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隧道建设(中英文) ›› 2016, Vol. 36 ›› Issue (5): 549-555.DOI: 10.3973/j.issn.1672-741X.2016.05.009

• 研究与探索 • 上一篇    下一篇

膨胀土地层泥水盾构停机时开挖面破坏原因及防治措施研究——以扬州瘦西湖隧道工程为例

张亚洲1,2, 朱伟1,2, 陈健3, 闵凡路1,2, 史海岭4   

  1. (1. 河海大学岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098; 2. 河海大学土木与交通学院, 江苏 南京 210098; 3. 中铁十四局集团有限公司, 山东 济南 250014;  4. 南通职业大学建筑工程学院, 江苏 南通 226007)
  • 收稿日期:2015-08-03 修回日期:2015-09-06 出版日期:2016-05-20 发布日期:2016-05-25
  • 作者简介:张亚洲(1991—),男,湖南岳阳人,河海大学岩土工程专业在读硕士,研究方向为盾构隧道设计与施工。Email: yazhouzhang321@163.com。
  • 基金资助:

    国家重点基础研究发展计划(973计划)(2015CB057803); 江苏省疏浚与泥处理利用国家工程技术研究中心培育点(BM2013013); 中央高校基本科研业务费专项资金资助(2016B01214)

Study of Causes and Countermeasure of Excavation Face  Failure of Slurry Shield Tunnel Stopping Section in Expansive Soil:  A Case Study of Slender West Lake Tunnel in Yangzhou

ZHANG Yazhou1,2, ZHU Wei1, 2, CHEN Jian3, MIN Fanlu1,2, SHI Hailing4   

  1. (1. Key Laboratory of Geomechanics and Embankment Engineering (Hohai University), Ministry of  Education, Nanjing 210098, Jiangsu, China; 2. College of Civil and Transportation Engineering,  Hohai University, Nanjing 210098, Jiangsu, China; 3. China Railway 14th Bureau Co., Ltd.,  Jinan 250014, Shandong, China; 4. Architectural Engineering Institute, Nantong Vocational  University, Nantong 226007, Jiangsu, China)
  • Received:2015-08-03 Revised:2015-09-06 Online:2016-05-20 Published:2016-05-25

摘要:

为解决扬州瘦西湖隧道泥水盾构在膨胀性黏土地层停机时开挖面失稳和地面塌陷的问题,采用膨胀试验和崩解试验,研究下蜀黏土的膨胀特性和崩解特性。利用现场实测资料和数值模拟结果分析和论证膨胀性黏土地层停机时地表塌陷的原因: 泥浆持续渗透引起开挖面前方土体膨胀、崩解和剥落是导致开挖面失稳的原因; 开挖面的失稳过程可以分为4个阶段,分别是泥浆渗透阶段、开挖面前方土体膨胀崩解阶段和开挖面上方土体塌落阶段、塌落发展到地表形成地表塌陷阶段。提出控制盾构掘进参数、多次短停、适当提高泥水支护压力和适当增加泥浆密度、黏度等防止泥水盾构在膨胀性黏土地层停机时开挖面破坏的措施,并指导现场施工,取得较好的应用效果。

关键词: 扬州瘦西湖隧道, 泥水盾构, 膨胀性黏土, 盾构停机, 开挖面失稳

Abstract:

Excavation face failure and ground surface subsidence occurred at shield stopping section in expansive soil during the construction of Slender West Lake Tunnel. As a result, the expansion test and disintegration test are carried out. The main cause of the excavation face failure and ground surface subsidence, continuous permeation of slurry, is analyzed by site monitoring data and numerical simulation results. The excavation face failure can be divided into 4 phases, i. e. slurry permeating, soil expanding and disintegrating in front of excavation face, soil collapse above excavation face and ground surface subsidence. A series of countermeasures, such as shield boring parameter control, shield stop frequently and transiently, slurry support pressure increasing and slurry improving, are proposed and used. The good effect is achieved.

Key words: Slender West Lake Tunnel in Yangzhou, slurry shield, expansive clay, shield stop, excavation face failure

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