节理岩体力学性能不确定性分析方法研究

发布时间：2019-02-18 12:26

【摘要】：基于连续介质损伤力学框架,通过损伤张量和有效应力来描述节理岩体的力学性能,自主研发了基于损伤力学模型的有限元程序(CD-FEM),用于节理岩体等效力学性能研究。同时,采用Karhunen-Loeve(K-L)展开来分解随机输入场,用混沌多项式来表示随机输出场,采用概率配点法生成配点,再由连续损伤有限元分析系统CD-FEM求解确定性方程组,最终得到输出域的统计数据,从而提出了一种将随机分析与基于连续损伤力学模型的数值分析方法解耦进行节理岩体不确定性力学行为分析的方法。利用该方法,对一典型节理岩体在加载条件下的力学行为进行不确定性分析,并与蒙特卡罗方法进行对比,结果表明,所提方法的计算量大大减少,极大地提高了节理岩体力学性能不确定性分析的效率,可应用于对节理岩体在不同载荷条件下的不确定性进行分析。
[Abstract]:Based on the damage mechanics framework of continuous medium, the mechanical properties of jointed rock mass are described by damage Zhang Liang and effective stress. A finite element program (CD-FEM) based on damage mechanics model is developed to study the equivalent mechanical properties of jointed rock mass. At the same time, the Karhunen-Loeve (K-L) expansion is used to decompose the random input field, the chaotic polynomial is used to represent the random output field, the probability collocation method is used to generate the collocation points, and the continuous damage finite element analysis system (CD-FEM) is used to solve the deterministic equations. Finally, the statistical data in the output domain are obtained, and a method of decoupling random analysis and numerical analysis method based on continuous damage mechanics model to analyze the uncertain mechanical behavior of jointed rock mass is proposed. By using this method, the mechanical behavior of a typical jointed rock mass under loading condition is analyzed with uncertainty, and compared with the Monte Carlo method, the results show that the computational complexity of the proposed method is greatly reduced. The efficiency of uncertainty analysis of mechanical properties of jointed rock mass is greatly improved, which can be used to analyze the uncertainty of jointed rock mass under different load conditions.
【作者单位】：内蒙古阿拉善左旗水利工作队;
【分类号】：TU452

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