基于数值模拟的桩网复合地基加固效果对比分析  

Comparative analysis of reinforcement effect of pile-net composite foundation based on numerical simulation

作　　者：王瑞芳[1] 李闯 WANG Ruifang;LI Chuang(College of Urban Construction,Wuhan University of Science and Technology,Wuhan430065,China)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065

出　　处：《四川建筑科学研究》2024年第6期85-90,114,共7页Sichuan Building Science

基　　金：国家自然科学基金面上项目(51778508)。

摘　　要：利用有限元分析软件ABAQUS建立了二维桩网复合地基模型,分析了预应力高强度混凝土(prestressed high-strength concrete,简称PHC)桩网复合地基、桩承式复合地基、PHC桩砂桩复合地基这3种复合地基加固方式,在路堤荷载下的变形、受力特性。数值计算结果表明:桩承式复合地基的路面沉降最小,PHC桩网复合地基其次,PHC桩砂桩复合地基最大;桩承式复合地基的桩土应力比、桩体荷载分担比最大,土拱效应最明显。计算分析数据说明,针对复杂的、软土较深厚的高速公路、铁路的路基,可采用桩承式复合地基加固,加固效果更好。Finite element analysis software ABAQUS was used to establish a two-dimensional pile-net composite foundation model,and the deformation and stress characteristics of PHC pile-net composite foundation,pile-cap-net composite foundation,PHC sand pile composite foundation under embankment load were analyzed.The numerical calculation results show that the settlement of pile-cap-net composite foundation is the smallest,followed by PHC pile-net composite foundation,and the settlement of PHC sand pile composite foundation is the largest.The pile-cap-net composite foundation has the largest pile-soil stress ratio and load sharing ratio,and the most obvious soil arching effect.The calculation analysis data show that the pile-cap-net composite foundation can be used to strengthen the roadbed of highway and railway in complex and deep soft soil,and the reinforcement effect is better.

关 键 词：桩网复合地基 加固效果 荷载传递规律 变形 土拱效应 

分 类 号：TU473.1[建筑科学—结构工程]