• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
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Volume 58 Issue 3
Jun.  2023
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Article Contents
CUI Kai, CI Wei, YANG Shangchuan. Influence of Sand Sampling Method on Bearing Capacity Calculation of Shallow Foundation in Discrete Element Method[J]. Journal of Southwest Jiaotong University, 2023, 58(3): 575-583. doi: 10.3969/j.issn.0258-2724.20210620
Citation: CUI Kai, CI Wei, YANG Shangchuan. Influence of Sand Sampling Method on Bearing Capacity Calculation of Shallow Foundation in Discrete Element Method[J]. Journal of Southwest Jiaotong University, 2023, 58(3): 575-583. doi: 10.3969/j.issn.0258-2724.20210620

Influence of Sand Sampling Method on Bearing Capacity Calculation of Shallow Foundation in Discrete Element Method

doi: 10.3969/j.issn.0258-2724.20210620
  • Received Date: 03 Aug 2021
  • Rev Recd Date: 16 Nov 2021
  • Available Online: 25 Oct 2022
  • Publish Date: 18 Nov 2021
  • In the discrete element numerical simulation, different sample preparation methods will lead to differences in soil void ratio and uniformity, which will affect the simulation results of bearing capacity of shallow foundation. Therefore, it is necessary to analyze the influence of different sample preparation on bearing capacity of shallow foundation. Four methods (e.g., particle amplification method, distribute method, grid method, and under compaction method) were used to prepare the samples of cohesionless sand, and the samples were balanced under the gravity field of 10g. The void ratio, horizontal stress and vertical stress of soil at different positions were monitored by measuring circle, and the average void ratio e and the lateral earth pressure coefficient K0 value less than 1 were obtained. The influence of different sample preparation methods on the bearing capacity of shallow foundation was studied by placing rigid wall on the surface of the sample and loading at the same speed to simulate the bearing capacity test of shallow foundation. The results show that the porosity ratios of samples generated by the GM and under compaction method are closer to the original target porosity ratio with an error of about 3.5%. In comparison, the porosity ratios generated by particle amplification method and distribute method are smaller than the target porosity ratio, with an error of about 20.0%. Additionally, GM presents the most homogeneous sand samples, followed by the under compaction method, distribute method and particle amplification method, respectively. Due to the varying porosity ratios and K0 of samples, the obtained bearing capacity of shallow foundation also changes. The relationship of bearing capacity obtained by different sample preparation methods in the simulation of bearing capacity of shallow foundation is : GM < underlayer compaction method < particle size amplification method < distribute method.

     

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