置换式水泥土桩长期强度特性试验研究  

Experimental study on the long-term strength properties of replaced cement soil pile

作　　者：曹净[1] 孙成蛟 

机构地区：[1]昆明理工大学建筑工程学院,昆明650500

出　　处：《工程勘察》2018年第2期8-11,共4页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金(51568030)

摘　　要：置换式水泥土桩以独特的优越性在软土地区得以广泛应用,强度特性是水泥土复合体最为重要的力学特性,其中长期强度在工程中须加以重视。本文选用昆明地区的冲洪积黏性土作为水泥土试验原材料,通过室内试验对其长期强度性能进行了试验研究。基于水泥土复合体的无侧限抗压强度试验,得到标准养护下水泥土复合体强度—龄期—水泥掺入比三者的相关关系。研究结果表明:随着水泥掺入比的增加,水泥土复合体无侧限抗压强度明显增大;伴随水土作用和淋溶作用,水泥土复合体强度随龄期的增长呈现出先增长后降低的趋势;并总结得出了由初期强度推算中、后期强度的经验公式。The replaced cement soil pile is widely used in soft soil area. The strength characteristics are the most important mechanical properties of cement-soil composites, and the long-term strength should be taken into account in practice. The alluvial soil in the Kunming area is selected as the raw material of cement soil test, and its long-term strength performance is studied by laboratory test. Based on the unconfined compressive strength test of cement-soil composites, the relationship between the cement-soil composites strength and age, incorporation ratio with standard curing was obtained. The results show that the compressive strength of cement-soil composites increases with the increase of the cement incorporation ratio; and the strength of cement-soil composites first increases and then decreases with age, accompanied by soil-water interaction and leaching action. Then the empirical formula of the medium and late strength is deduced from the previous strength.

关 键 词：置换式水泥土桩 掺入比 龄期 水土作用 长期强度 

分 类 号：TU473.11[建筑科学—结构工程]