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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 of a construction project in Hutubi, Xinjiang, the construction site is a non-self-weight collapsible loess site, and the grade of subgrade collapse is Grade II (medium) -III (severe), with 6000kN.m high energy dynamic compaction Collapsible loess foundation. Through the indoor geotechnical test and the in situ load test before and after dynamic compaction, the change of dry density, void ratio, collapsibility coefficient and initial pressure of the loess before and after treatment were analyzed. Combining with the analysis of the mechanism of loess microstructure collapse, It is clarified that when the soil moisture is low, the high dynamic compaction method can still effectively increase the bearing capacity and basically eliminate or significantly reduce the collapsibility of the loess, providing practical engineering experience for engineering construction in the loess area.