土工基础

›› 2018, Vol. 32 ›› Issue (3): 273-278.

• 工程实录 • 上一篇    下一篇

软土深基坑分区施工对邻近顶管电力隧道变形影响研究

王国权1，杨兰强1，蒋 颖2   

  1. (1.宁波市城建设计研究院有限公司，浙江宁波 315010；2.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:2018-03-05 修回日期:2018-03-20 出版日期:2018-06-22 发布日期:2018-06-26
  • 作者简介:王国权(1980-)，男，本科，高级工程师，研究方向为地下工程结构设计、岩土工程设计。

Deformation of the Electrical Utility Tunnel Induced by the Adjacent Zoned Deep Excavation in Soft Soils

WANG Guoquan1， YANG Lanqiang1， JIANG Ying2   

  1. （1.Ningbo Urban Construction Design & Research Institute Co., Ltd., Ningbo 315010；
    2.Central and Southern China Municipal Design & Research Institute Co., Ltd., Wuhan 430010）
  • Received:2018-03-05 Revised:2018-03-20 Online:2018-06-22 Published:2018-06-26

摘要： 宁波某软土深基坑临近保护等级较高的顶管电力隧道，基坑采用分区施工的方案来控制基坑变形影响。借助MIDAS GTS NX有限元软件建立基坑对邻近电力隧道的三维计算模型。对基坑分区开挖的过程进行动态模拟，获取基坑开挖过程中的围护桩、周围土体、电力隧道变形结果，并与实测结果对比。研究表明，宁波软土地区深基坑，采用分区施工的方案，能起到很好的变形控制作用，采用HSM土体本构模型能较好反映土体应力-应变关系，基坑开挖对邻近电力隧道变形影响与实测数据基本吻合。

关键词: 软土, 深基坑, 分区施工, 电力隧道, 数值模拟, 监测

Abstract: A deep excavation is required adjacent to a highlevel protected electricity utility tunnel in soft soils of Ningbo City. The excavation adopts the scheme of partition construction to control the influence of foundation pit deformation. By using MIDAS GTS NX, a 3D model of excavation adjacent the electricity utility tunnel was established by using the staged analytical model of excavation. The deformation results in supporting piles, surrounding soils as well as in the electricity utility tunnel during various stages of excavation were obtained. Compared with the measured results, it is concluded that zoned construction technique could help reducing the deformations in the deep excavations in soft soils. The HSM soil constitutive model was used to in the analysis to accurately reflect the stressstrain relationship of soft soils. The deformation effects of excavation on adjacent electricity utility tunnel were consistent with the monitored data.

Key words: Soft Soils, Deep Excavations, Zoned Construction, Electricity Utility Tunnel, Numerical Simulations, Construction Monitoring