基于FLAC3D的隧道施工数值模拟及现场监测分析

Numerical simulation and field monitoring analysis for tunnel construction based on FLAC3D

21世纪以来,随着我国对交通事业的大力发展,隧道工程在我国交通建设中占着较大的部分,然而隧道工程技术还不够成熟,围岩的稳定性和相关支护方式的设计都需要更加深入的研究。本文以云贵高原某隧道工程的左线某段为研究背景,模拟隧道段实际地质情况,运用FLAC3D对隧道循环开挖后的位移变化、塑性区体积变化、应力分布及大小、初期支护的受力等情况进行分析,将模拟数据与实际监测数据对比分析验证模型合理性。模拟结果表明:该段隧道开挖后,围岩较为稳定,无明显塑性区破坏和大变形情况发生,与实际情况相符;模拟的位移值与实际监测值较为符合,但仍然存在一定的误差,可以在一定程度上为施工提供参考建议。

Since the 21 st century,with the vigorous development of China’s transportation industry,tunnel engineering occupies a large part of transportation construction in China.However,the tunnel engineering technology is not mature enough,and the stability of the surrounding rock and the design of related support methods require more in-depth research.In this paper,a section of the left line of a tunnel project on the Yunnan-Guizhou plateau is used as the research background to simulate the actual geological conditions of the tunnel section,and FLAC3 D is used to analyze the displacement changes,volume changes in the plastic zone,stress distribution and magnitude,and the force of the initial support after cyclic excavation of the tunnel.The simulated data are analyzed and compared with the actual monitoring data to verify the reasonableness of the model.The simulation results show that after the excavation of the tunnel,the surrounding rock is relatively stable without obvious plastic zone damage and large deformation,which is consistent with the actual situation;the simulated displacement value is more consistent with the actual monitoring value,but there is still a certain error,which can provide a certain degree of reference for construction suggestions.