基于正交设计的岩体力学参数灵敏性分析

针对岩土工程弹塑性位移反分析参数多、难度大的问题，就如何有效、合理地确定岩体的力学参数，进行工程设计和反演分析至关重要。灵敏系数在理论上虽然可用于判断位移对参数的灵敏性，但在实际工程中，结构状态函数很难用显式表示。故针对这一问题，结合地下洞室开挖的实际工况，采用FLAC”软件分析拱形洞室开挖过程中产生的拱顶竖向位移和拱角水平位移，应用正交表和方差分析的方法，分别进行模拟试验方案的确定和计算结果分析，实现位移对岩体力学参数灵敏性的分析研究，从而确定了关键反演参数。

Based on the orthogonal design of rock mass mechanics parameters sensitivity analysis

In view of the problem that many analysis parameters and high difficulty in the geotechnical engineering elastic -plastic displacement back analysis, how to effectively and reasonably determine the mechanical parameters of rock mass, engineering design and inverse analysis is very important. Though sensitive co- efficient can be used to judge the sensitivity of displacement for parameters in theory, the structure state function is difficult to use explicit said the actual engineering. Therefore, in order to solve this problem, combining with underground cavern excavation of the actual working condition, the software FLAC2D is used to analyze the vertical displacement and arch Angle horizontal displacement in arched hole chamber excavation process. Through the application of orthogonal table and variance analysis method, the simu- late experiment is determined and the computation results are analyzed respectively. The analysis and re- search of the sensitivity of displacement for rock mechanics parameter is performed, so as to determine the key parameters inversion.