中南大学学报（自然科学版）2026，Vol.57Issue(2)：667-678,12.DOI:10.11817/j.issn.1672-7207.2026.02.015
桩基静载试验新方法及在高铁桥梁大直径PHC管桩中的应用
A new method for static load test of pile foundation and its application in large-diameter PHC pipe pile of high-speed railway bridge
摘要
Abstract
In weak soil areas,large-diameter PHC pipe piles for high-speed railway bridges exhibit high bearing capacity,which needs large test loads in vertical static load tests.However,traditional methods such as the Kentledge method,the anchor pile method,and the O-cell method each have significant limitations,such as insufficient safety,poor economic efficiency,or discrepancies between their bearing mechanisms and engineering reality.To address these shortcomings,a new method using pile group and pile cap to jointly provide reaction forces(refer to as the PGCPT method)was proposed and applied in static load tests on large-diameter PHC pipe piles for high-speed railway bridges.Based on the tests,key construction technology in the application of pipe piles was proposed,and the bearing behavior and deformation characteristics of large-diameter PHC pipe piles in typical silt and silty sand areas of the Yellow River Plain were analyzed.The results are as follows.1)The installation process of PGCPT method is simple and efficient,especially suitable for static load tests on large-diameter pipe piles in weak ground foundations,which effectively reduces costs and improves safety.2)The load-settlement curve of the test pile is"steep drop"type.Under the maximum load,the pile tip displays a penetrative failure mode with the continuous settlement over time.The allowable compressive capacity reaches 9 000 kN.3)The distribution patten of pile side resistance changes from an"inverted triangle"to a"single-peak"and then to a"double-peak"with the increase of load,exhibiting a trend similar to the distribution of blows per meter during pile driving.The maximum pile side resistance occurs in the middle silty sand layer.4)The pile side and pile tip load transfer functions are characterized by hyperbolic and bilinear models,respectively.Under the design and ultimate loads,the pile shows the characteristics of friction pile and end-bearing friction pile,respectively.The test results validate the reliability and superiority of the PGCPT method,which can provide important reference for the design and construction.关键词
静载试验/大直径PHC管桩/软弱地基/承载特性/破坏模式Key words
static load test/large-diameter PHC pipe pile/weak ground/bearing behavior/failure mode分类
建筑与水利引用本文复制引用
杨奇,刘洋,陈张俊辉,覃超,邓煜晨,冷伍明..桩基静载试验新方法及在高铁桥梁大直径PHC管桩中的应用[J].中南大学学报（自然科学版）,2026,57(2):667-678,12.基金项目
国家自然科学基金资助项目(51978672) （51978672）
中国铁路设计集团有限公司资助项目(2021A240601)(Project(51978672)supported by the National Natural Science Foundation of China （2021A240601）
Project(2021A240601)supported by the China Railway Design Corporation Group Limited) （2021A240601）
