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SHAO G B, FU T G, JIANG T Q,et al.In-situ test study on compressive bearing capacity of PHC pipe pile post grouting in alluvial strata of the lower Yellow River[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(4):1-10.

黄河下游冲积地层PHC管桩后注浆抗压承载性能原位试验研究

邵广彪1,2, 付唐国1, 蒋天琪3, 陈琳琳4, 刘曰伟4

1.山东建筑大学 土木工程学院，山东 济南  250101;2.山东建筑大学 建筑结构加固改造与地下空间工程教育部重点实验室，山东 济南 250101;3.山东鼎兴基础工程股份有限公司，山东 济宁  272000;4.山东建筑大学工程鉴定加固研究院有限公司，山东 济南  250013

摘要: 目的 为解决黄河下游冲积地层沉积时间短、敏感性高等特性导致的PHC管桩挤土效应差、侧阻值偏低等问题，进行该地层条件下PHC管桩后注浆抗压承载性能试验研究。  方法 选取后注浆方式和试验桩桩长作为变量，依托某在建工程开展原位试验。设计后注浆方式分别为桩端后注浆和桩端桩侧复式后注浆，并设置无注浆对照组。施工桩长15， 19 m，2组试验桩各3根，持力层分别为粉质黏土和粉土，每组均包含复式后注浆桩、桩端后注浆桩和无注浆桩。试验桩桩身粘贴应变传感器，桩端安装反力计，结合静载荷试验探究桩身受力变化规律。  结果 与对照组相比，复式后注浆试验桩极限承载力分别增大77%（15 m）和55%（19 m），桩端后注浆试验桩极限承载力分别提升26%（15 m）和19%（19 m）。经复式后注浆，粉土层侧阻值最大提升96%，粉质黏土层侧阻值最大提升64%，且下部土体侧阻发挥极限所需的桩-土相对位移由5~7 mm提升至15~20 mm；粉土作为持力层时，端阻提升效果优于粉质黏土，复式后注浆桩型端阻增强84%，桩端后注浆桩型端阻增强52%。  结论 PHC管桩后注浆技术适用于黄河下游冲积地层，可有效提高PHC管桩抗压承载力，提高桩身稳定性，增强桩土体系弹塑性变形特性，可直接用于指导工程实践。

关键词:黄河下游冲积地层;PHC管桩;桩端后注浆;桩端桩侧复式后注浆;原位试验;抗压承载特性

doi:10.16186/j.cnki.1673-9787.2025010003

基金项目:国家自然科学基金资助项目（52038006）

收稿日期:2025/01/03

修回日期:2025/04/21

出版日期:2026/06/17

In-situ test study on compressive bearing capacity of PHC pipe pile post grouting in alluvial strata of the lower Yellow River

Shao Guangbiao1,2, Fu Tangguo1, Jiang Tianqi3, Chen Linlin4, Liu Yuewei4

1.School of Civil Engineering， Shandong Jianzhu University， Jinan  250101，Shandong， China;2.Key Laboratory of Building Structure Reinforcement and Underground Space Engineering， Ministry of Education， Shandong Jianzhu University， Jinan  250101， Shandong， China;3.Shandong Dingxing Foundation Engineering Co.， Ltd.， Jining  272000 ， Shandong， China;4.Engineering Research Institute of Appraisal and Strengthening of Shandong Jianzhu University Co.，Ltd.， Jinan  250013， Shandong， China

Abstract: Objectives To solve the problems of poor soil squeezing effect and low side resistance of PHC pipe piles caused by short deposition time and high sensitivity of alluvial strata in the lower reaches of the Yellow River，an experimental study on the compressive bearing capacity of PHC pipe piles after grouting under these stratum conditions was conducted.  Methods The post-grouting method and the test pile length were selected as variables，and in-situ tests were carried out based on a project under construction. The post-grouting methods were pile-end post-grouting and combined pile-end and pile-side post-grouting，and a non-grouting control group was set.Piles of 15 m and 19 m in length were installed，with three test piles in each group. The bearing layers were silty clay and silt， respectively. Each group included a combined post-grouting pile， a pile-end post-grouting pile， and non-grouting pile. Strain gauges were attached to the test pile shafts， and load cells were installed at the pile ends. Static load tests were conducted to investigate the variation in pile resistance.  Results Compared with the control group， the ultimate bearing capacity of the combined post-grouting test piles increased by 77% （15 m） and 55% （19 m）， respectively，while that of  the pile-end post-grouting test piles increased by 26% （15 m） and 19% （19 m）. After combined post-grouting， the side resistance of the silt layer increased by 96%， and that of the silty clay layer increased by 64%. The pile-soil relative displacement required for the side resistance of the lower soil to reach the limit increased from 5~7 mm to 15~20 mm. When silt was the bearing layer， the improvement in end resistance was better than that of the silty clay： combined post-grouting increased end resistance by 84%， and pile-end post-grouting increased by 52%.  Conclusions PHC pipe pile post-grouting technology is suitable for alluvial strata in the lower reaches of the Yellow River. It can effectively improve the compressive bearing capacity of PHC pipe piles， enhance pile stability， and improve the elastoplastic deformation behavior of the pile-soil system. The results can be directly used to guide engineering practice.

Key words:alluvial strata in the lower reaches of the Yellow River;PHC pipe piles;pile-end post-grouting;combined pile-end and pile-side post grouting;in-situ test;compressive bearing characteristics