岩土力学 ›› 2022, Vol. 43 ›› Issue (S2): 414-424.doi: 10.16285/j.rsm.2021.1682

• 岩土工程研究 • 上一篇    下一篇

超大矩形顶管盾构隧道近接下穿高铁施工 加固方案对比分析

崔光耀1，麻建飞2，宁茂权3, 4，唐再兴3, 4，刘顺水3, 4，田宇航1   

  1. 1. 北方工业大学 土木工程学院，北京 100144；2. 北京交通大学 土木建筑工程学院，北京 100044； 3. 中铁第四勘察设计院集团有限公司，湖北 武汉 430064；4. 海峡（福建）交通工程设计有限公司，福建 福州 350004
  • 收稿日期:2021-10-06 修回日期:2022-02-16 出版日期:2022-10-10 发布日期:2022-10-09
  • 通讯作者: 麻建飞，男，1997年生，博士研究生，主要从事隧道与地下工程方面的研究。E-mail: majfncut@163.com E-mail:cyao456@163.com
  • 作者简介:崔光耀，男，1983年生，博士，教授，主要从事隧道与地下工程方面的教学与研究工作。
  • 基金资助:
    国家自然科学基金（No.52178378）；中铁第四勘察设计院集团有限公司科技研究开发项目（No.2020K143）。

Comparative analysis of construction reinforcement scheme of super large rectangular pipe jacking shield tunnel close to and under high-speed railway

CUI Guang-yao1, MA Jian-fei2, NING Mao-quan3, 4, TANG Zai-xing3, 4, LIU Shun-shui3, 4, TIAN Yu-hang1   

  1. 1. School of Civil Engineering, North China University of Technology, Beijing 100144, China; 2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 3. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan, Hubei 430064, China; 4. Haixia Traffic Engineering Design Co., Ltd., Fuzhou, Fujian 350004, China
  • Received:2021-10-06 Revised:2022-02-16 Online:2022-10-10 Published:2022-10-09
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(52178378) and the Research and Development Project for Scientific and Technological of China Railway Siyuan Survey and Design Group Co., Ltd., (2020K143).

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摘要： 为保证超大矩形顶管盾构隧道近接下穿高铁的施工安全，以某矩形顶管盾构涉铁工程为背景，研究软弱地层中超大矩形顶管盾构近接高铁施工的安全性。结果表明：软弱地层中超大矩形顶管盾构近接高铁施工时轨道沉降和管节安全系数远超控制阈值，必须采取施工加固方案；采取超前注浆可使轨道沉降减小 58.20%，管节最小安全系数提高至 1.35；采用人工挖孔桩+D型钢便梁可使轨道沉降减小 63.05%，最小安全系数增至 9.49；采用桩板结构加固可使轨道沉降减小 70.90%，最小安全系数增至9.00；人工挖孔桩+D型钢便梁加固方案和桩板结构加固方案的效果明显优于超前注浆的加固效果，推荐在下穿待建高铁段采用桩板结构加固方案，在下穿既有高铁段采用人工挖孔桩+D型钢便梁加固方案。现场监测结果表明：超大矩形顶管盾构在近接下穿待建福厦高铁段采用桩板结构后，顶管掘进导致的地表沉降最大值为 3.25 mm，在近接下穿既有杭深线段采用人工挖孔桩+D型钢便梁后，高铁轨道最大沉降仅为1.65 mm，均远小于沉降阈值，超大矩形顶管盾构顺利近接下穿待建福厦线和既有杭深线。研究结论可为类似大尺寸隧道的近接工程提供参考。

关键词: 隧道工程, 矩形顶管盾构, 近接施工, 加固方案, 软弱地层

Abstract: To ensure the construction safety of super-large rectangular pipe jacking shield tunnel adjacent to the high-speed railway, based on an actual railway related project, the safety of super-large rectangular pipe jacking shield close to high-speed railway in soft stratum is studied. The results show that the track settlement and pipe segment safety factor far exceed the control threshold during the construction, so the reinforcement scheme must be adopted. The track settlement can be reduced by 58.20% and the minimum safety factor of pipe segment can be increased to 1.35 by adopting advance grouting scheme. Using manually dug pile and D-shaped beam can reduce the track settlement by 63.05% and increase the minimum safety factor to 9.49. After adopting the pile-plate reinforcement scheme, the track settlement can be reduced by 70.90% and the minimum safety factor can be increased to 9.00. The reinforced effects of manually dug pile and D-shaped beam scheme and pile-plate scheme is significantly better than that of advance grouting. It is recommended to adopt the pile-plate scheme in the section under the high-speed railway to be built, and the manually dug pile and D-shaped beam scheme in the section under the existing high-speed railway. The on-site monitoring results show that the maximum surface settlement caused by pipe jacking tunneling is 3.25 mm after the super-large rectangular pipe jacking shield passes through the Fuzhou-Xiamen railway section to be built. After the manually dug pile and D-shaped beam is adopted for the existing Hangzhou-Shenzhen section, the maximum settlement of the high-speed railway track is only 1.65 mm. Both track settlement and surface settlement are far less than the settlement threshold. The super-large rectangular pipe jacking shield successfully crosses the Fuzhou-Xiamen Railway and Hangzhou-Shenzhen Railway. The research conclusion can provide reference for similar large-scale tunnel proximity engineering.

Key words: tunnel engineering, rectangular pipe jacking shield tunnel, approach construction, reinforcement scheme, weak stratum

中图分类号: TU457
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