长短管桩在含浅部持力层的地基中的应用研究  

Research on Application of Long-Short-Pipe-Piles in the Ground with Shallow Bearing Strata

作　　者：丁建文[1] 石名磊[1] 刘维正[1] 

机构地区：[1]东南大学交通学院岩土工程研究所,南京210096

出　　处：《防灾减灾工程学报》2009年第6期696-701,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：建设部研究开发项目(2008-k2-12)资助

摘　　要：在含良好浅部持力层的地基中采用长短桩基础,可以充分发挥浅部持力层这一天然资源的良好承载性能。本文依托张家港地区某静压管桩长短桩工程实例,对含典型浅部持力层的地基中长短管桩的承载特性进行了研究。现场测试和计算分析结果表明,桩端置于浅部粉细砂层的短桩与桩端置于深部粉质粘土层的长桩的单桩承载力接近,设计极限荷载下,短桩桩顶沉降明显大于长桩,但均小于一般桩基沉降控制标准;长短组合桩中,短桩主要用于提高承载力,长桩主要用于控制沉降。本文结果可为长短组合桩理论研究和优化工程设计提供有益参考。The long-short-pile foundation can sufficiently exert the bearing capacity of shallow bearing stratum as the natural resource in the ground. The bearing properties of the long-short-pile in typical ground with shallow bearing stratum were studied in this paper based on the static pressure pipe pile in Zhangjiagang. The results indicate that the bearing capacity of the short pile with the end on the silty fine sand stratum is nearly the same as the long pile with the end on the silty clay stratum. The settlement of the short pile is much more than that of the long pile under design ultimate load, but both of them are lower than the settlement control standard of ordinary pile foundation. The main characteristics of the long- short-pile foundation is that the short pile can provide bearing capacity while the long pile can control the deformation. The results in this paper can provide valuable reference on theoretical study and optimization design of the long-short-pile foundation.

关 键 词：浅部持力层 长短桩 静压管桩 承载特性 

分 类 号：TU473[建筑科学—结构工程]