高压富水区山岭隧道施工注浆堵水技术研究  

Study on Technology of Grouting Water Plugging for Mountain Tunnel Construction in High Pressure and Water Rich Region

作　　者：申玉生[1] 廖雄 陈爱国 黄永鹏 张静[1] SHEN Yu -sh eng;LIAO Xiong;CHEN Ai-guo;HUANG Yong-peng;ZHANG Jing(Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu Sichuan 610031 , China;Sichuan Road & Bridge (G roup) Co., Ltd., Chengdu Sichuan 610200, China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [2]四川公路桥梁建设集团有限公司,四川成都610200

出　　处：《公路交通科技》2019年第6期65-72,共8页Journal of Highway and Transportation Research and Development

基　　金：“十三五”国家重点研发计划项目(2016YFB1200401);国家自然科学基金项目(51678501;51778540)

摘　　要：为了保障高压富水区山岭隧道施工安全,现场经常采用注浆堵水措施,而目前隧道注浆堵水时地下水渗水量和支护结构外水压力变化特性尚有待于进一步研究。依托南大梁高速公路华蓥山隧道工程,基于复合式衬砌山岭隧道"堵水限排"的防排水理念,采用理论分析和数值模拟方法,分析了高压富水区复合式衬砌山岭隧道围岩注浆堵水时地下水渗流场特征,推导了高压富水区山岭隧道采取注浆堵水时隧道渗水量和支护结构外水压力的计算公式,得到了隧道渗水量及支护结构外水压力与注浆圈厚度、围岩和注浆圈渗透系数之比及围岩和初期支护渗透系数之比间的关系。研究结果表明:高压富水区山岭隧道注浆堵水时,隧道渗水量和支护结构外水压力的主要控制因素为:注浆圈厚度、注浆圈及初期支护的渗透系数;隧道渗水量和支护结构外水压力随着注浆圈厚度的增加及其渗透系数的减小而降低,综合考虑注浆堵水效果及施工成本,建议注浆圈厚度为6~8 m、围岩与注浆圈渗透系数之比为100~200时较优;高压富水区山岭隧道防排水系统设计,需要考虑注浆圈和初期支护堵水作用以及横纵向排水管排水效果,即综合防排水设计才可以减小排水量,有效降低支护结构外水压力。研究所得隧道注浆堵水的相关参数成功应用于实际工程,为高压富水区隧道工程注浆堵水设计与施工提供了一定的参考。The grouting is adopted for the mountain tunnel in highpressure and water-rich region as a countermeasure to guarantee smoothconstruction. The variation characteristics of groundwater seepagequantity and external water pressure on the support structure in thegrouting process still needs further study. Based on the Huayingshantunnel engineering project of Nanchong-Dazhu-Liangping expressway andunder the guidance of the water control & drainage concept of "plugginggroundwater and limiting drainage" for composite lining,by using boththeoretical analysis method and numerical simulation method,the seepagefield characteristics of surrounding rock of tunnel with compositelining in high water pressure and water rich region in the groutingprocess is analysed,and a formulas for calculating the groundwaterseepage quantity and external water pressure of the tunnel supportstructure in high pressure and water rich region when grouting arederived. The relationships of the ratios of seepage quantity andexternal water pressure to thickness of grouting ring,permeabilitycoefficient of surrounding rock and grouting ring,and the ratio ofpermeability coefficient of surrounding rock to permeability coefficientof primary support are calculated. The result reveals that(1) In thegrouting process of the tunnel at high pressure and water richregion,the external water pressure and the groundwater seepage quantitymainly decided by the thickness of grouting ring and the permeabilitycoefficients of grouting ring and primary support.(2) The groundwaterseepage quantity and external water pressure decreasing with theincrease of the thickness of grouting ring and the decrease of itspermeability coefficient. With the comprehensive consideration of waterplugging effect and construction cost,the suggested optimum thickness ofthe grouting ring is 6-8 m,and the optimum ratio of permeabilitycoefficients of surrounding rock to grouting ring is 100-200.(3) Thewater-proof and drainage system design for the mountain tunnel needs toconsider the water plugging

关 键 词：隧道工程 注浆堵水 注浆参数 高压富水区 外水压力 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]