深圳机场填海区欠固结软基超大深基坑的设计

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摘要在欠固结的软基中开挖深基坑的技术难度和风险很大。以深圳机场扩建工程轨道交通枢纽基坑工程为背景，分析了有深厚淤泥层的填海地区大型基坑的难点及相应对策，介绍了该基坑咬合桩+锚碇、锚索的支护方案；在设计中采用淤泥层排水固结强度增长规律取用强度指标，结合锚碇、锚索的受力特征对围护结构做了有限元计算分析；基坑监测结果表明计算结果与实际相符，验证了支护设计安全、合理。|　　

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	马驰
	刘国楠

关键词 ：欠固结软土, 基坑, 固结强度增长, 锚碇, 咬合桩, 　　

Abstract： The excavation of deep foundation pits in underconsolidated soils has been a problem in the field of geotechnical engineering. Based on the excavation of rail transport hub of Shenzhen Airport, the excavation difficulties and countermeasures in soft soils are analyzed piles. The supporting scheme of interlocking anchors, and cables is introduced. The increase law of consolidation of silt is adopt to estimate its strength. Combine with the stresses of anchors and cables the finite element analysis is performed. The monitoring results show that the calculated results agree with the measured ones. The safety and rationality of the supporting design are validated.|　　

Key words： underconsolidated soft soil excavation consolidation strength increase anchorage interlocking pile

收稿日期: 2012-11-13 出版日期: 2012-11-13

TU413

作者简介: 马驰(1980– )，男，博士研究生，助理研究员、主要从事基坑支护、地基处理等方面的工程设计、技术咨询工作。

引用本文:

马驰, 刘国楠. 深圳机场填海区欠固结软基超大深基坑的设计[J]. 岩土工程学报, 2012, 34(suppl): 536-541. MA Chi, LIU Guo-nan. Design of large and deep excavation in underconsolidated soils in reclaimed areaof Shenzhen Airport. Chinese J. Geot. Eng., 2012, 34(suppl): 536-541.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2012/V34/Isuppl/536

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