大跨地铁隧道组合工法穿越断层时的围岩变形控制分析  

Analysis of Surrounding Rock Deformation Control of Large-span Metro Tunnel Crossing Fault by Combined Tunneling Method

作　　者：唐晓杰 石磊 陈佳玮 彭振 李元海 TANG Xiaojie;SHI Lei;CHEN Jiawei;PENG Zhen;LI Yuanhai(School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;China Communications Construction Company (Guangzhou) Ltd., Guangzhou 511458, Guangdong, China)

机构地区：[1]中国矿业大学力学与土木工程学院,江苏徐州221116 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [3]中交(广州)建设有限公司,广东广州511458

出　　处：《隧道建设（中英文）》2019年第2期227-239,共13页Tunnel Construction

基　　金：国家重点基础研究发展计划973项目(2014CB046905)

摘　　要：以深圳轨道交通2号线新莲区间隧道为工程背景,针对大跨地铁隧道穿越断层的围岩变形与控制问题,采用FLAC3D数值模拟,分析双侧壁导坑工法与CD工法不同组合穿越断层的围岩变形规律与注浆控制效果。结果表明:1)隧道穿越断层破碎带时,Ⅳ、Ⅴ级围岩交界并与断层相交的拱顶处以及Ⅴ级围岩与断层相交的拱腰处的围岩位移最大,是变形控制的关键部位; 2)双侧壁导坑法穿越断层对大跨地铁隧道的围岩变形控制较好,工程实际工法组合下围岩变形的最大影响范围为12.4 m,围岩位移控制较好,工法组合合理有效; 3)注浆加固对断层破碎带处围岩变形模式的影响与控制作用明显,注浆后围岩变形区域由未注浆的"枣核形"变为较均匀的"椭圆形"; 4)提出位移控制率均值的概念,以定量描述围岩的注浆效果,隧道穿越断层时3 m厚度注浆的围岩位移控制率均值达51%,围岩变形控制效果较优。The surrounding rock deformation laws and grouting control effect of large-span Xinxiu-Liantang Port Tunnel on Shenzhen Rail Transit Line No. 2 are analyzed by FLAC3D numerical simulation method when adopting different combinations of double-side drift method and CD method crossing fault. The analytical results show that:(1) The maximum displacement occurs at two key deformation control areas, i.e. the intersection of crown top between grade Ⅳ/Ⅴ surrounding rock boundary and the fault zone and the intersection of waist between grade Ⅴ surrounding rock and the fault zone, when tunnel crosses fault and fracture zone.(2) The deformation of surrounding rock is under effective control by adopting double-side drift method when large-span metro tunnel crosses fault zone;and the maximum influencing scope of surrounding rock under actual construction method combination is 12.4 m.(3) The grouting around the fault and fracture zone has a good effect on surrounding rock deformation mode and control;and the shape of surrounding rock deformation area turned from a date pit to an uniform oval.(4) A quantitative description of the grouting control effect is proposed in surrounding rock displacement. The vertical displacement control rate of surrounding rock with 3 m grouting thickness reaches 51%, which shows a good surrounding rock deformation control effect.

关 键 词：大跨地铁隧道 断层 FLAC3D 工法组合 注浆 围岩变形 监测 

分 类 号：U45[建筑科学—桥梁与隧道工程]