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高地应力软岩隧道围岩变形时间效应明显,基于现场变形监测结果,通过反演分析得到围岩蠕变参数,可以为隧道长期变形预测和支护结构设计提供科学指导。以有限元软件ABAQUS为平台,建立基于结合罚函数和Nelder-Mead算法的围岩蠕变参数反演程序,通过对宜巴高速峡口隧道变形监测数据的反演分析,验证了程序的正确性和合理性,并得到了围岩的蠕变损伤参数和蠕变损伤区范围,为峡口隧道的设计和施工提供科学指导。
The deformation time of surrounding rock in high stress soft rock tunnel is obvious. Based on the field deformation monitoring results, the creep parameters of surrounding rock can be obtained by inversion analysis, which can provide scientific guidance for the long-term deformation prediction of the tunnel and the design of the support structure. Based on the finite element software ABAQUS, a creep parameter inversion program based on the combination of penalty function and Nelder-Mead algorithm is established. The correctness of the program is verified by back analysis of deformation monitoring data of Xiakoukou tunnel at Yiba high- And the rationality of creep zone, the creep damage parameters and creep damage zone of surrounding rock are obtained, which provide scientific guidance for the design and construction of Xiakou tunnel.