回填土压实度对岩溶地面再次塌陷的影响研究  

Study on Influence of Backfill Soil Compactness on Recollapse of Karst Ground

作　　者：陈学军[1] 赵志永[1] 夏路路 

机构地区：[1]桂林理工大学,广西桂林541004

出　　处：《路基工程》2014年第6期74-76,81,共4页Subgrade Engineering

基　　金：国家自然科学基金(41262011);广西重点实验室研究基金(11-CX-01)

摘　　要：针对岩溶土洞回填后再次塌陷的问题,分析了土洞形成的机理及条件,并推导了土洞形成的起始条件中地下水位降幅的表达式。进行了红黏土三轴试验,得出三轴试验结果与压实度的关系;根据地面塌陷临界地下水位降幅表达式与三轴试验结果,得到地下水位降幅与回填土压实度的关系,并据此确定了土洞塌陷处回填后,避免再次出现塌陷回填土的最小压实度。In relation to recollapose of soil cave of karst after backfilling, this paper analyzed the mechanism and conditions which the soil cave＇s formation is based, and derived the expression of downrange of groundwater depth under the initial conditions herein. Through the triaxial test for red clay, the relation between the triaxial test result and the compactness was obtained; and through the expression of critical downrange of groundwater depth for ground collapse and the triaxial test result, the relation between the downrange of groundwater depth and the compactness of backfill soil obtained, based on which the minimum fill compactness to prevent recollapse after backfilling at the place where the soil cave had collapsed was confirmed.

关 键 词：岩溶土洞 形成条件 地面塌陷 地下水位降幅 填土压实度 

分 类 号：TU457[建筑科学—岩土工程]