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林培忠 ，刘   桢 ， 陈   昊

 

（河南省自然资源监测和国土整治院 ，郑州 450016)

摘   要 ：为研究不同影响因素下加筋碎石桩复合地基承载力学性能特征 ，考虑群桩效应 ，采用 FLAC 3D 软件建立了加筋碎石桩复合地基承载力计算数值模拟模型 ，对不同桩径 、桩距与桩径比值 、加筋体刚度 、桩体模量以及垫层厚度 5 种因素条件下复合地基沉降以及桩体变形随竖向荷载的变化规律展开了数值模拟分析。结果表明： 随着加筋碎石桩桩距与桩径比值 、加筋体刚度以及垫层厚度的增加 ，加筋碎石桩复合地基最大沉降均呈指数衰减式减小 ；为提高加筋碎石桩复合地基的承载能力 ，加筋碎石桩的桩距与桩径比值不能超过 5 ,  加筋体的整体刚度宜为 2 000 kN/m 左右 ，垫层的厚度不能超过 0. 5 m； 随着桩径的减小 ，加筋碎石桩复合地基沉降会呈现线性减小的趋势 ，但工程造价增加 ，在实际工程设计中 ，应根据使用要求和经济水平来选择加筋碎石桩的桩径大小。

关键词：加筋碎石桩 ；FLAC 3D ；桩距与桩径比值 ；加筋体刚度 ；垫层厚度

中图分类号：TU47           

文献标志码：A            

文章编号： 1005- 8249   (2025)  05- 0103- 07

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .05 .019

 

LIN Peizhong ,  LIU Zhen ,  CHEN Hao

（Institute of Natural Resources Monitoring and Comprehensive Land Improvement ofHenan Province ,  Zhengzhou 450016 ,  China)

Abstract :  In order to  study  the  bearing  mechanical  properties  of  reinforced  gravel pile  composite foundation under  different influencing factors , a  numerical  simulation  model  for  calculating  the  bearing  capacity  of  reinforced  gravel  pile composite foundation was  established  by FLAC  3D software .  The  numerical  simulation  analysis  was carried  out  on  the settlement  of composite foundation and the variation of pile deformation with vertical load under the conditions of different pile diameter ,  ratio of pile spacing to pile diameter ,  reinforcement stiffness ,  pile modulus and cushion thickness . The  results show that :  With the increase of the ratio of pile spacing to pile diameter ,  the stiffness of the reinforced body and the thickness of the cushion ,  the maximum settlement of reinforced  gravel  pile  composite  foundation  decreases  exponentially.  In  order  to  improve  the  bearing capacity of reinforced gravel pile composite foundation ,  the ratio of pile spacing to pile diameter of reinforced gravel pile should not exceed 5 ,  the overall stiffness of the reinforced body should be about 2000 kN/m ,  and the thickness of the cushion should not exceed 0. 5  m. With the  decrease of the pile  diameter ,  the settlement of the reinforced gravel pile  composite foundation will show a linear decreasing trend . However , increase  of the  project  cost , in  the  actual  engineering  design ,  the pile  diameter of the reinforced gravel pile should be selected according to the use requirements and economic level.

Key words :  reinforced gravel pile;  FLAC 3D;  ratio of pile spacing to pile diameter; stiffness of the reinforced body;  cushion thickness

基金项目： 国家自然科学基金项目  (52374087) 。

作者简介：林培忠  (1973—) ,  男 ，本科 ，高级工程师 ，主要研究方向： 土地资源管理与地质工程。

收稿日期：2024 - 03 - 26