施工技术 2013年1月下 92 CONSTRUCTION TECHNOLOGY 第42卷第2期 土压盾构在砂性土中施工关键技术研究 王新，沈奇2 (1.上海城市建设设计研究总院，上海200125；2.上海城建市政工程（集团）有限公司，上海200065) [摘要]对杭州地铁2号线区间段施工进行现场跟踪，提出砂性土中盾构施工的主要技术难题，并对施工中的关键 技术进行了总结分析.其中采取放慢推进速度均匀推进、改良同步注浆材料、加强二次补浆管理和对注浆补浆设 备养护等措施能够较好地控制地表沉降.向刀盘前方注入膨润土浆液，并通过泡沫改良土稳定土压，持续出土. 向刀盘前方和盾构侧面注人膨润土浆液，可以降低盾构推力和减小刀盘弯矩.采取有效降水止水措施可减少加固 薄弱区可能造成的工程风险. [关键词]隧道工程；土压平衡；盾构；砂性土：施工技术 [中图分类号]TU455 [文献标识码]A [文章编号]1002-8498(2013)02-0092-03 Study of Key Technology on EPB Shield Construction in Sandy Soil Wang Xin'.Shen Qi2 (1.Shanghai Urban Construction Design Research Institute Shanghai 200125 China; 2.Shanghai Urban Construction Municipal Engineering Group)Co.Lad.Shanghai 200065 China) Abstract:In this paper the scene of Hangzhou Metro Line 2 interval segment construction was tracked and the main technical problems were proposed which shield constructed in sandy soils.Then the key technology of construction was analyzed.Taking to slow down the advanced speed and uniform propulsion improved synchronization grouting material to strengthen management of the secondary slurry and equipment maintenance were better measures to control surface settlement.Bentonite slurry which was injected into the front of the cutter and the soil improved by foam were used to stabilize the soil pressure and transport out of soil continued.Injecting bentonite slurry into the.front and side of the shield could reduce the thrust of the shield and reduce the moment of the cutter.Taking effective precipitation and sealin...
土压盾构在砂性土中施工关键技术研究.pdf
