紧邻盾构隧道超深基坑注浆止水帷幕的设计与施工参数研究
庞小朝
Study on Design and Construction Parameters of Grouting Waterproof Curtain for Ultra-deep Foundation Pit Adjacent to Shield Tunnel
PANG Xiaochao
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作者信息:铁科院(深圳)研究设计院有限公司， 518041， 深圳
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Affiliation:China Academy of Railway Sciences Shenzhen Research and Design Institute, 518041, Shenzhen, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.07.040
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中图分类号/CLCN:TU472.5
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栏目/Col:施工技术
摘要:
周边工程活动导致地下水位下降是引起地铁盾构隧道变形超标和破坏的主因之一，止水措施对紧邻地铁隧道超深基坑项目施工极为关键。梳理了深圳恒大中心超深基坑项目花岗岩破碎带注浆帷幕工程原位测试、帷幕注浆施工资料，通过对原位数据分析，研究了破碎花岗岩地层透水率注浆量的统计关系，探讨了注浆止水帷幕透水率设计值、注浆量等关键指标。研究表明：破碎花岗岩地层注浆量随岩层透水率增大而线性增加；采取适当的注浆工艺，破碎花岗岩地层注浆帷幕透水率可控制在1.0 Lu以下，实测12.4%的注浆段注浆量大于500 kg/m，中风化岩面以下0~20 m范围内，10%超越概率的注浆量控制值可取1 381 kg/m。
Abstracts:
The descending of underground water level caused by surrounding engineering activities is one of the main reasons for the deformation and damage of metro shield tunnel, and waterproof measures are key to ultradeep foundation pit project adjacent to shield tunnel. In-situ test, curtain design and construction of grouting curtain in fractured granite layer of Shenzhen Evergrande center project are systematically sorted. Through analysis of original position data, the statistical relation between fractured granite stratum permeability and grouting volume is studied, and key values including the grouting waterproof curtain permeability design value and grouting volume are discussed. Research result shows that: the grouting volume of fractured granite layer increases with permeability. With appropriate grouting technology, the permeability of grouting curtain of broken granite layer can be controlled below 1.0 Lu. As a result, the grouting volume of 12.4% grouting section measured is more than 500 kg/m, and the grouting volume of 10% exceeding probability within 0 ~ 20 m below moderately weathered rock surface is 1381 kg/m.
引文 / Ref:
庞小朝.紧邻盾构隧道超深基坑注浆止水帷幕的设计与施工参数研究[J].城市轨道交通研究，2022，25（7）：197.
PANG Xiaochao.Study on Design and Construction Parameters of Grouting Waterproof Curtain for Ultra-deep Foundation Pit Adjacent to Shield Tunnel[J].Urban mass transit，2022，25（7）：197.
PANG Xiaochao.Study on Design and Construction Parameters of Grouting Waterproof Curtain for Ultra-deep Foundation Pit Adjacent to Shield Tunnel[J].Urban mass transit，2022，25（7）：197.
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