黏性土中钢管桩承载力的静力触探设计方法  

A DESIGN METHOD FOR BEARING CAPACITY OF STEEL PIPE PILES IN CLAYEY SOIL BASED ON CONE PENETRATION TESTS

作　　者：王磊[1] 俞峰[1] 王子郡 WANG Lei;YU Feng;WANG Zijun(Institute of Foundation and Structure Technologies,Zhejiang Sci-Tech University,Zhejiang Provincial Engineering and Technology Research Center of Assembly-Concrete Industrialized Buildings,Hangzhou 310018,China)

机构地区：[1]浙江理工大学基础结构技术研究所,浙江省装配式混凝土工业化建筑工程技术研究中心,杭州310018

出　　处：《工业建筑》2021年第10期163-169,共7页Industrial Construction

基　　金：浙江省自然科学基金重点项目(LZ17E080002);浙江省教育厅科研资助项目(Y201942631)。

摘　　要：基于静力触探试验(CPT)指标的钢管桩承载力设计方法目前大多适用于砂性土。在前人工作基础上,提出了针对黏性土地基的钢管桩承载力CPT设计方法。通过引入最终土塞率指标来考虑土塞效应,并对应力折减、挤土效应、侧阻退化、桩端影响区等关键问题做优化考虑。经过与原位试桩实测数据的对比,表明该方法的预测精度比已有方法提升明显,与针对砂性土的已有设计方法合并使用,可实现天然成层土地基中钢管桩承载力的工程计算。Existing bearing-capacity design methods of piles based on the cone penetration test( CPT) indices are mostly suitable for the situation of steel pipe piles in sandy soil. On the basis of existing research,a CPT-based design method for the bearing capacity of steel pipe piles in clayey soil was proposed. A index of final-plug length ratios( FLR) was introduced to consider the effect of soil plugging. Furthermore,optimization was conducted on some key issues such as stress reduction,soil-squeezed effect,deterioration of lateral resistance and influence zones at pile tips. The prediction accuracy of the recommended method was in comparison with a full-scale pile in-situ and it showed that the method was more accurate than those of existing methods. By combining the method with existing ones suitable for sandy soil,engineering calculations for the bearing capacity of steel pipe piles in natural stratified soils could be realized.

关 键 词：钢管桩 静力触探 黏性土 疲劳退化 桩端影响区 

分 类 号：TU473.1[建筑科学—结构工程]