土工基础

土工基础 ›› 2020, Vol. 34 ›› Issue (3): 331-334.

• 专题论述 • 上一篇    下一篇

盾构隧道下穿河堤的安全影响分析

肖照阳，李 逸，邹 琦，杨 明   

  1. （中国市政工程中南设计研究总院有限公司，武汉 430010）
  • 收稿日期:2019-08-20 修回日期:2019-08-30 出版日期:2020-06-20 发布日期:2020-06-21
  • 作者简介:肖照阳（1991-），男，助理工程师，研究方向为结构设计。

Impact of Shielded Tunnel Excavation on the River Levees Crossing

XIAO Zhaoyang, LI Yi, ZOU Qi, YANG Ming   

  1. (Central and Southern China Municipal Design & Research Institute Co. Ltd., Wuhan 430010)
  • Received:2019-08-20 Revised:2019-08-30 Online:2020-06-20 Published:2020-06-21

摘要： 盾构隧道建设时常会遇到下穿河堤的情况，由于盾构在掘进过程中会造成土层位移，对河堤的安全产生不利的影响，因此在盾构下穿河堤过程中必须对河堤的安全进行分析研究。以某隧道工程为背景，采用有限元分析软件FLAC3D分析研究了盾构隧道在下穿河道南岸大堤过程中对河堤安全产生的影响。研究结果表明，南岸大堤在盾构隧道下穿过程中会产生沉降，最大沉降位移为4.94 mm，小于规范限值15 mm，河堤处于安全状态。同时为了提高施工质量，降低施工风险，根据盾构设计方案提出了严格控制盾构推进速度，并及时进行同步注浆和二次注浆，以减小对土层的扰动等施工建议，对今后其他盾构隧道下穿河堤的工程项目具有一定的指导意义。

关键词: 盾构隧道, 河堤安全, 有限元计算, 施工建议

Abstract: Shielded tunnel excavations often encounter the situation of under crossing the river leveesin the urban metro construction. The soil movement induced by the shielded tunnel excavation might have adverse impact on the river levee above so that it is necessary to evaluate the potential influence of tunnel excavation on the safety of levees. This paper presents a case history of a metro tunnel excavation. The influence of shielded tunnel excavation on the south side of the river levee above was simulated by a commercial finite element analysis software FLAC3D. The results indicate that the maximum settlement induced by the tunnel excavation is 4.94 mm and this value is less than the allowable value of 15 mm defined in the design code. The river levee is determined to be safe. To improve the construction quality and to reduce tunnel excavation risk, the excavation penetration rate is optimized based on the tunnel design plan. At the same time, the grouting while excavation and after excavation are also planned so that potential soil disturbance induced by the construction and be reduced.

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