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隧道建设(中英文) ›› 2015, Vol. 35 ›› Issue (9): 945-948.DOI: 10.3973/j.issn.1672-741X.2015.09.014

• 施工技术 • 上一篇    下一篇

旋喷桩技术在郑州地铁盾构脱困中的新应用

刘凯1, 王玉祥1, 陈霞2   

  1. (1. 中铁隧道股份有限公司, 河南郑州 450001; 2. 聊城大学建筑工程学院, 山东聊城 252000)
  • 收稿日期:2015-06-20 修回日期:2015-08-10 出版日期:2015-09-20 发布日期:2015-09-22
  • 作者简介:刘凯(1983—),男,河南新郑人,2009年毕业于西北工业大学,土木工程专业,本科,工程师,现从事现场技术管理工作。

Application of Jet Grouting in Rescue of Jammed Shield: a Case in Construction of Line 2 of Zhengzhou Metro

LIU Kai1, WANG Yuxiang1, CHEN Xia2   

  1.  (1. China Railway Tunnel Stock Co., Ltd., Zhengzhou 450001, Henan, China; 2. Liaocheng University, Liaocheng 252000, Shandong, China)
  • Received:2015-06-20 Revised:2015-08-10 Online:2015-09-20 Published:2015-09-22

摘要:

以郑州地铁2号线北环路站—东风路站区间盾构隧道工程为实例,将旋喷桩浆液调整为惰性膨润土浆液,利用旋喷桩高压浆液、高压风切削及填充土体作用,在工程中进行实施印证,成功解决在富水粉细砂层中盾构刀盘卡刀问题。研究表明: 1)将旋喷桩浆液改为惰性膨润土浆液,一方面可以有效切削束缚附着在盾构刀盘上及周边的砂土;另一方面可以对刀盘周边砂层进行填充改良、增加孔隙率、疏松砂层,减小地层对盾构的束缚力。2)膨润土旋喷桩技术,是一种地面非开挖技术,可有效降低采用洞内开舱及地面开槽(挖竖井)等脱困方式的安全风险,具有较高的功效及安全性。3)该技术较适用于软土地层(特别是砂层),根据其原理,不仅可以解决卡刀盘问题,还可以解决盾构盾壳抱死等问题。

关键词: 郑州地铁, 旋喷桩, 盾构, 脱困, 富水粉细砂层

Abstract:

During the boring of the running tunnel from Beihuanlu station to Dongfenglu station on Line 2 of Zhengzhou Metro, the cutterhead of the shield is jammed in waterrich fine silty sand strata. Jet grouting with inertia bentonite slurry is carried out to rescue the jammed shield. In the end, the jammed cutterhead is rescued successfully. Conclusions drawn are as follows: 1) On the one hand, the inertia bentonite slurry can cut off the sandy soils on the cutterhead; on the other hand, it can fill and condition the sandy strata around the cutterhead, and in turn can reduce the ground stress on the cutterhead; 2) Due to the application of the jet grouting technology, the rescue of the jammed cutterhead is more efficient and more safe; 3) The mentioned technology is applicable to soft soil strata; 4) The mentioned technology can not only rescue the jammed cutterhead, but also can rescue the jammed shield shell. 

Key words: Zhengzhou Metro, jet grouting, shield, jamming, rescue, waterrich fine silty sand strata

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