富含生物成因气体地层盾构掘进克泥效的密封阻隔效应研究  

RESEARCH ON THE SEALING AND BLOCKING EFFECT OF CLAY SHOCK DURING BIOGENIC GAS-RICH GROUND TUNNELING USING SHIELD TBM

作　　者：李馨芳 张晓平 唐少辉 王浩杰 李方毅 刘浩[3] 李春林 陈鹏 LI Xinfang;ZHANG Xiaoping;TANG Shaohui;WANG Haojie;LI Fangyi;LIU Hao;LI Chunlin;CHEN Peng(The Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province,School of Civil Engineering,Wuhan University,Wuhan 430072,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan 430072,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;Ji nan Urban Construction Group Co.,Ltd.,Ji nan 250031,China;China Railway 14th Bureau Group Shield Engineering Co.,Ltd.,Nanjing 211800,China)

机构地区：[1]武汉大学土木建筑工程学院,岩土与结构工程安全湖北省重点实验室,武汉430072 [2]武汉大学水资源与水电工程科学国家重点实验室,武汉430072 [3]中铁第四勘察设计院集团有限公司,武汉430063 [4]济南城市建设集团有限公司,济南250031 [5]中铁十四局集团大盾构工程有限公司,南京211800

出　　处：《工程地质学报》2022年第5期1721-1730,共10页Journal of Engineering Geology

基　　金：中铁第四勘察设计院集团有限公司科技研究项目(资助号:TSYTSY-JLLCHSD[2020]-04);国网江苏省电力有限公司经济技术研究院科技研究项目(资助号:JSJS1600328);中国博士后科学基金第4批特别资助(站前)项目(资助号:2022TQ0241).

摘　　要：富含生物成因气体地层盾构隧道施工风险高,气体极易通过开挖舱、泥浆管、盾尾间隙和管片节间渗入盾构和隧道内部,引发燃爆事故威胁施工安全。为了密封阻隔生物成因气体的泄漏通道,克泥效被用于填充中盾和洞壁之间的开挖间隙。本研究针对盾构掘进过程中生物成因气体的密封阻隔问题,提出了一种克泥效密封阻隔生物成因气体试验装置与方法,研究了克泥效注入厚度与气体击穿时间的相关关系,揭示了生物成因气体在克泥效中的渗透扩散机制,并依托苏通GIL综合管廊工程验证了克泥效密封阻隔生物成因气体的作用效果。研究结果表明:气体击穿时间随克泥效注入厚度的增加近似线性增长;当克泥效注入厚度为30 mm时,平均击穿时间为51.5 min,超过单环管片拼装所需最长时间50 min,满足苏通GIL综合管廊工程施工需求。现场气体监测结果表明,相较于注入克泥效填充开挖间隙之前,注入克泥效后CH_(4)和CO浓度均在允许范围内,克泥效有效阻隔了生物成因气体进入盾构隧道内部。相关研究结果可为类似工程地质条件下生物成因气体防治提供理论依据和技术支撑。Shield tunnel construction in the biogenic gas-rich ground is a dangerous procedure.Biogenic gas is prone to penetrate shield TBM and shield tunnel through excavation cabin,slurry pipeline,tail clearance and segment clearance.It will induce combustion and explosion accidents and threaten the construction safety of shield tunnels.To seal and block the leakage of biogenic gas,clay shock is utilized to fill the gap between the middle shield and tunnel wall.In this study,aiming at the sealing and blocking problem of biogenic gas in the process of shield tunneling,a test apparatus and test method for analyzing the sealing and blocking effect of clay shock on biogenic gas have been developed.The correlation between clay shock injection thickness and gas breakdown time has been studied.The permeation mechanism of biogenic gas has been revealed.The application effect of clay shock in Sutong GIL Yangtze River Crossing Cable Tunnel has been verified.The results indicate that the gas breakdown time increases linearly with the increase of clay shock thickness.When clay shock thickness is 30 mm,the average breakdown time is 51.5 min,which exceeds the longest time required for single-ring segment assembly by 50 min and meets the requirements of the Sutong GIL Yangtze River Crossing Cable Tunnel.Field gas monitoring results indicate that when the excavation gap is filled with clay shock during shield tunnel construction,the concentration of CH_(4) and CO are within the allowable range and clay shock achieves the sealing and blocking effect compared to the absence of biogenic gas prevention measures.The presented study provides a theoretical basis and technical support for the prevention and control of biogenic gas in similar engineering geological conditions.

关 键 词：盾构隧道 生物成因气 阻隔作用 克泥效厚度 击穿时间 

分 类 号：TU455.43[建筑科学—岩土工程]