石灰桩融化岛状多年冻土的试验研究

Experimental Study on the Lime Pile Thawing Island Permafrost

针对岛状多年冻土区的新建工程和既有工程改扩建过程中面临的地基多年冻土稳定性问题,利用生石灰与水反应放热原理,采用预融技术对多年冻土地基进行处理,达到使冻土融化并固结沉降从而增强地基承载力的效果。在收集国内外工程中处理岛状多年冻土的主要方法和生石灰桩在处理地基的应用范围等相关资料的基础上,创新性开展石灰桩预融冻土地基室内模型试验研究,通过试验确定适用于融化高温岛状冻土且增强其地基承载力的石灰桩材料类型、材料配合比及施工工艺,并对其应用效果进行评价,形成在高温岛状冻土地区可以应用的一种新型成套石灰桩预融技术。

Aiming at the problems of new existing constructions foundation stability during the expansion project in island permafrost area,prethawing technique is employed based on exothermic effect generated by the reaction of quicklime with water to melt the permafrost and consolidate settlement to enhance the bearing capacity of the foundation soil. The paper,on the basis of collecting home and abroad methods of dealing with island permafrost engineering and the effect of lime pile in the treatment of foundation,conducts the study on indoor model tests of lime pile prethawing permafrost and identifies the materials,mixing ratio and construction techniques suitable for the lime pile in melting high temperature island permafrost and enhance foundation bearing capacity. The effect of its application is assessed to come up with a complete set of lime pile prethawing techniques.