岩体弹塑性模型力学参数对位移的影响度研究  

STUDIES OF INFLUENCE DEGREE OF MECHANICAL PARAMETERS ON DISPLACEMENTS IN ELASTO-PLASTIC MODEL FOR ROCK MASS

作　　者：丁德馨[1] 杨仕教[1] 孙钧[2] 

机构地区：[1]南华大学建筑工程与资源环境学院,衡阳421001 [2]同济大学结构工程学院,上海200092

出　　处：《岩石力学与工程学报》2003年第5期697-701,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金(50274043);湖南省自然科学基金(01JJY1004);湖南省教育厅重点资助项目(01A015)

摘　　要：弹塑性位移反分析可归结为对一个极值问题的优化求解。但在求解该极值问题前,须先确定其目标函数的影响因素,即确定弹塑性位移反分析问题的可反演参数。采用连续介质快速拉氏分析(FLAC)对地下采场进行数值模拟计算,采用正交试验设计法确定模拟计算方案,采用数理统计分析法研究岩体弹塑性模型力学参数对地下采场顶板中点坚向位移及侧帮中点水平位移的影响度,建立了影响度评价方法,确定了弹塑性位移反分析问题的可反演参数。Back analysis of displacements for the mechanical parameters of an elasto-plastic model for rock mass can be included to an optimization problem. However, before solving the problem, the mechanical parameters influencing the objective function of the problem have to be identified. That is, the mechanical parameters, which can be determined by back-analyzing the displacements in the elasto-plastic model for rock mass, have to be recognized. The Fast Lagrangian Analysis of Continua (FLAG) is used to conduct numerical simulation on displacements around an underground stope. The test design approach on orthogonal table is used to plan the simulation, and the mathematical statistics approach is used to analyze the influence degree of mechanical parameters on displacements in the elasto-plastic model. Approach is established to assess the influence degree of these parameters and identify the parameters which can be determined by back-analyzing the displacements in the elasto-plastic model.

关 键 词：岩石力学 弹塑性模型 力学参数 位移反分析 影响度 地下采场 

分 类 号：TD313.1[矿业工程—矿井建设]