高压富水深竖井工作面预注浆关键技术参数研究及应用  

Study and Application of Key Technical Parameters of Pre-grouting in High-pressure Water-rich Deep Shaft Face

作　　者：张民庆 辛维克 贾大鹏 司景钊 王唤龙[3] ZHANG Minqing;XIN Weike;JIA Dapeng;SI Jingzhao;WANG Huanlong(Engineering Management Center of China State Railway Group Co.,Ltd.,Beijing 100844;China Railway Tunnel Group Co.,Ltd.,Guangzhou 511457;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031)

机构地区：[1]中国国家铁路集团有限公司工程管理中心,北京100844 [2]中铁隧道局集团有限公司,广州511457 [3]中铁二院工程集团有限责任公司,成都610031

出　　处：《现代隧道技术》2022年第6期177-186,共10页Modern Tunnelling Technology

基　　金：中国国家铁路集团有限公司科技研究开发计划课题(P2019G055).

摘　　要：高黎贡山隧道竖井施工中,超前地质探孔单孔最大涌水量为126.9 m^(3)/h,对工作面采用预注浆技术进行注浆加固和堵水处理,其中主井工作面预注浆实施12个循环,副井工作面预注浆实施11个循环。应用结果表明:(1)采用工作面预注浆法可以有效解决高压富水深竖井注浆加固及堵水技术难题,能够保证竖井安全正常施工;(2)采用10 m^(3)/h作为竖井正常施工涌水量控制基准值是合适的,当工作面涌水量≥10 m^(3)/h时应采取注浆堵水措施;(3)竖井开挖前超前探孔单孔涌水量宜采用1.4 L/(min·m)作为控制基准值。当超前探孔循环长度为60 m时,基准值为5.0 m^(3)/h;(4)竖井工作面预注浆施工,检查孔涌水量宜采用1.0 L/(min·m)作为控制基准值。当注浆循环长度为60 m时,基准值为3.6 m^(3)/h;(5)综合检查孔涌水量、注浆堵水率、竖井开挖时涌水量,以及综合成井效率等因素,竖井工作面预注浆时宜采用60 m作为一个循环注浆段落长度。In the shaft construction of the Gaoligongshan Tunnel, the maximum water inrush of a single advanced geologic exploration borehole is 126.9 m^(3)/h, and the pre-grouting technology is used on the faces for grouting reinforcement and water blocking. A total of 12 pre-grouting cycles were conducted for the main shaft face and 11 pregrouting cycles were conducted for the auxiliary shaft face. The results of application show that(1) the face pregrouting method is employed to effectively solve the difficulties in grouting reinforcement and water blocking technologies for high-pressure water-rich deep shafts and ensure safe and normal construction of shafts;(2) it is appropriate to use 10 m^(3)/h as the reference value of water inrush control during the normal construction of shafts. When the face water inrush is equal to or greater than 10 m^(3)/h, grouting and water blocking measures shall be taken;(3) before the excavation of shafts, it is better to use 1.4 L/(min·m) as the reference value of water inrush control of a single advanced exploration borehole. When the length of an advanced exploration borehole cycle is 60 m, the reference value is 5.0 m^(3)/h;(4) for the pre-grouting in the shaft face, it is better to use 1.0 L/(min·m) as the reference value of water inrush control of an inspection hole. When the length of a grouting cycle is 60 m, the reference value is 3.6 m^(3)/h;(5) based on the water inrush of an inspection hole, grouting and water blocking rate, water inrush of a shaft during excavation, and efficiency of well completion, 60 m should be used as the length of a cyclic grouting section when pre-grouting is conducted in the shaft face.

关 键 词：铁路隧道 深竖井 高压富水 工作面预注浆 关键技术参数 

分 类 号：U455.8[建筑科学—桥梁与隧道工程]