高液限土路基的改良设计及施工技术研究

Research on Improvement Design and Construction Technology of High Liquid Limit Soil Subgrade

西双版纳国际旅游度假区B地块市政配套工程中,地勘显示建设场地的工程地质以高液限粉质黏土为主,原状土的地基承载力很高,但一旦开挖裸露遇水后迅速成泥状,承载力急剧下降,对路基稳定十分不利,通过掺水泥改良路基土,可以基本达到对下卧高液限土的隔水作用,满足作为路基填土的要求,同时提出高液限粉质黏土的施工工艺及施工注意事项,为其他类似高液限土路基设计及施工提供了借鉴价值。

In the municipal supporting project of Block B of Xishuangbanna International Tourism Resort,the geological survey shows that the engineering geology of the construction site is dominated by high liquid limit silty clay. The foundation bearing capacity of the original soil is very high. But once excavated,it quickly becomes muddy when exposed to water, and the foundation bearing capacity rapidly decreases,which is very unfavorable to the stability of the subgrade. The mixing of cement to improve the subgrade soil can basically achieve the water-proof effect of the underlying high liquid limit soil and meet the requirements of subgrade filling. Meanwhile the construction technology and cautions of high liquid limit silty clay are put forward, which provide the reference for the design and construction of the other similar high liquid limit soil subgrade.