中南大学学报（自然科学版）2026，Vol.57Issue(2)：831-844,14.DOI:10.11817/j.issn.1672-7207.2026.02.027
深厚回填土中大直径嵌岩桩承载特性研究
Study on bearing characteristics of large-diameter rock-socketed pile in deep backfill soil
摘要
Abstract
To explore the bearing characteristics of large-diameter rock-socketed piles under deep backfill conditions in reclamation projects,field static load tests and finite element simulations were conducted on three rock-socketed cast-in-place piles with 800 mm diameter from a Qingdao reclamation project to reveal the bearing behavior and load transfer mechanisms of these piles in deep backfill soils.The results show that the load-displacement curves of the test piles are of slow type before estimated ultimate bearing capacity(16.0 MN),exhibiting a nonlinear relationship between load and displacement.Pile axial force attenuates gradually along the pile depth,with its attenuation rate governed by soil layer properties.In the deep backfill layer,the attenuation rate is approximately 0.075 MN·m-1,while in strongly weathered argillaceous silty sand layer,it ranges from 0.7-1.3 MN·m-1.The pile side friction resistance increases moderately in overlying soil layers but rises significantly within the strongly weathered rock layer.The test piles exhibit the friction end-bearing piles.The pile tip resistance accounts for 58.2%-62.5%of the total load,and the pile tip resistance plays a major bearing role.The pile side friction resistance of moderately weathered argillaceous siltstone obtained by finite element simulation exhibits a multi-peak distribution and demonstrates resistance enhancement adjacent to the pile tip.关键词
深厚回填土/嵌岩桩/承载特性/桩身轴力/桩端阻力/桩侧摩阻力Key words
deep backfill soil/rock-socketed pile/static load test/pile axial force/pile tip resistance/pile side friction resistance分类
建筑与水利引用本文复制引用
秦志超,白晓宇,闫楠,赵香梅,孙林娜,张亚妹..深厚回填土中大直径嵌岩桩承载特性研究[J].中南大学学报（自然科学版）,2026,57(2):831-844,14.基金项目
国家自然科学基金资助项目(52478348) （52478348）
山东省自然科学基金资助项目(ZR2024ME224,ZR2023QE107) （ZR2024ME224,ZR2023QE107）
山东省泰山学者项目(tsqn202306234)(Project(52478348)supported by the National Natural Science Foundation of China （tsqn202306234）
Projects(ZR2024ME224,ZR2023QE107)supported by the Key Project of Natural Science Foundation of Shandong Province （ZR2024ME224,ZR2023QE107）
Project(tsqn202306234)supported by Taishan Scholars Program of Shandong Province) （tsqn202306234）
