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.

doi:10.16186/j.cnki.1673-9787.2025010003

Received:2025/01/03

Revised:2025/04/21

Published: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