Experimental study on soil improvement with stone columns and granular blankets  

石柱与颗粒覆盖增强土壤的实验研究（英文）

作　　者：Nima MEHRANNIA Farzin KALANTARY Navid GANJIAN 

机构地区：[1]Department of Civil Engineering, Tehran Science and Research Branch, Islamic Azad University [2]Department of Civil Engineering, K.N.Toosi University of Technology

出　　处：《Journal of Central South University》2018年第4期866-878,共13页中南大学学报（英文版）

摘　　要：Stone column is one of the soil stabilizing methods that is used to increase bearing capacity and decrease the settlement of soft soils.Reinforced and unreinforced granular blankets are now being utilized to overcome the problems of soft soils.In this research,the bearing capacity of stone columns,granular blanket,and a combination of both methods in reinforced and unreinforced modes were studied using scaled physical models.Results show that using granular blanket,stone column,and combination of both improves bearing capacity of soft soils.Using geogrid as the reinforcement of granular blankets and geotextile as stone-column encasement increases the efficiency of granular blankets and stone columns significantly.Additionally,in the case of using geotextile around the stone column,the stress concentration ratio of the stone column will increase as well as its rigidity and bearing capacity.石柱是稳定土壤的方法之一,用以增加承载能力和减少软土的沉降。增强和非增强颗粒覆盖现在也被用以解决软土问题。本文采用缩小物理模型,研究石柱、颗粒覆盖和两者组合在增强和非增强的模式下对土壤承载能力的影响。结果表明,采用颗粒覆盖、石柱或两者组合可提高软土的承载能力。利用土工格栅对颗粒覆盖进行增强以及利用土工布包裹石柱可显著提高颗粒覆盖和石柱的效率。此外,采用土工布包裹石柱,石柱的应力集中比,刚性和承载能力都得到提高。

关 键 词：stone column bearing capacity GEOGRID GEOTEXTILE granular blanket soil improvement 

分 类 号：TU472[建筑科学—结构工程]