低强度桩复合地基稳定性及变形研究现状分析  

Current research situation of low strength piles composite foundation stability and deformation

作　　者：郭超[1,2] 闫澍旺[1] 宋绪国[2] 陆征然[1] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]铁道第三勘察设计院集团有限公司,天津300142

出　　处：《建筑结构学报》2010年第S2期292-297,共6页Journal of Building Structures

摘　　要：低强度桩复合地基在提高地基强度,减少基础沉降等方面发挥着重要作用。低强度混凝土桩复合地基既可以充分发挥桩体强度,又可以利用天然地基土的强度,但是对于桩与土的相互作用认识得不清。目前规范在计算低强度桩复合地基稳定性时采用条分法,在计算其沉降变形时采用复合模量法和分层总和法,以上计算方法未能满足应力应变协调理论。针对以上问题,有学者采用了数值模拟、原位测试对比等分析方法,研究低强度桩复合地基的稳定性及变型特性,并且取得了一些成果。但是,由于地基和荷载的性质差异性较大,所以尚未总结出一种计算低强度桩复合地基稳定性和变型特性的科学方法。在总结既有成果的基础上,针对荷载、桩土强度、桩间距、垫层厚度等影响低强度桩复合地基稳定性及变形因素进行分析,为低强度桩复合地基的进一步研究提供参考。Low strength piles(LSP) composite foundation played an important role in increasing the soft soil foundation strength and decreasing the foundation settlement.The piles strength potentiality could be fully developed by the LSP composite foundation,and the soil bearing capacity strength also could be fully utilized,but the rules of the soil and the piles interaction distributing were blurred.The slices method was used to calculate the LSP composite foundation stability,and the composite modulus method and layer settlement accumulation method was used to calculate the LSP composite foundation settlement in current code.The LSP composite foundation force received and deformation could not be explained by the above calculation methods in using the stress-strain compatible theory.The numerical simulation method and in-situ soil test contrast analysis were adopted by some scholars in analyzing the LSP composite foundation stability and deformation,and some achievements were made.However,as the great differences of the foundation and the soil properties,and the variety of loading conditions,the scientific calculation method of the LSP composite foundation stability and deformation had not been carried out.In this paper,some problems concerned the LSP composite foundation stability and deformation were put forward such as the load,the piles and the soil strength,the space of the piles,the cushion thickness and so on,on the basis of the existing results,which could be a significant reference for later research on the LSP composite foundation.

关 键 词：低强度桩 复合地基 稳定性 变形 

分 类 号：TU473.1[建筑科学—结构工程]