极软弱围岩巷道反演参数敏感性分析

Sensitivity Analysis of Inversion Parameter for Extremely Soft Rock Roadway

人们在位移反分析的过程中试图通过复杂的模型选取以逼近巷道的真实力学模型,但是复杂模型就意味着需要反演较多的参数,并且要建立较严格的反演理论与方法,然而在实践应用中遇到了较多的困难。通过参数敏感性分析以确定待反演参数是目前在反演过程中通常的做法。本研究利用正交数值模拟试验法对各煤岩体弹塑性力学参数及侧压力系数进行了敏感性分析,揭示了各参数对巷道不同部位位移的影响度,并通过相应的影响度评价方法,确定了待反演参数。

In displacement back analysis process,people try selecting complex models to approach the real mechanical model of roadway,but the complex models needs more inversion parameters,and needs to establish more stringent inversion theory and methods. However,there exist more difficulties in practical application. The parameter sensitivity analysis to determine parameters to be inverted was common practice in the inversion process. The sensitivity analysis on elastic-plastic mechanical parameters and side pressure coefficient of rock mass in each coal layer was conducted by using orthogonal numerical simulation test,showing the impact degree of each parameter on the displacement of different parts of roadway. Furthermore,the evaluation on the corresponding impact degree is adopted to determine the parameters to be inverted.