Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (8): 2814-2820.doi: 10.16285/j.rsm.2019.1594

• Numerical Analysis • Previous Articles     Next Articles

A study of vertical bearing capacity of expansive concrete pile in coral sand foundation

DENG Wei-ting1, DING Xuan-ming1, 2, PENG Yu1   

  1. 1. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas, Chongqing University, Chongqing 400045, China
  • Received:2019-09-16 Revised:2020-01-10 Online:2020-08-14 Published:2020-10-18
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51878103，41831282).

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Abstract: To investigate the vertical bearing characteristics of expansive concrete piles embedded in coral sand foundation, the vertical static load test of single model pile was carried out in laboratory. The load-settlement curve, axial force and frictional resistance of single expansive concrete pile were analyzed, and compared with the numerical results from PLAXIS 3D software simulation. The effect of the linear expansion rates was discussed. The results show that the load-displacement curves of expansive concrete piles in coral sand show a slow change. During the loading process, the load is mainly borne by the side friction resistance of the pile. The axial force decreases with the increase of the depth, and the side friction resistance of the pile first increases with the depth and then gradually decreases, and gradually plays a role as the load increases. With the increase of expansive agent dosage, the linear expansion of pile shaft increases gradually and the pile-soil interaction becomes more obvious. Adding 25% HCSA expansive agent can increase the ultimate bearing capacity by nearly 20% and the ultimate value of pile side friction by 56%. Increasing the linear expansion rate of the pile can effectively increase the ultimate bearing capacity and side friction resistance of the pile. This study provides a reference for the pile foundation projects in calcareous sand foundation.

Key words: coral sand, expansive concrete pile, model test, bearing characteristic, numerical simulation

CLC Number: 

  • TU 473
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