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《Journal of Railway Science and Engineering》 2009-03
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Behavior of the sand well composite foundation by indoor model test

ZOU Xin-jun,YANG Mei,ZHAO Ming-hua(College of Civil Engineering,Hunan University,Changsha 410082,China)  
To study the behavior of sand well composite foundation,the test device was first designed and a group of indoor sand well composite foundation model testing was then completed with some useful data obtained which including load,displacement and stress.Based on these obtained test data and the relevant research methods used in granular material pile composite foundations,the load-settlement curve and the stress ratio curve changing along with the exerted load at the well top of sand well composite foundations were discussed.The changing rules of these curves show that,sand well can significantly improve the bearing capacity and decrease the settlement of soft subsoil.However,the "pile group effect" is also found,which means decreasing of the bearing capacity and increasing of the settlement of composite foundation if more sand wells are included under the bearing plate during the loading test.Therefore,appropriate well spacing should be selected in engineering practice.Moreover,proper discount is also advised when the bearing capacity of the sand well composite foundation is estimated by loading test result of single-pile composite foundation.
【Fund】: 湖南省自然科学基金资助项目(07JJ4015);; 国家“863”计划项目(2006AA11Z104)
【CateGory Index】: U213.1;U416.1
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