damage and extended Drucker-Prager model in the software ABAQUS were used to analyze the nonlinearity of gravity dam.By means of comparison of linear with nonlinear analysis results,it was found that the results of stress and displacement of gravity dam obtained with nonlinear finite element analysis were less than those with linear analysis,verifying that the former was more appropriate to the investigation of stress distribution and displacement of the practical dam.