Static Capacity Analysis of Augered, Pressure-Injected Displacement Piles
Static Capacity Analysis of Augered, Pressure-Injected Displacement Piles
复制标题
螺旋注压位移桩的静力分析
DOI：
10.1061/40601(256)84
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
W. NeSmith
中科院分区：
文献类型：
--
作者：
W. NeSmith
在松散至中等密度的颗粒状材料中，螺旋压注置换（APID）桩的承载力明显高于常规螺旋灌注（APG）桩。在APID安装过程中，在浇筑之前，在桩周围的材料中会产生Ko到Kp环境，这种情况会导致土壤中的轴阻力增加，而位移会导致土壤致密化。当前的螺旋浇筑设计方法假设桩附近存在Ko至Ka条件，因此，与传统APG桩相关的知识体系预计将成为一个保守的基线，从该基线开始开始评估APID桩系统的承载力。本文提供了一个经验设计方法的APID桩，基于28个负载测试，主要是在粒状材料和各种地质环境的评价。一个设计过程，包括修改土壤类型的粗粒度范围内的CPT和SPT勘探信息。
Augered, pressure-injected displacement (APID) piles develop significantly higher capacities than conventional augercast (APG) piles in loose to medium dense, granular materials. During APID installation, a Ko to Kp environment is created in the materials surrounding the pile immediately prior to casting, and this condition results in increased shaft resistance in soils where displacement leads to densification. Current augercast design methodologies assume a Ko to Ka condition in the vicinity of the pile, and thus the body of knowledge associated with conventional APG piles would be expected to be a conservative base line from which to begin assessing the capacity APID pile systems. This paper offers an empirical design methodology for APID piles, based on evaluation of 28 load tests, primarily in granular materials and in a variety of geologic settings. A design process that includes modification for soil types within the coarse-grained range is presented for CPT and SPT exploratory information.