摘要
本文结合新疆呼图壁某建设项目的工程实践,建设场地为非自重湿陷性黄土场地,地基湿陷等级为II级(中等)—III级(严重),采用6000kN.m高能量强夯处理湿陷性黄土地基。通过强夯前后的室内土工试验和现场原位载荷试验,分析了黄土的干密度、孔隙比、湿陷系数和湿陷起始压力在处理前后的变化情况,结合黄土微观结构湿陷机理分析,阐明在场地土含水量偏低时,采用高能量强夯法仍然能够有效提高承载力,基本消除或显著降低了黄土的湿陷性,为黄土地区的工程建设提供有实际意义的工程经验。
Based on the engineering practice in Hutubi of Xinjiang,where the engineering site is categorized as the non-self-weight collapsible loess and the foundation collapsible rating of the site is II（Medium） to III（Serious）,the foundation of the collapsible loess is treated by using dynamic compaction with 6000kN · m high energy.Through the laboratory soil tests and the field loading tests carried out on the site,the dry density,void ratio,coefficient of collapsibility and the initial collapse pressure before and after the treatment are analyzed.Combining with the mechanism analysis on the collapsibility of the loess microscopic structure,it is demonstrated that the dynamic compaction with high energy could effectively improve the bearing capacity and eliminate or significantly reduce the collapsibility of the loess even when the site soil moisture content is low,which provides the significant and practical experience for the engineering construction in loess areas.
出处
《工程勘察》
2013年第9期23-27,共5页
Geotechnical Investigation & Surveying
关键词
黄土
湿陷性
高能量
强夯
loess
collapsibility
high energy
dynamic compaction
