长江科学院院报 ›› 2012, Vol. 29 ›› Issue (1): 74-78.

• 全国土工离心模拟技术学术交流会专栏 • 上一篇    下一篇

软土地区新建盾构隧道下穿越既有隧道的离心模拟研究

马险峰a,b, 何蔺荞b, 王俊淞b   

  1. 同济大学 a.岩土及地下工程教育部重点实验室;b.地下建筑与工程系,上海200092
  • 收稿日期:2011-11-07 出版日期:2012-01-01 发布日期:2012-01-10
  • 作者简介:马险峰(1972-),男,河南沈丘人,副教授,硕士生导师,主要从事离心模型试验、地下结构抗震、数值分析等方面的研究和教学

 Centrifuge Modeling on the Effects of Shield Tunnel Crossing Belowthe Existing Tunnels in Soft Clay

MA Xian-feng1,2, HE Lin-qiao 2, WANG Jun-song 2   

  1. 1.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University, Shanghai200092, China;2.Department of Geotechnical Engineering, Tongji University, Shanghai200092, China
  • Received:2011-11-07 Online:2012-01-01 Published:2012-01-10

摘要: 随着地铁网络不断完善,新建盾构隧道近距离穿越既有隧道的现象越来越多。盾构隧道近距离穿越既有隧道的影响问题,比常规盾构施工的研究更为复杂。采用离心模型试验对盾构下穿越对既有隧道以及周围地层的影响进行了研究。选用排液法在离心场中模拟盾构施工,实现了在不停机状态下模拟隧道开挖卸载、地层损失和注浆过程,并分析了盾构下穿越施工引起的地层及既有隧道的纵向位移变化规律。研究成果可为盾构近距离施工控制措施提供参考。

关键词: 盾构隧道, 下穿越, 既有隧道, 离心模型试验

Abstract: The impact of newly-built shield tunnel which crosses the nearby tunnel is much more complicated than ordinary shield tunneling in intact soil strata. Centrifuge modeling was performed to study the effects of shielding tunneling on the nearby strata and the existing tunnels. In the centrifuge model test, fluid-discharge method in the centrifuge field was employed to simulate the shield construction. The processes of excavation unloading, ground loss and grouting were simulated without stopping the excavation. Besides, the settlement and longitudinal deformation of the nearby strata and the existing tunnels induced by shielding tunneling below were analyzed. The research results will be referential for the control over shield construction near existing tunnels

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