Design and optimization of old excavation deepening under complexboundary conditions
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摘要: 以广州某复杂边界条件深大基坑工程为背景，基于该基坑属于旧基坑加深的工程特点，通过选择复合土钉墙与桩锚（预应力）支护相结合的组合支护结构方案，以及合理的桩间距及桩间止水帷幕等措施，既保证了基坑及周边环境的安全和基坑工程的顺利实施，也保证了工程的经济合理性，分析基坑实施期间的各项监测数据和受力变形特点表明该组合支护形式取得了良好的实施效果。Abstract: Based on an old excavation deepening project with complex boundary conditions in Guangzhou, a combined scheme of composite soil-nailing wall and pile-anchor retaining structure scheme is selected. The reasonable pile spacing and pile waterproof curtain and other measures are adopted to ensure the safety of excavation and the surrounding environment as well as its smooth constrcution. The monitoring data and the deformation characteristics of the retaining structure show that the combined support achieves satisfactory effectiveness.
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[1] 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)) [2] 广州市番禺市桥建筑设计院有限公司. 番禺罗家商业广场岩土工程勘察报告[R]. 广州: 广州市番禺市桥建筑设计院有限公司, 2008. (Geotechnical Engineering Investigation Report of Panyu commercial plaza[R]. Guangzhou: Guangzhou City Panyu Bridge Building and Design Institute Limited, 2008. (in Chinese)) [3] JGJ 120—99 建筑基坑支护技术规程[S]. 1999. (JGJ 120—99 Technical Specification for retaining and protection of building foundation excavations[S]. 1999. (in Chinese)) [4] GB 50010—2010 混凝土结构设计规范[S]. 2010. (GB 50010—2010 Code for design of concrete structures[S]. 2010. (in Chinese))
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