管桩挤土效应消除黄土湿陷效果试验研究  

EXPERIMENTAL STUDY ON LOESS COLLAPSIBILITY ELIMINATION THROUGH COMPACTION EFFECT OF PIPE PILE

作　　者：张明 胡栋科 张建设 朱会强 贾明钊 ZHANG Ming;HU Dongke;ZHANG Jianshe;ZHU Huiqiang;JIA Mingzhao(Zhengzhou University of Aeronautics,Zhengzhou 450015,China;Jianhua Construction Materials(Henan)Co.,Ltd.,Xinzheng 451192,China;Zhongyun International Engineering Co.,Ltd.,Zhengzhou 450015,China)

机构地区：[1]郑州航空工业管理学院,郑州450015 [2]建华建材(河南)有限公司,新郑451192 [3]中赟国际工程有限公司,郑州450015

出　　处：《工程地质学报》2025年第1期367-376,共10页Journal of Engineering Geology

基　　金：国家自然科学基金项目(资助号:41902266);中国博士后科学基金项目(资助号:2022M721046);河南省科技攻关项目(资助号:222102320137);河南省高等学校重点科研项目(资助号:25B560003);河南省住房城乡建设科技计划项目(资助号:HNJS-K-2330);河南省研究生教育改革与质量提升工程项目(资助号:YJS2025XQC36).

摘　　要：以黄河中下游地区湿陷性黄土地基为研究对象,探究管桩沉桩过程中的挤土效应对黄土湿陷的消除作用。结果表明,挤土效应通过改变黄土物理状态发挥作用。距桩中心点距离增加,桩间土孔隙比和干密度分别呈非线性增加和减小趋势,且在3倍直径范围内变化显著。对于中等湿陷黄土场地而言,沉桩后埋深较大的黄土湿陷可全部消除,埋深较浅的黄土湿陷可全部消除或从中等降至轻微。基于圆扩张理论的解析法认为,黄土湿陷消除的桩间距设置不应超过3倍桩径,在此基础上的桩间土变形属于塑性变形。此外,原位标准贯入和静力触探检测结果间接表明,沉桩后桩间土和单桩承载力均显著提高,这为黄河中下游地区中等湿陷黄土的地基处理提供了理论和数据支撑。Taking the moderately collapsible loess foundation in the middle and lower reaches of the Yellow River as the research object,we aim to explore the elimination effect of loess collapsibility during the process of pipe pile driving.The results show that the compaction effect plays a role in changing the physical and mechanical parameters of loess.With the increase in distance from the center point of the pile,the void ratio and dry density of the soil between the piles show a nonlinear increase and decrease trend,respectively,and change significantly within the range of 3 times the diameter.For medium collapsible loess,the collapsibility of loess with a larger burial depth has been completely eliminated,and the collapsibility of loess with shallow burial depth has been completely eliminated or reduced from moderate to slight.Based on the cavity expansion theory,the distance between piles to eliminate collapsibility of loess should not exceed 3 times the diameter,and soil plastic deformation may occur.Further combining the results of in-situ standard penetration and cone penetration tests,it is believed that the bearing capacity of the soil between the piles and single pile has been significantly improved.This provides theoretical and data support for the foundation treatment of collapsible loess in the middle and lower reaches of the Yellow River.

关 键 词：管桩 挤土效应 黄土 湿陷性 承载力 

分 类 号：TU43[建筑科学—岩土工程]