›› 2009, Vol. 30 ›› Issue (S1): 201-205.

• Numerical Analysis • Previous Articles     Next Articles

Analysis of uplift mechanism of uniform section piles in sandy soil

LIU Wen-bai 1, LIU Zi-sheng2, ZHOU Jian3   

  1. 1. Colleg [School] of Ocean Envionment and Engineering, Shanghai Maritime University, Shanghai 201036，China; 2. CCCC Shanghai Harbour Engineering Design and Research Institute Co. Ltd., Shanghai 200032, China; 3. Department of Geotechnical Engineering, Tongji University, Shanghai 200092，China
  • Received:2009-05-03 Online:2009-08-10 Published:2011-03-16

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Abstract:

The macro-mechanics phenomena of piles on uplift loading are closely related to the changes of its meso-mechanics. Piles on uplift loading are analysed with PFC2D (Particle Flow Code in 2 Dimensions) numerical simulation of meso-mechanics. PFC2D is used to simulate numerically the character of meso-mechanics on soil, to study the uplifting displacements of pile, the distribution and velocity of sand particle, the surface of rupture in soil and to compare with the results of material object tests. Not only did PFC preferably reproduce the relationship of uplift loading and displacement of pile experiment but also suitably simulate pile、s gradually progressive failure pattern. The changes in the meso-syructure and the forming process on the shear zone of soil body have been analyzed. The cause of forming uplift pile shear zone is strain softening effect of the dense sand. Particle contact force of PFC2D numerical simulation and pile side frictional resistance of physical tests are identical. The load-displacement curves are consistent with the results of numerical simulation and physical tests. It is closely related to pile side frictional resistance, the forming process of shear zone, the load-displacement and particles distribution, particles speed, particle contact force of PFC2D numerical simulation. Changes of soil particle meso-structure and displacement of piles of PFC2D numerical simulation are initial study of meso-mechanics character and macro-mechanics response.

Key words: pile, uplift loading, Particle Flow Code, meso-mechanics, numerical simulation, progressive gradually failure, shear band

CLC Number: 

  • TU473
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