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隧道建设(中英文) ›› 2023, Vol. 43 ›› Issue (12): 2133-2138.DOI: 10.3973/j.issn.2096-4498.2023.12.015

• 施工技术 • 上一篇    下一篇

超大直径盾构盾壳被砂浆固结包裹原因分析及处理措施

徐明远1, 邹小春1, 张晓1, 杨伟鸿2   

  1. (1. 中交隧道工程局有限公司, 北京 100102 2. 深圳大学, 广东 深圳 518060)
  • 出版日期:2023-12-20 发布日期:2024-01-04
  • 作者简介:徐明远(1996—),男,黑龙江佳木斯人,2022年毕业于吉林建筑大学,建筑与土木工程专业,硕士,助理工程师,现从事盾构技术管理与研究工作。Email: 1803484114@qq.com。

Cause Analysis and Countermeasures for SuperLargeDiameter Shield Shell Consolidated and Wrapped by Mortar

XU Mingyuan1, ZOU Xiaochun1, ZHANG Xiao1, YANG Weihong2   

  1. (1. CCCC Tunnel Engineering Co., Ltd., Beijing 100102, China; 2. Shenzhen University, Shenzhen 518060, Guangdong, China)

  • Online:2023-12-20 Published:2024-01-04

摘要: 为解决超大直径盾构被砂浆固结包裹引起的地面隆起、管片上浮、管片错台等问题,对可能导致砂浆固结包裹的原因如停机时间过长、注浆量过大、水泥质量浓度过高和处于液化砂层等进行分析,并针对固结原因提出采用打桩机夹住拉森钢板桩振动盾体、疏松盾体外的砂浆结块及土体的方法清除盾体外包裹的固结砂浆。研究结果表明: 1)砂浆包裹与地层土渗透系数大、同步注浆水泥质量浓度过高有一定的关系; 2)盾构经常性停机会促使砂浆固结包裹; 3)通过振动钢板桩的方式可以有效去除盾壳外包裹的砂浆,并可通过调整同步注浆施工工艺以避免再次出现此情况。

关键词: 超大直径盾构, 砂浆固结包裹, 钢板桩

Abstract: Critical issues in shield tunneling, such as prolonged shield shutdowns, excessive grouting volume, high cement content, and the challenges posed by liquefied sandy layers, contribute to the consolidation and wrapping of the shield shell by the mortar, leading to ground uplift, segment floating, and dislocation. A novel mortar removal technology that uses a pile driver to clamp a Larsen steel sheet is proposed. This method vibrates the shield body and effectively loosens mortar caking and soil encrusting the shell. Key findings include the following: (1) The consolidation and wrapping of the shield shell by mortar are partly attributable to the high ground permeability coefficient and cement concentration in the synchronous grout. (2) Frequent shield shutdowns exacerbate mortar consolidation and wrapping. (3) The proposed measures are effective in removing mortar from the shell, and the occurrence of such phenomena can be minimized by enhancing synchronous grouting techniques.

Key words: super-large-diameter shield, mortar consolidation and wrapping, steel sheet pile