石灰桩融化岛状多年冻土的试验研究

发布时间：2018-03-06 02:25

本文选题：石灰桩　切入点：岛状冻土　出处：《铁道标准设计》2017年12期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In view of the stability of permafrost foundation in the process of reconstruction and extension of existing projects in the island permafrost region, the permafrost foundation is treated by prethawing technology by using the heat release principle of reaction of quicklime and water. On the basis of collecting the main methods of treating the island permafrost and the application range of quicklime pile in the treatment of the foundation, the bearing capacity of the foundation can be enhanced by thawing the frozen soil and consolidating the settlement of the frozen soil, so as to enhance the bearing capacity of the foundation. The indoor model test of lime pile pre-thawing frozen soil foundation is carried out innovatively. Through the experiment, the type of lime pile material, the material mix ratio and the construction technology are determined, which are suitable for thawing high temperature island frozen soil and strengthening its foundation bearing capacity. The application effect is evaluated to form a new type of lime pile pre-thawing technology which can be used in the high temperature island frozen soil area.
【作者单位】：中铁西北科学研究院有限公司;青海省冻土与环境工程重点实验室;中铁二院工程集团有限责任公司;兰州交通大学土木工程学院;
【基金】：国家自然科学基金项目(51278425,51178400) 中国铁路总公司科技研发课题(2014G004-H) 中国中铁股份有限公司科技开发计划(2016-重大-01) 中铁科研院科技开发计划项目(石灰桩预融技术在岛状多年冻土区的应用研究) 中铁二院科研项目(2015-中俄-6)
【分类号】：TU445

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