土工基础

›› 2017, Vol. 31 ›› Issue (4): 383-386.

• 工程实录 •    下一篇

地铁隧道下穿高速公路沉降规律与变形控制技术

刘建美，刘 洋   

  1. (山东省第七地质矿产勘查院,山东临沂 276000)
  • 收稿日期:2016-08-23 修回日期:2016-09-01 出版日期:2017-08-20 发布日期:2017-08-22
  • 作者简介:刘建美（1982-），女，工程师，研究方向为水文地质、工程地质和环境地质。

Settlement Patterns and Deformation Control of a Subway Tunnel beneath a Highway

LIU Jianmei, LIU Yang   

  1. (Shandong No. 7th Institute of Geology & Mineral Exploration, Linyi Shandong 276000)
  • Received:2016-08-23 Revised:2016-09-01 Online:2017-08-20 Published:2017-08-22

摘要： 地铁隧道下穿既有高速公路施工中，往往造成较大地表变形。依托深圳地铁7号线下穿广深高速工程，通过数值计算分析并与监测数据结果相对比，得出了施工过程中引起的地层沉降变化规律：沉降槽截面大致呈正态曲线分布，当隧道间距小于1.0D时，双线隧道开挖引起的路面面沉降槽呈现单凹槽“V”形，而非双凹槽“W”形；隧道与路面呈一定角度时，隧道衬砌可能受偏压作用；全断面注浆可以很好的控制地层最终变形，但施工过程中会造成地层的隆起，施工工程中应加以注意。综合数值模拟和监控量测技术可以掌握围岩变形情况，采取及时的措施对变形量加以控制。

关键词: 数值模拟, 监控量测, 下穿道路, 地铁施工

Abstract: An excessive deformation is often occurred when a tunnel underpass the existing highway. This paper presents a case history of Shenzhen Metro No. 7 Line crossing the GuangzhouShenzhen Expressway. The tunnel excavation was numerically simulated and the deformation results were compared with the construction observation data. The observed settlement data indicate that the ground settlement has a normal distribution. For the double tunnel excavations, when the net spacing between the tunnels is smaller than one diameter of the tunnel diameter, the settlement through on the ground surface has a single V shaped other than W shaped. When the tunnel at the highway is not perpendicular, the eccentric pressure might influence the tunnel liners. The results also indicate that the full section grout can have a better control of the ground subsidence but grouting might also cause ground heaving. Combining the numerical analysis and the construction observation the ground deformation can be effectively controlled.

Key words: Numerical Simulation, Monitoring and Measurement, Underpass, Subway Construction