15008

13507

كارشناسي ارشد

ژئوتكنيك

اصفهان : دانشگاه صنعتي اصفهان

1398

پانزده، 101ص. : مصور، جدول

محمد علي روشن ضمير

مهدي حجازي

رسول اجل لوئيان، حميد هاشم الحسيني

1398/06/13

كتابنامه

عمران

مهندسي عمران

1398/06/13

2555495

015 An investigation on the performance of braid encased stone columns Hossein Nosouhi Date of Submission June 25 2019 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Dr Mohammad Ali RowshanzamirSupervisor Dr Mahdi HejaziAbstractThrough different methods which are available for soft soil improvement today stonecolumns are one of the most frequently used methods due to their low cost effectivenessand ease of installation In this method usually fifteen to thirty five percent of weak soilvolume is replaced by stone materials through opening up a vertical cylindrical hole in thesoft clay bed and susiquently filling it up with compacted crushed or gravel In order toincrease the bearing capacity of sone columns is soft caly the idea of reinforcing the stonecolumns with geosynthetics have been proposed In this study the performance of braid encased stone columns have been investigated Themost different between braid and another kind of geosynthetics is cylindrical shape ofbraid that can make full encasement for stone columns In this study the performance ofbraid encased stone columns and palanar geosynthetic encased stone columns has beencomparised Due to comparing the result of loading tests a better performance of braidencased stone columns has been proved The performance of braid encased stone columnswill increase in higher amounts of loading Then in the following the effect of diameter height to diameter ratio hardness ofincasement materials and also the length of the incasment materials has been investigatedfor braid encased stone columns Stone columns performance improves with increase indiameter and height to diameter ratio due to replacement if soft soil with more hardcrushed stones Also by examination of the time the longer time interval betweeninstallation loading leads to more bearing capacity This increase in bearing capacity is dueto drainage of water by stone columns material which increase the undrained shear strengthof soft caly Finally a number of tests has been performed on the group of stone columns and acomparison has made between the performance of the braid encase stone columns and theplanar geosynthetic encased stone columns Key WordsBearing Capacity Stone column Braid Geosynthetic Clay bed

محمد علي روشن ضمير

مهدي حجازي

رسول اجل لوئيان، حميد هاشم الحسيني