Geometrical Effect of Under-reamed Pile in Clay under Compression Load Numerical-Study  

作　　者：Ahmed MNasr Waseim RAzzam Ibrahim S.Harran 

机构地区：[1]Faculty of Engineering,Tanta University,Tanta,002040,Egypt

出　　处：《Advances in Geological and Geotechnical Engineering Research》2023年第1期1-9,共9页地质与岩土工程研究进展（英文）

摘　　要：Recently,the use of deep foundations has increased as a result of the expansion in the construction of high-rise buildings,train tracks,and port berths.As a result of this expansion,it was necessary to use deep foundations that have low cost,high bearing loads,low settlement,and construction time,and such foundations are subjected to different types of loads such as lateral,vertical compression,and tension loads.This research paper will present one of the most important types of deep foundations that are aptly used in such structures and the most important factors affecting their bearing capacity and settlement in stiff clay.This type of deep foundation is called an under-reamed pile.The factors used in this study are pile length to diameter ratio L/D=30,bulb diameter ratio(Du/D=1.5,2,2.25,and 2.5),number of bulbs(N=1,2,and 3),and spacing ratio(S/D=2 to 8).To investigate the effects of these parameters and obtain optimal results,the PLAXIS 3D was used.The analysis shows that the increase in bulb diameter increases the bearing load by 43%.Bulb spacing controls the failure mechanisms,whether cylindrical shear failure or individual failure and increases the capacity by 66%and 99%,respectively,for two and three bulbs when the bulb spacing becomes S/D=8.When the number of bulbs increases to three,the capacity increases by 90%.If each bulb works individually,the bearing capacity doubles.

关 键 词：Under-reamed pile Bulb number Bulb diameter Bulb spacing Bearing capacity 

分 类 号：TU4[建筑科学—土工工程]