特殊地层条件对PHC管桩单桩竖向承载力的影响分析  

Analysis of the Influence of the Special Strata on the Vertical Bearing Capacity of Single PHC Pile

作　　者：牟晓成[1] 刘伦芳[1] 党发宁[1] 

机构地区：[1]西安理工大学,陕西西安710048

出　　处：《水利与建筑工程学报》2014年第4期171-175,共5页Journal of Water Resources and Architectural Engineering

摘　　要：单桩竖向承载力特征值可经估算并通过竖向静载荷试验即试桩来确定,在杂填土、自重湿陷性黄土、液化土及流塑状土层等特殊地层条件下,为避免因估算差异过大而需重复试桩造成浪费,在初步设计时应根据岩土工程勘察报告合理考虑这类特殊地层的影响。以某具体工程为例,重点分析了初步设计估算的试桩参数不能满足设计要求的主要原因是没有合理考虑处于中密的流塑状土层的工程特性,并在考虑该特殊地层的影响下重新进行了试桩参数的估算,通过试验验证了重新估算的特征值满足设计要求,希望对同类工程的设计及施工有所帮助。Characteristic value of vertical bearing capacity of single pile can be determined by estimating and then conducting vertical static load test ,namely pile testing .Under the condition of special strata such as miscellaneous fill ,self weight collapse loess ,liquefiable stratum and plastic-flow stratum ,to avoid the economic waste caused by large estimation error which needs repeated piles testing ,the influence of this kind of strata should be reasonably considered at the initial design stage according to the report of geotechnical investigation .Taking a certain project as an example ,the main reason why the pile testing parameters couldn ’t meet the design requirement was mainly analyzed ,namely ,the engineering characteristics of the plastic-flow stratum of medium density was not given enough consideration .The estimating of pile testing parameters was conducted again considering the influence of this special stratum and the re-estimation value was experimentally validated to meet the design requirements .This study will also be helpful to the design and construction of similar project .

关 键 词：特殊地层 PHC管桩 单桩竖向承载力特征值 静载荷试验 

分 类 号：TU473.11[建筑科学—结构工程]