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《Engineering Blasting》 2017-05
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Numerical calculation of the barrier effect of the pre-protective layer on bored piles in deep foundation pit blasting

JIA Yong-sheng;ZHONG Dong-wang;YAO Ying-kang;SI Jian-feng;HAN Chuan-wei;HUANG Xiao-wu;Wuhan Explosion & Blasting Co.,Ltd.;College of Science,Wuhan University of Science and Technology;  
In excavation engineering of foundation pit,the excavation part of blasting excavation is usually reserved for a certain thickness of rock layer to protect the safety of the surrounding structure of the foundation pit to avoid the great energy caused by blasting.It is not only to ensure the safety of foundation pit excavation process,but also to reduce the construction period and improve the economic benefit.The protection effect of the adjacent bored piles is analyzed by using LS-DYNA finite element analysis software.The analysis results showed that the protective layer of the weathered stone of 1.5 mthick,as adjacent bored piles,can significantly reduce the pressure peak and maximum principal stress peak of bored piles under explosive load,and protect adjacent bored piles from destruction.At the same time,the last of the holes in the drilled pile has a 25 ms deferring to prevent the stacking of the stress peaks,which will further protect the safety of the drilled pile.The conclusion can be used as a reference.
【Fund】: 国家自然科学基金资助项目(51174147;51574184)
【CateGory Index】: TU753
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