【作者】 赖道平；

【导师】 顾冲时； 吴中如；

【作者基本信息】 河海大学 ， 水工结构工程， 2005， 博士

【摘要】 本文针对运行期坝基坝肩地质缺陷体对大坝结构性态演变和转异的影响问题，系统研究了地质缺陷对大坝结构性态影响相关的分析模型和方法，利用这些模型和方法探索了地质缺陷对大坝结构性态演变和转异的影响规律，同时还研究了大坝结构性态转异诊断的新方法。本文主要内容如下： (1) 研究了对大坝安全产生不利影响的地质缺陷的性质，应用系统工程的方法和理论，建立了缺陷体对重力坝和拱坝演变转异的系统地质-工程-力学模型。基于监测资料和Elman回归神经网络，提出了建立地质缺陷体演变时序模型的方法，并对提出的方法进行了实例验证。 (2) 提出了有厚度和无厚度地质缺陷的非线性蠕变模型，推导了模拟上述地质缺陷蠕变的有限元增量表达式。 (3) 探讨了结构面的损伤蠕变，提出了结构面损伤蠕变模型；推导了结构面和等效连续介质的蠕变耦合公式，建立了混合介质的蠕变与渗流耦合模型，研制了混合介质蠕变与渗流耦合的有限元程序。 (4) 基于上述提出的分析模型，结合实际工程，通过数值模拟研究了缺陷体影响拱坝变形和应力演变的机理，探究了地质缺陷的强度、流变、渗流对拱坝变形演变和裂缝形成的影响规律。 (5) 基于分形学理论、遗传模拟退火算法、偏最小二乘法和数据融合方法，提出了三种大坝结构性态转异诊断的方法，并进行了实例验证。更多还原

【Abstract】 Owing to the significant influence of geological defects on evolution and variation of concrete dams, many models and methods pertinent to the problem are presented in this work. And how geological defects influence on evolution and variation of concrete dams are studied by applying the models and methods presented. At the same time, some methods are presented to diagnose the behavior variations of the dams. The main contents are as follows.(1) The engineering characters of geological defects detrimental to dam safety are investigated. Based on the investigation, the systematic geology-engineering-mechanics models are built up to evaluate the geological defects’ influence on the evolution and variation of the gravity dam and arch dam. Then by use of monitoring data and Elman recurrent neural networks, the method to build up time series evolution model of geological defects is presented. And the application indicates that the method is effective.(2) Nonlinear rheological models of thick and zero-thickness structural planes are presented. And incremental expressions of finite element for simulating creep of the structural planes are derived.(3) Damage-reheological characters of rock structural planes are discussed, and the damage-reheological model for them is presented. Coupled creep and seepage equations for structural planes and equivalent continuum medium are derived. Creep and seepage coupled model for hybrid medium is presented, and FEM program for the coupled model is developed.(4) Deformation and stress evolution mechanism of gravity arch dams under the influence of geological defects is drawn out by the above numerical methods. And the rules how the strength, creep and seepage of geological defects influence on deformation and cracks evolution of the dams are derived.(5) Based on fractal theory, partial least squares, genetic simulated annealing algorithm and data fusion methods, three methods are presented to diagnose dam variation. And the methods are proved to be effective by the applications.更多还原