基于均匀化方法的破碎千枚岩隧道稳定性分析  

Research on Tunnel Stability Analysis of Broken Phyllite Section of a Tunnel based on Homogenization Method

作　　者：席海龙 张凯 朱滨 胡宏博 吴红刚 周鑫陆 XI Hailong;ZHANG Kai;ZHU Bin;HU Hongbo;WU Honggang;ZHOU Xinlu(Bridge and Tunnel Engineering Company of China Railway No.3 Engineering Group Co.,Ltd.,Chengdu 610083,China;College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730099,China;China Northwest Research Institute Co.,Ltd of CREC,Lanzhou 730099,China;School of Civil Engineering,Lanzhou JiaoTong University,Lanzhou 730070,China)

机构地区：[1]中铁三局集团桥隧工程有限公司,成都610083 [2]兰州大学土木工程与力学学院,兰州730000 [3]中铁西北科学研究院有限公司,兰州730099 [4]兰州交通大学土木工程学院,兰州730070

出　　处：《铁道勘察》2023年第2期38-43,共6页Railway Investigation and Surveying

摘　　要：隧道穿越高地应力破碎千枚岩段时,容易造成围岩压力和能量的释放,导致隧道支护结构产生大变形破坏。当前的隧道围岩稳定性分析多将围岩与支护结构分开研究,分别求解特征曲线,但是锚杆注浆支护的原理是增强围岩的强度,与围岩成为一个整体共同承载地应力,不能单独作为支护结构考虑。以兰州-张掖三四线铁路XQ2标段新乌鞘岭隧道为研究背景,通过均匀化方法对锚杆注浆加固下的隧道围岩进行等效化处理,并基于约束-收敛理论计算出等效围岩特征曲线及支护特征曲线。结果表明,原支护结构强度不能有效地控制围岩变形,将隧道稳定性分析结果与现场监测数据进行对比,发现新方法能够很好地反映工程实际情况,为锚注加固作用下的破碎千枚岩隧道稳定性分析提供一种相对简便的定量计算方法。When the tunnel passes through the high-stress broken phyllite section,it is easy to release the pressure and energy accumulated in the surrounding rock,resulting in large deformation and damage of the tunnel support structure.Current stability analysis of the tunnel surrounding rock focuses on the surrounding rock and support structure,and solves the characteristic curve separately.However,the principle of anchor grouting support is to enhance the strength of the surrounding rock,which becomes a whole with the surrounding rock to carry the ground stress together and cannot be considered as a support structure alone.Taking the Silurian phyllite tunnel in newlt-built Wushaoling tunnel project of the XQ2 bid section of the Lanzhou-Zhangye No.3 and No.4 railway as the research project,the tunnel surrounding rock reinforced by bolt grouting was equivalent by the homogenization method.The equivalent surrounding rock characteristic curve and support characteristic curve were calculated based on the constraint-convergence theory.The results show that,the strength of the original support structure cannot effectively control the deformation of the surrounding rock.Comparing the results of the tunnel stability analysis with the on-site monitoring data,it is found that it can be well in line with the actual situation of the project.The research provides a relatively simple quantitative calculated method for the stability analysis of broken phyllite tunnels under the bolt-grouting support reinforcement.

关 键 词：铁路隧道 千枚岩 均匀化方法 收敛-约束理论 围岩特征曲线 支护特征曲线 

分 类 号：U451[建筑科学—桥梁与隧道工程] U452[交通运输工程—道路与铁道工程]