基于桩侧摩阻力退化静压桩沉桩效应室内试验  

Experimental Study of Pile Jacking Effect Based on Pile Side Friction Resistance Degradation

作　　者：王永洪[1,2] 金珈民 袁继奎 张东 王东雷 WANG Yonghong;JIN Jiamin;YUAN Jikui;ZHANG Dong;WANG Donglei(College of Civil Engineering,Qingdao University of Technology,Qingdao,China,266033;Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone,Qingdao,China,266033;Shandong Luqiao Group Co.Ltd.,Ji′nan,China,250014;Jianhua Building Materials Co.,Yantai,265200;QingdaoYongyuan Marine Technology Co.,Qingdao,China,266033;Qingdao Green Tech Geotechnical Engineering Co.,Qingdao,China,266033)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]山东省高等学校蓝色经济区工程建设与安全协同创新中心,山东青岛266033 [3]山东省路桥集团有限公司,山东济南250014 [4]建华建材(莱阳)有限公司,山东烟台265200 [5]青岛永元海洋科技有限公司,山东青岛266033 [6]青岛绿色理工岩土工程有限公司,山东青岛266033

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第6期1021-1028,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家重点研发计划项目(2021YFE0113400);山东省自然科学基金面上项目(ZR2022ME143)。

摘　　要：目的开展桩侧摩阻力退化静压桩沉桩效应室内试验,准确反映静压桩在实际沉桩过程中的受力变形特性,解决静压桩沉桩特性研究中难以获得静压桩真实的沉桩特性等问题。方法使用室内试验方式进行大比尺静压桩的分段沉桩试验;基于桩侧摩阻力退化理论,实现分段试验数据的耦合叠加,分析沉桩过程的受力特性,探讨桩侧摩阻力退化对沉桩效应的影响。结果压桩力随贯入深度的增加呈均匀增长,桩侧摩阻力的退化对压桩力的影响较小;基于桩侧摩阻力退化理论修正后桩侧摩阻力整体变化规律较好,在桩段连接处产生的差值基本为0;桩侧摩阻力随着沉桩深度的不断增加而逐渐发挥,曲线整体线性较好;桩端阻力随深度增大呈波动性增长,且在压桩力中的占比较高,维持在50%以上。结论侧摩阻力退化效应的存在对桩基承载力的预测具有较大影响,且退化效应显著性随沉桩深度增大而增大;通过对分段沉桩数据修正后进行叠加耦合可获取静压沉桩特性的准确数据;本研究可为今后静压桩沉桩特性研究提供新的思路。The research on the characteristics of static pressure piles is mostly concentrated in model tests and numerical simulation,and cannot accurately reflect the problems of the real sinking piles of static piles accurately.Based on the degeneration of the pile side motorcycle resistance,this paper conducted a large-scale static stake pile section segmentation pile test.Based on the degradation theory of pile side friction resistance,coupling and stacking of segmented test data is achieved to analyze the stress characteristics of the pile sinking process and explore the influence of pile side friction resistance degradation on the pile sinking effect.As a result,the test results showed that the pressure pile force increased evenly with the depth of the penetration,and the degeneration of the pile side rubbing resistance was less impact on the pressure pile force;Well,the difference in the difference at the pile section connection is basically zero;the resistance power of the pile side is gradually exerted as the depth of the sinking piles,and the overall linearity of the curve is better;The pile force accounts for relatively high,maintaining above 50%.In this paper,the segmented pile sinking test of large scale hydrostatic pile was carried out by indoor test method,and the pile sedimentation characteristics of hydrostatic pile were studied by combining the pile side friction resistance degradation theory,which provides a new idea for the future study of the sinking characteristics of hydrostatic pile.

关 键 词：桩侧摩阻力退化 静压桩 分段沉桩 受力特性 叠加耦合 

分 类 号：TU473.11[建筑科学—结构工程]