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分析围岩稳定、确定合适的支护方案需确定真实的围岩参数,但开挖前很难确定围岩的参数和支护的具体方案。为此,利用有限元法模拟爆破产生的松动圈、松弛圈的状态,并结合某实际工程,分析了围岩在施工过程中的位移变化和应力变化,根据实测的收敛变形对弹性模量进行反演。结果表明,数值模拟计算值与现场实测数据拟合度较高,反演出的围岩参数可信,为施工期的安全监测和稳定运行提供了参考依据。
Analysis of the stability of surrounding rock, determine the appropriate support program to determine the true surrounding rock parameters, but it is difficult to determine the parameters of rock and excavation before excavation specific program. Therefore, the finite element method is used to simulate the state of loose ring and slack ring generated by blasting. The displacement and stress of surrounding rock during construction are analyzed with a practical project. According to the measured convergence deformation, the elastic modulus Inversion. The results show that the calculated values of the numerical simulations are highly fitted to the field measured data and the parameters of the surrounding rock that are inverted are credible, which provides a reference for the safety monitoring and stable operation in the construction period.