【作者】 王千；

【导师】 苏超；

【作者基本信息】 河海大学 ， 防灾减灾工程及防护工程， 2005， 硕士

【摘要】 本文以龙滩工程为对象,运用非线性有限元分析方法和工程类比方法,对龙滩工程围岩稳定、支护参数和开挖顺序进行了研究,具体工作有: 1、详细阐述了岩体的组成结构和围岩建模理论,总结了国内水电站地下厂房地质模型概化情况。根据龙滩工程的具体地质条件,运用工程类比的方法,确立了其地质概化模型 2、通过对岩体非线性理论阐述和国内部分水电站地下厂房数值分析中所采用本构关系统计分析的基础上,对龙滩工程的非线性有限元分析采用了合适的屈服准则。 3、对龙滩地下洞室群进行了7种工况的非线性有限元计算,通过洞室围岩的位移、应力和拉损破坏区的分布情况及这些物理量随开挖过程的变化规律,对洞室群围岩的稳定情况进行了研究。 4、通过5种工况的计算对岩体的变形模量和泊松比,岩体的c、φ值进行了敏感性分析;通过2种典型开挖方式的比较,分析了开挖顺序对围岩稳定和支护参数的影响。 5、以三个主要断面的计算成果和有无支护情况下支护参数的计算分析,肯定了设计支护工况情况下对断层、裂隙的良好加固效果;又通过国内外地下厂房支护情况的统计、分析和对比,给出龙滩工程的支护参数改进建议。更多还原

【Abstract】 In this paper, the author studied adjacent rock stability, support parameters and excavation sequence of LongTan project by using the method of nonlinear finite element and engineering analogism. The job includes:1. Elaborating the structure of rock composition and the theory of building model about adjacent rock in detail, summarizing the general situation of geological model of underground workshops about hydroelectric stations in China, the author established the geological general model of LongTan project according to its specific geological condition by using the method of engineering analogism.2. Basing on expounding the nonlinear theory about rock and statistical analysis of constructive relations used by partial underground workshops about hydroelectric stations in China, the author used proper yielding criterion in nonlinear finite element analysis in LongTan project.3. Carried out nonlinear finite element calculation at the different of 7 operating cases for LongTan underground caves and studied the steady condition of the adjacent rock of the caves by the distribution of stress, displacement, damage district about adjacent rock and their change law during excavation.4. Carried out sensitivity analysis of distortion module, Poisson ratio and c , <p value ofrock by the calculation at the different of 5 operating cases; studied the influence of excavation sequence on adjacent rock stability and support parameters through comparison among the 2 typical ways of excavation.5. We can affirm the design of support has an evidence effect on the reinforcing faultage and cranny by the result of calculating three major sections and analysis of support parameters with and without supports, give suggestion about how to improve support parameter of LongTan project through statistic, analysis and comparison of support parameters of underground workshops in home and abroad.更多还原