邵广彪,付唐国,蒋天琪,等.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[J].河南理工大学学报(自然科学版)，doi:10.16186/j.cnki.1673-9787.2025010003.

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) ，doi: 10.16186/j.cnki.1673-9787. 2025010003.

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(网络首发)

邵广彪^1,3，付唐国¹，蒋天琪²，陈琳琳⁴，刘曰伟⁴

1 山东建筑大学 土木工程学院，济南 250101；2 山东鼎兴基础工程股份有限公司，济宁 272000；3 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，济南 250101；4 山东建筑大学工程鉴定加固研究院有限公司，济南 250013

摘要: 目的 为了解决黄河下游冲积地层沉积时间短、敏感性高等特性所导致的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。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 m和19 m两组试验桩各三根，其持力层分别为粉质黏土和粉土，每组均包含复式后注桩、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 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，对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，具有较好的适用性和经济性，且复式后注浆各方面效果均优于桩端后注浆。本文复式后注浆对于PHC管桩端阻和侧阻的提升比率均不低于规范中灌注桩后注浆增强系数，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：2025-03-04

网络首发日期：2025-10-14

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

SHAO Guangbiao^1,3，FU Tangguo¹，JIANG Tianqi²，CHEN Linlin⁴，LIU Yuewei⁴

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

Abstract: Objectives In order to solve the problems of poor soil squeezing effect and low side resistance of PHC pipe pile caused by short deposition time and high sensitivity of alluvial strata in the lower reaches of the Yellow River, the experimental study on the compressive bearing capacity of PHC pipe pile after grouting under this stratum condition was carried out. Methods The post-grouting method and the length of the test pile were selected as variables, and the in-situ test was carried out based on a project under construction. The post-grouting methods of the test design are pile end post-grouting and pile end pile side compound post-grouting, and a non-grouting control group is set. The construction piles are 15 m and 19 m in length, three test piles in each group. The bearing layers are silty clay and silty soil, respectively. Each group includes composite post-grouting pile, post-grouting pile at pile end and non-grouting pile. The strain sensor is pasted on the pile body of the test pile, and the reaction force meter is installed at the pile end. Combined with the static load test, the variation law of the pile body is explored.

Results The ultimate bearing capacity of the composite post-grouting test piles increased by 77% (15 m ) and 55% (19 m ) respectively, and the ultimate bearing capacity of the post-grouting test piles increased by 26% (15 m ) and 19%(19 m ) respectively. After the compound post-grouting, the lateral resistance of the silt layer is increased by 96%, the lateral resistance of the silty clay layer is increased by 64%, and the relative displacement of the pile-soil required for the lateral resistance of the lower soil to reach the limit is increased from 5~7 mm to 15~20 mm. When the silt is used as the bearing layer, the effect of improving the end resistance is better than that of the silty clay. The end resistance of the composite post-grouting pile type is increased by 1.84 times, and the end resistance of the post-grouting pile type is increased by 1.52 times. Conclusions The post-grouting technology of PHC pipe pile is suitable for alluvial strata in the lower reaches of the Yellow River. It can effectively improve the compressive bearing capacity of PHC pipe pile, improve the stability of pile body, and enhance the elastic-plastic deformation characteristics of pile-soil system. In this paper, compound post-grouting boosts PHC pipe piles' end and side resistance ratios, not lower than those of post-grouted cast-in-place piles in the code. So, it can directly guide engineering practice.

Key words: alluvial strata in the lower Yellow River; PHC pipe pile; pile end post grouting; pile end pile side compound post grouting; in-situ test; compressive bearing characteristic