隧道数值模拟计算边界范围研究

Surrounding Rock Boundary Range Study on Tunnel Numerical Simulation

本文以某高速公路隧道的开挖和支护过程为工程实例,采用有限差分法岩土分析软件Adina进行全过程模拟,旨在分析模型的边界效应对相应求解精度的影响。研究方法是在其它条件同等的情况下,采用不同的模型边界范围建模,并分别独立进行模拟求解,通过比较不同模型下同一截面的力学响应的差异,进而分析模型边界范围这一单因素对隧洞开挖数值模拟的精度影响。研究思路和结论可以为类似的数值模拟关于如何合理地选择模型边界范围提供参考,从而使模拟实现过程的时效性和精度达到较佳的统一。

Based on the excavation and support construction of a tunnel case in the freeway,the boundary selection during the numerical simulation of deformation safety in soft argillaceous shale tunnel is studied.The Adina is used to simulate the full construction process,in order to analyze the influence of boundary effect to the solution precision in modeling.Under the same condition of other factors,different model boundary areas are simulated independently.The influence of boundary areas to the precision of tunnel excavation modeling can be analyzed by comparing the mechanical responses of different models in the same section.The research methods and conclusions can be a reference for similar numerical models of how to select reasonable model boundary area,therefore the timeliness and precision can achieve a better integration in simulating process in further researches.