盾构隧道穿越高强度强富水灰岩上浮段工程风险分析及应对措施
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摘要
针对盾构穿越土岩交界面、高强度富水灰岩段及灰岩岩溶区所存在的风险进行分析,合理做好盾构选型,通过工程类比法并结合工程实际提出相应处理措施。采取全土压掘进模式、合理的掘进参数及渣土改良等手段控制土岩交界面上方管线及地表变形;穿越高强度强富水灰岩段,为防止掘进过程中产生"喷涌"现象,采取盾构半敞开式掘进模式、洞内补偿注浆封堵后方来水、地表注射聚氨酯和渣土改良等措施;针对高强度硬岩,通过合理选用刀具、控制盾构掘进参数减少刀具的磨损和破坏。穿越石灰岩岩溶区,针对溶洞的大小、与隧道相对位置关系和充填类型采取地面袖阀管注浆预处理,并结合管片预留孔进行注浆处理,通过采取上述综合技术措施,保证了盾构机在高强度富水灰岩上浮段的顺利掘进。
According to the analysis of the shield tunnel crossing through earth rock interface,high strength water rich limestone section and limestone karst area,the selection of shield type is well implemented, and corresponding treatmentmeasures are put forward through engineering analogy and engineering practice. To control the deformation of pipelines and ground surface above the earth rock interface,full earth pressure tunneling mode,reasonable tunneling parameters and soil improvement are adopted. In order to prevent the excavation from "gushing "through high strength and strong water rich limestone section,semi open tunneling mode of shield, compensating grouting in hole, surface injection of polyurethane and improvement of residual soil are employed. In the case of high strength hard rock,tool wear and damage can be reduced by selecting appropriate cutters and controlling tunneling parameters. According to the size of the karst cave,relative position relationship and filling type of the karst cave,ground sleeve valve tube grouting and hole grouting are conducted. The above comprehensive technical measures are adopted to ensure smooth tunneling of the shield machine in the upper floating section of high strength water rich limestone.
According to the analysis of the shield tunnel crossing through earth rock interface,high strength water rich limestone section and limestone karst area,the selection of shield type is well implemented, and corresponding treatmentmeasures are put forward through engineering analogy and engineering practice. To control the deformation of pipelines and ground surface above the earth rock interface,full earth pressure tunneling mode,reasonable tunneling parameters and soil improvement are adopted. In order to prevent the excavation from "gushing "through high strength and strong water rich limestone section,semi open tunneling mode of shield, compensating grouting in hole, surface injection of polyurethane and improvement of residual soil are employed. In the case of high strength hard rock,tool wear and damage can be reduced by selecting appropriate cutters and controlling tunneling parameters. According to the size of the karst cave,relative position relationship and filling type of the karst cave,ground sleeve valve tube grouting and hole grouting are conducted. The above comprehensive technical measures are adopted to ensure smooth tunneling of the shield machine in the upper floating section of high strength water rich limestone.
引文
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[2]邓彬,顾小芳.上软下硬地层盾构施工技术研究[J].现代隧道技术,2012,49(2):59-63.
[3]冯立君.盾构穿越上软下硬地层施工技术措施[J].现代城市轨道交通,2016(2):71-73.
[4]李光耀.狮子洋隧道泥水盾构穿越上软下硬地层施工技术[J].铁道标准设计,2010(11):89-94.
[5]李俊伟,李丽琴,吕培印.复合地层条件下盾构选型的风险分析[J].地下空间与工程学报,2007(S1):1241-1244.
[6]朱宏海.上软下硬复合地层地铁盾构隧道设计及施工探析[J].隧道建设,2015,35(2):144-148.
[7]李茂文,刘建国,韩雪峰,等.长距离硬岩地层盾构施工关键技术研究[J].隧道建设,2009,29(4):470-474.
[8]尤显明,杨书江.短距离硬岩及上软下硬地层盾构法施工技术[J].城市轨道交通研究,2007(5):32-34.
[9]杨书江.盾构在硬岩及软硬不均地层施工技术研究[D].上海:上海交通大学,2006.
[10]钱庄,许烨霜,沈水龙,等.砂土覆盖型岩溶地层盾构隧道施工地面注浆加固实例分析J].隧道建设,2016,36(4):479-484.
[11]桂林.广州轨道交通五号线盾构施工关键技术[J].铁道工程学报,2007(11):76-82.
[12]张合青,杨国荣,魏弋锋.广州新白云机场土洞、溶洞的稳定性判别及其加固处理[J].地球与环境,2005(3):36-40.
[13]杨育僧,吴昊,许建飞,等.岩溶地层中的盾构隧道施工[J].铁道工程学报,2007(7):56-60.
[14]黎新亮.盾构隧道穿越湘江溶洞区工程风险分析及应对措施探讨[J].铁道标准设计,2014,58(2):64-69.
[15]马福东.盾构隧道穿越江底溶洞发育区若干关键技术探析[J].铁道标准设计,2018,62(1):93-98.