深层搅拌法加固软粘土技术

深层搅拌法是用水泥作为固化剂,通过特制的深层搅拌机械,在地基深部就地将软粘土与固化剂强制拌和,使软粘土硬结而提高地基强度。这种新的地基加固方法适用于加固软粘土特别是超软土。本文介绍该技术的主要内容:①室内试验研究;②深层搅拌机械的研制;③深层搅拌法加固软粘土地基的现场试验和工程应用。该加固方法经技术鉴定认为:所研制的SJB-1型深层搅拌机、相应的搅拌工艺及专用固化剂配方等已基本形成一套适合我国条件的陆上深层搅拌技术,为我国软土地基加固技术增添了一种新方法,今后可在软土地基加固工程中逐步推广应用。

A New Technique of Reinforcing Soft Cohesive Ground by Deep Mixing Method

The technique of deep mixing method is used to reinforcing soft cohesive ground,in which cement is used as a consolidating agent and a special deep mixing machine is utilized. The purpose of this technique is to increase the strength of the soil in a considerable depth by injecting cement slurry and by mixing of the cement slurry with the soil. Compared with the untreated soil,soil consolidated by this method has a compressive strength 40-100 times higher.This method is suitable for reinforcing the soft cohesive ground,particularly the very soft clay.This paper introduces cardinal parts of the aforesaid technique: ①laboratory studies, ②research for deep mixing machine, ③in-situ experiments and applications of this technique to foundation engineering.Technical appraisement concluded that the dispansation of the consolidation agent, the deep mixing machine SJB-1,and the associated technology of the job basically have formed a system of deep mixing method on land suitable to our country. It offers a new method in the field of cohesive ground reinforcement,and will extend with a wider application in soft cohesive ground inprovement progressively.