Model Tests Research on Extruding Soil Caused by Close-Mouth Step Cross-Section Pipe Pile

Abstract:

To study extruding soil caused of close-mouth step cross-section pipe Pile, model experimentals of five static piling tests with two constant cross-section pipe piles and three step cross-scetion pipe piles are performed in lab respectively and some observation points are installed for heave amount and horizontal displacement of soil surface around piles before tests.Results show that penetration resistance improved linearly with increasing of length of pile in soil and there has a turning point which become more and more obviously with increasing of average diameter of step cross-section pipe pile after the pile length in soil is 70cm.Comparing with uniform cross-section pipe pile, penetration resistance per unit volume is more bigger and increases with improving of variable cross-section ratio to step cross-section pipe pile.The swelling-up amount of soil around step cross-section pipe pile increases firstly, then decreases secondly ,and increases finally. Camparing with uniform cross-section pipe pile, the maximum heaves have 51.0% and 44.6% reduce respectively to setp cross-section pipe pile and the position of largest heaves moved from 1.0d to 1.5d.Moreover, the largest horizontal displacements have 24.6% and 26.9% reduce respectively to step cros-section pipe pile and the point of largest horizontal displacement moved from 2.0d to 2.5d.

• Periodical: Applied Mechanics and Materials (Volumes 744-746)
• Pages: 531-535
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.744-746.531
• Online since: March 2015
• Authors: Qing Guang Yang*, Jie Tian, Jie Liu, Ya Hui Wang
• Keywords: Compaction Effect, Model Tests, Penetration Resistance, Step Cross-Section Pipe Pile

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