Design and observation of deep excavation of eastern section of Slender West Lake tunnel
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摘要: 扬州瘦西湖隧道湖东段基坑全长580 m，宽度10.2～22.6 m，深度1.24～25.9 m，是典型的狭长且深度差异大的基坑工程。本工程作为扬州市重点城市规划项目，工期紧张，工程造价控制严格。针对基坑特点及周边环境特点，随着基坑深度的增加，依次采用地下连续墙、钻孔灌注桩+止水帷幕、SMW工法桩、水泥土搅拌桩挡墙、放坡作为围护结构形式，结合水平内支撑体系，达到了较好的支护效果。基坑工程支护系统设计方案的顺利实施为保证基坑安全、节省工程造价及实现预定的工期目标创造了有利条件。Abstract: The excavation of the eastern section of Slender West Lake tunnel is a typical long-narrow one and the excavation depth varies greatly. As a major urban planning project in Yangzhou, this project has a strict time limit. Several retaining systems are adopted considering the excavation depth in different districts. As the excavation depth increases, this excavation adopts diaphragm walls, cast-in-situ bored piles and waterproof curtains, SMW piles, soil-cement retaining walls and slope excavation in turn. The design of excavation supporting system has provided convenience for its safety, saved the cost and also guaranteed the construction period of the whole project.
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Keywords:
- wear lake tunnel /
- long-narrow excavation /
- depth /
- bracing design
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[1] 中铁第四勘察设计院集团有限公司. 扬州瘦西湖隧道工程岩土工程勘察报告[R]. 扬州: 中铁第四勘察设计院集团有限公司, 2011. (China Railway Siyuan Survey and Design Group Co., Ltd., Geotechnical investigation report of the Yangzhou Slender West Lake tunnel[R]. Yangzhou: China Railway Siyuan Survey and Design Group Co. Ltd, 2011. (in Chinese)) [2] DBJ 08—61—97基坑工程设计规范[S]. 1997. (DBJ 08—61—97 Code for design of excavation engineering[S]. 1997. (in Chinese)) [3] 刘国彬, 王卫东. 基坑工程手册[M]. 2版. 北京: 中国建筑工业出版社, 2009. (LIU Guo-bin, WANG Wei-dong. Excavation engineering handbook[M]. 2nd ed. Beijing: China Architecture & Building Press, 2009. (in Chinese))
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