基于围岩动态分级的隧道底部支护优化与稳定性研究  

Support optimization and stability of tunnel bottom based on dynamic classification of surrounding rock

作　　者：徐东强 邢亮 曹富兴 XU Dongqiang;XING Liang;CAO Fuxing(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401

出　　处：《河北工业大学学报》2021年第3期68-74,共7页Journal of Hebei University of Technology

基　　金：河北省交通运输厅2013年度科研项目(201302025);河北省交通运输厅项目(Y-2012048)。

摘　　要：在对以往隧道工程进行调研的基础上,确定合适的围岩动态分级方法后,采用围岩分级后的岩石力学参数在承赤高速进行现场试验与监测得出平底隧道支护符合稳定要求。并根据霍克布朗准则,通过FLAC3D有限差分软件对比不同隧道底部模型的拱顶沉降、拱底隆起和二衬应力得出:Ⅳ1级围岩下隧道两个模型的竖向位移变形值相差不超1 mm,平底隧道的二衬与仰拱隧道二衬在承载应力上差距较小。故Ⅳ1级围岩下取消仰拱,采用平底隧道的形式具有可行性。其他类似工程可借鉴于此研究成果。On the basis of previous tunnel projects'investigation,suitable dynamic classification method of surrounding rock is determined.The field test and monitoring of rock mechanics parameters after surrounding rock classification at Chengchi Expressway show that the flat bottom tunnel supports meets the stability requirements.According to the rule of Hoek-Brown,through FLAC3D finite difference software contrast different model at the bottom of the tunnel vault subsid⁃ence,arch bottom uplift and the secondary lining,can conclude that the vertical displacement of each tunnel model dif⁃fers by no more than 1 mm in controlling settlement for IV1 surrounding rock and there was a small difference in bearing stress between the secondary lining of flat bottom tunnel and that of invert tunnel.It verifies the feasibility of using flat-bottom tunnel to substitute invert arch for IV1 surrounding rock.Other similar projects can draw on the results of this re⁃search.

关 键 词：围岩动态分级 岩石力学参数 霍克布朗准则 有限差分软件 可行性 

分 类 号：U451[建筑科学—桥梁与隧道工程]