饱和黄土区CFG桩与振动沉管碎石桩复合地基承载

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摘要国家重点工程西部管道工程兰州原油末站超大型油罐群,是我国首次在饱和黄土地基修建的超大型储油设施。由于饱和黄土地基天然承载力仅为60 kPa, 油罐区地基采用CFG 桩复合地基进行处理,工艺装置区采用振动沉管碎石桩进行地基处理。现场开展了振动沉管碎石桩桩体重型动力触探试验、振动沉管碎石桩单桩复合地基静载荷试验、CFG 单桩及单桩复合地基静载荷试验,确定复合地基的承载力。通过试验得出,振动沉管碎石桩单桩复合地基承载力特征值为66 kPa。不满足设计要求的70 kPa；而CFG单桩复合地基承载力特征值为275 kPa,满足15万m³油罐复合地基承载力270 kPa 的设计要求。探讨了两种复合地基的承载特性,试验研究成果对饱和黄土地基处理提供了借鉴和经验。

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关键词 ：饱和黄土, CFG桩, 碎石桩, 承载力

Abstract：The large oil tank group in Lanzhou, which is a part of the China's state key project—the western oil pipe line project, is constructed on the saturated loess stratum for the first time in China. Due to the low natural bearing capacity, only 60 kPa, that the ground treatment should adopt the CFG pile composite method is applied in oil tank area. The vibrating sinktube detritus pile composite method is applied in process plant area. The dynamic penetration tests, single-pile static load tests and composite foundation static load tests are carried out to determine the bearing capacity of the composite foundation. Through the field experimental research, it is found that the bearing capacity of the vibrating sinktube detritus pile composite is only 66 kPa, which does not meet the design requirements of 70 kPa. The bearing capacity of CFG pile composite is 275 kPa, which can meet the design requirements of 270 kPa. The bearing features of the CFG pile composite ground and the vibrating sinktube detritus pile composite ground are discussed to provide references for similar projects.

Key words： saturated loess CFG pile gravel pile bearing capacity

收稿日期: 2013-06-15

TU473.1

基金资助:长江学者和创新团队发展计划资助（IRT1139）

作者简介: 王旭(1965- )，男，河南郑州人，工学博士，教授，主要从事桩基础与土工设计理论方面的研究工作。E-mail: publicwang@163.com。

引用本文:

特性试验研究. 饱和黄土区CFG桩与振动沉管碎石桩复合地基承载[J]. 岩土工程学报, 2013, 35(zk2): 1062-1065. WANG Xu, ZHANG Yan-jie, JIANG Dai-jun, LIU De-ren, JIANG Peng-cheng. Experimental research on bearing features of CFG pile composite ground and vibrating sinktube detritus pile composite ground on saturated loess. Chinese J. Geot. Eng., 2013, 35(zk2): 1062-1065.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2013/V35/Izk2/1062

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