施工技术 2015年9月下 98 CONSTRUCTION TECHNOLOGY 第44卷第18期 D01:10.7672/gjs2015180098 承压砂土地层桩洞法施工动态效应及其控制研究* 宋云财 (中国铁建大桥工程局集团有限公司，天津300300) [摘要]以北京地铁7号线六标地铁车站为工程背景，采用FLAC3D有限差分软件对工程八导洞开挖、车站主体结 构施工进行模拟，研究了桩洞法施工中八导洞施工工序和几种不同导洞开挖方案引起的地层沉降变化规律.研究 表明，承压砂土地层中桩洞法先开挖上层导洞比先开挖下层导洞引起的地表沉降小；在车站施工的工序中，导 洞是引起地表沉降的主要因素，进人扣拱阶段后，地层开始隆起，地表沉降逐步减小；基于以上认识，对比分析了六 导洞方案与八导洞方案引起的变形特性，提出了承压砂土地层柱洞法施工地表沉降控制的施工建议. [关键词]地下工程：暗挖车站；桩洞法；群洞效应；数值模拟 [中图分类号]U45 [文献标识码]A [文章编号]1002-8498(2015)18-0098-07 Construction Dynamic Effect and Control Research of PBA at Confined Sandy Layers Song Yuncai China Railcay Construction Bridge Engineering Bureau Group Co.Ld.Tianjin 300300 China) Abstract:This paper takes Beijing metro line 7 bid-section 6 station as the engineering background and analyzes the excavation of eight pilots and the construction of station structure with the FLAC3D which is a finite difference software.The change law of ground settlement caused by the construction procedure and the excavation method of eight pilots during construction with pile beam arch method are researched. The research shows that the lower ground settlement caused by construction in which the up pilots be excavated firstly in confined sandy soil layer.Compared with other construction procedures the pilots exeavation is the major factor of ground settlement.In the buckle arch construction the ground heave is appeared and the ground settlement gradually reduces.Based on the above research this paper analyzes the deformation behavior caused b...
承压砂土地层桩洞法施工动态效应及其控制研究.pdf
