湿陷性黄土地区多桩型挤密桩复合地基加固效果对比研究  

Comparative study on reinforcement effect of compact pile composite foundation with multiple pile types in collapsible loess area

作　　者：李云瑜 贾世平 苏天涛 LI Yun-yu;JIA Shi-ping;SU Tian-tao(Gansu Third Construction Group Co.Ltd.,Lanzhou730030,China;School of Civil Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China)

机构地区：[1]甘肃第三建设集团有限公司,甘肃兰州730030 [2]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2024年第5期147-152,共6页Journal of Lanzhou University of Technology

基　　金：甘肃省住房和城乡建设厅建设科技项目(JK2023-08)。

摘　　要：依托兰州新区某地基处理项目,通过大量试验分别测试素土挤密桩、SDDC挤密桩以及两种挤密桩组合等不同桩型挤密桩复合地基的承载力、桩身土压实系数、桩间土挤密系数和黄土湿陷性,对三种挤密桩复合地基在湿陷性黄土地区中的加固效果进行对比研究.结果表明:三种桩型的挤密桩均能有效提高地基承载力并改善黄土湿陷性;素土挤密桩对地基承载力的提升能力有限,且桩间土挤密程度受回填素土粒径的影响较大,挤密的均匀程度较差;SDDC挤密桩对地基承载力的提升效果和沉降控制效果优于素土挤密桩,但对桩间土的挤密效果较差.Based on a project in Lanzhou New District,this paper conducted a comparative study on the strengthening effect of compacted pile composite foundation with different pile types,such as plain soil compacted pile,SDDC compacted pile,and two kinds of compacted pile combination in collapsible loess area through a large number of tests to evaluate the bearing capacity of compacted pile composite foundation,the compaction coefficient of pile body soil,the compaction coefficient of soil between piles,and the collapsibility of loess.The results show that all three pile types of compacted piles can effectively improve the bearing capacity of the foundation and improve the collapsibility of loess.Plain soil compaction pile has limited ability to improve the bearing capacity of the foundation,with the soil compaction degree between piles greatly affected by the particle size of backfill soil,resulting in uneven densification.SDDC compaction pile has a better effect on improving foundation bearing capacity and settlement control than plain soil compaction pile.

关 键 词：湿陷性黄土 复合地基 地基处理 SDDC挤密桩 素土挤密桩 

分 类 号：TU475.3[建筑科学—结构工程]