珠三角地区现场水泥土的力学性质  

Mechanical Properties of Field Soil-Cement in the Delta of the Pearl River

作　　者：曾庆军[1] 莫海鸿[1] 廖建春[2] 黄腾 

机构地区：[1]华南理工大学建筑学院,广东广州510640 [2]广东省公路勘察规划设计院,广东广州510507 [3]广东省航盛工程有限公司,广东广州511442

出　　处：《华南理工大学学报（自然科学版）》2006年第7期115-119,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：广东省交通厅科技资助项目(2002-05)

摘　　要：研究珠三角地区淤泥、淤泥质粘土形成的水泥土的力学性质可为水泥土搅拌桩的设计和施工提供直接依据．文中在1天龄期内钻探取出现场的桩身水泥土制作成试样，养护到不同龄期，测定其物理性质指标以及无侧限抗压强度、剪切强度、压缩模量等力学性质指标，得到了现场水泥土强度的增长规律及影响因素，获得以下结论：现场水泥土强度随龄期明显增长，28天龄期无侧限抗压强度约为室内水泥土配合比试验强度的一半；原状土为淤泥的现场水泥土的28～90天龄期压缩系数为0．1～0．4MPa^-1，具中等压缩性；90天龄期现场水泥土的无侧限抗压强度为0．4～1．1MPa，比原状土增加了19．9～56．6倍．The investigation into the mechanical properties of field soil-cement mixed with silt or mucky soil can directly provide useful data for the design and construction of soil-cement mixing piles in the Delta of the Pearl River. In this paper, the field soil-cement with one-day age was drilled and sampled. The samples were then cured for different ages, followed by the measurements of the physical and mechanical properties, including the unconfined compression strength, the shear strength and the compression modulus. Therefore, the growth laws and influencing factors of the strength of field soil-cement were obtained, thus coming to the conclusion that the unconfined compression strength of the field soil-cement obviously increases with the age to about half of that of the soil-cement prepared in laboratory at the age of 28 days, that the compressive coefficient of the field soil-cement mixed with silt reaches a medium degree at the age of 28 to 90 days, namely, 0.1 to 0.4 MPa^-1, and that the unconfined compression strength of the field soil-cement is 0.4 to 1.1 MPa at the age of 90 days, which is 20.9 to 57.6 times that of the undisturbed soil.

关 键 词：淤泥 现场水泥土 龄期 力学性质 

分 类 号：TU472.3[建筑科学—结构工程]