“巨厚岩层”覆盖下泥水盾构施工沉陷原因及对策研究  

Study on the Reasons and Countermeasure of Ground Subsidence Caused by Slurry Shield Construction Covered by a Giant Thick Rock Formation

作　　者：竺维彬 米晋生 谢文达 孟繁璟 ZHU Weibin;MI Jinsheng;XIE Wenda;MENG Fanjing(Engineering Case Committee of Chinese Society for Rock Mechanics&Engineering,Guangzhou 510000;Guangzhou Mass Transit Engineering Consultant Co.,Ltd.,Guangzhou 510000)

机构地区：[1]中国岩石力学与工程学会工程实例专委会,广州510000 [2]广州轨道交通建设监理有限公司,广州510000

出　　处：《现代隧道技术》2022年第6期1-13,共13页Modern Tunnelling Technology

摘　　要：行业普遍认为泥水盾构施工在地面沉降控制精度方面优于土压盾构,但近10余年,多台泥水盾构(小的开挖直径不到5 m,大的超过15 m)均在“巨厚岩层”地质条件下施工时发生了地面沉陷事件,甚至个别事件造成的经济损失或社会影响极其严重。通过对多个典型案例深入跟踪、剖析和研究,发现产生这类沉陷事件的主要特征:(1)地处复合岩层;(2)掘进过程曾发生“滞排”或“泥饼”现象;(3)频繁洗舱,泥水舱压力波动大。据此从地质、盾构机、施工技术措施和管理等方面全方位推论出“巨厚岩层”覆盖下泥水盾构施工沉陷的原因、机理,并在此基础上,提出相应对策及建议,以供行业人员借鉴。It is generally recognized in the industry that slurry shield construction is superior to earth pressure shield in terms of ground subsidence control accuracy. But in recent ten years, many ground subsidence had happened caused by slurry shield machine construction operating under“giant thick rock”condition, diameter of shield machine was from 5 m to 15 m,even several of them led to huge economy lost and society impression.In view of the above problems, the author of this paper has found the main characteristics of such subsidence events through in-depth tracking, analyzing and researching of typical cases.(1) Shield machine was in fracture developed strata or mixed face ground with weathering slot or surface borehole locations;(2) Shield machine had appeared“clogging”or“claycake”before ground subsidence occurred;(3) Flush excavation chamber frequently was used in order to eliminate“clogging”as soon as possible and dredge slurry circulation lines, the result led to support pressure unstable. Based on this, the reasons and mechanism of ground subsidence caused by slurry shield construction under“giant thick rock”are deduced from geology, shield machine, construction technical measures and management, etc.Author answered the query comprehensively and on that basis, points out countermeasure suggestion for the reference of industry personnel.

关 键 词：“巨厚岩层” 泥水盾构 泥饼 滞排 压力波动 地面沉陷 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]