Virtual soil pile model for vertical dynamic impedance of a floating pile in saturated soil layers - Details

Author：

Meng, Kun (Meng, Kun.) | Cui, Chun-Yi (Cui, Chun-Yi.) | Xu, Cheng-Shun (Xu, Cheng-Shun.) (Scholars：许成顺) | Liang, Zhi-Meng (Liang, Zhi-Meng.) | Yang, Gang (Yang, Gang.)

Indexed by：

EI Scopus CSCD

Abstract：

Based　on　the　Biot＇s　theory　of　wave　propagation　in　saturated　two-phase　media,　a　saturated　virtual　soil　pile　model　is　proposed　considering　the　effect　of　saturated　soil　layers　beneath　the　pile　toe.　The　analytical　solution　for　displacement　of　saturated　soil　is　also　derived　by　Novak　plane　strain　method.　Then,　the　vertical　dynamic　impedance　at　the　pile　head　is　obtained　by　adopting　the　pile-soil　compatibility　conditions　and　the　transfer　method　of　impedance　function,　which　is　proposed　to　verify　its　validity　with　existing　solutions.　Furthermore,　extensive　parametric　analyses　are　performed　to　investigate　the　effects　of　the　thickness　of　the　saturated　soil　beneath　the　pile　toe,　the　longitudinal　interlayer　of　surrounding　soil,　the　longitudinal　interlayer　of　soil　beneath　the　pile　toe　and　the　porosity　of　saturated　soil　at　the　ground　surface　or　beneath　the　pile　toe　on　the　dynamic　response　at　the　pile　head.　The　computational　results　show　that　the　resonance　frequency　of　dynamic　impedance　at　the　pile　head　derived　from　the　one-phase　virtual　soil　pile　model　could　be　underestimated　due　to　the　great　difference　of　compression　wave　velocity　between　one-phase　soil　and　saturated　soil.　When　the　saturation　of　soil　layers　beneath　the　pile　toe　is　remarkable　and　the　drainage　is　poor,　the　saturated　virtual　soil　pile　model　and　the　relevant　analytical　solution　are　more　suitable　to　analyze　the　longitudinal　vibration　characteristics　of　floating　pile.　The　longitudinal　interlayer　of　surrounding　soil　has　obvious　effects　on　the　amplitude　of　the　dynamic　impedance　at　the　pile　head.　However,　the　effect　of　longitudinal　interlayer　of　soil　beneath　the　pile　toe　on　the　dynamic　impedance　at　the　pile　head　can　be　ignored.　The　effect　of　porosity　of　saturated　surface　surrounding　soil　on　the　resonance　amplitude　of　the　dynamic　impedance　at　the　pile　head　is　obvious,　while　the　porosity　of　saturated　soil　beneath　the　pile　toe　has　significant　effects　both　on　the　resonance　amplitude　and　resonance　frequency　of　the　dynamic　impedance　at　the　pile　head.　©　2020,　Nanjing　Univ.　of　Aeronautics　an　Astronautics.　All　right　reserved.

Keyword：

Natural frequencies Strain Vibration analysis Soil structure interactions Computation theory Piles Soils Porosity Wave propagation

Author Community：

[ 1 ] [Meng, Kun]Department of Civil Engineering, Dalian Maritime University, Dalian; 116026, China
[ 2 ] [Cui, Chun-Yi]Department of Civil Engineering, Dalian Maritime University, Dalian; 116026, China
[ 3 ] [Cui, Chun-Yi]Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Beijing; 100124, China
[ 4 ] [Xu, Cheng-Shun]Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Beijing; 100124, China
[ 5 ] [Liang, Zhi-Meng]Department of Civil Engineering, Dalian Maritime University, Dalian; 116026, China
[ 6 ] [Yang, Gang]Department of Civil Engineering, Dalian Maritime University, Dalian; 116026, China

Reprint Author's Address：

[cui, chun-yi]key laboratory of urban security and disaster engineering, beijing university of technology, beijing; 100124, china;;[cui, chun-yi]department of civil engineering, dalian maritime university, dalian; 116026, china

Email：

cuichunyi@dlmu.edu.cn

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