三线小净距隧道盾构施工次序及开挖面纵向间距优化研究

陈大权; 曾思斌; 张海洋; 李国伟; 汪优

doi:10.3724/j.gyjzG23103017

三线小净距隧道盾构施工次序及开挖面纵向间距优化研究

doi: 10.3724/j.gyjzG23103017

1. 中铁二局第五工程有限公司, 成都 610073;
2. 中南大学土木工程学院, 长沙 410075

基金项目:

国家自然科学基金项目(51778633)

2022年度广州地铁设计研究院股份有限公司科研立项项目(KY-2022-014)

中国铁建股份有限公司2022年度科技研究开发计划及资助课题(2022-C1)

中铁二局集团有限公司科技开发项目(J2019-ZD04)。

中铁二局集团有限公司科技研究开发计划课题(2022-B-4)

详细信息

作者简介:
陈大权,硕士,高级工程师,主要从事城市轨道交通施工、设计相关工作,1016863661@qq.com。

通讯作者:
汪优,博士,副教授,主要从事地下工程相关教学及研究工作,ywang1920@csu.edu.cn。

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- 被引次数: 0
出版历程
- 收稿日期: 2023-10-30
- 网络出版日期: 2025-10-24

Optimization of Shield Construction Sequence and Excavation Face Longitudinal Spacing in Small-Clearance Three-Lane Tunnels

1. Fifth Engineering Company CREGC, China Railway Second Bureau, Chengdu 610073, China;
2. School of Civil Engineering, Central South University, Changsha 410075, China

摘要

摘要: 随着城市轨道交通迅速发展,出现了大量的小净距隧道盾构项目,其中三线小净距隧道施工设计理论目前仍未建立完善。依托实际工程,针对施工次序进行优化分析,设计了4种开挖工况,考虑了隧道开挖面之间的纵向间距对地表沉降、管片位移和围岩压力的影响规律。结果表明:4种工况沉降槽均呈V形,宽度均约为55 m (9D,D为隧道洞径);先开挖中间隧道的工况4沉降峰值为10.16 mm,小于先开挖两侧隧道工况2的11.10 mm;单线施工时,地表沉降范围为开挖面后方2.5D处至前方1.5D处;相邻线路同时施工且轴线间距小于20 m时,2条隧道的掌子面至少保持16m (2.5D)纵向间距;先行隧道另一侧存在既有隧道时,开挖面纵向间距至少保持12 m (2D),以减小对地表沉降、管片位移和围岩压力的影响。
- 三线小净距隧道 /
- 开挖次序 /
- 开挖面纵向间距 /
- 数值模拟
Abstract: With the rapid development of urban rail transit, a large number of small-clearance tunnel shield projects have emerged, among which the theory of small-clearance tunnel construction design for three-lane tunnels has not yet been well established. Based on an actual project, this paper conducted an optimization analysis of the construction sequence, designed four excavation conditions, and examined the influence of the longitudinal spacing between tunnel excavation surfaces on surface settlement, segment displacement, and surrounding rock pressure. The results showed that: the sinkholes under the four conditions were all V-shaped, with a width of approximately 55 m (9D); the peak settlement in Case 4, where the middle tunnel was excavated first, was 10.16 mm, smaller than that in Case 2, where the tunnels on both sides were excavated first (11.10 mm); the range of ground surface settlement extended from 2.5D behind the excavation face to 1.5D ahead of the excavation face in the case of singlelane construction; when adjacent lines were constructed simultaneously and the axis spacing was less than 20 m, the working faces of the two tunnels maintained at least 16 m (2.5D) longitudinal spacing. When existing tunnels were present on the other side of the first tunnel, the longitudinal spacing of the excavation faces was kept at least 12 m (2D) to minimize the impact on ground surface settlement, segment displacement, and surrounding rock pressure.
- small-clearance three-lane tunnel /
- excavation sequence /
- longitudinal spacing between excavation faces /
- numerical simulation

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参考文献(15)

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