Uniaxial compression simulation of cemented soil based on microstructural hydration units

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  • (College of Transportation Engineering, Dalian Maritime University, Dalian 116026, China)

Received date: 2023-03-06

  Revised date: 2023-04-11

  Accepted date: 2023-04-11

  Online published: 2023-09-12

Abstract

To realize the application of particle flow code (PFC) method in strength prediction, according to the microstructure characteristics of various types of hydration products, numerical models of both ordinary Portland cement-soil and sulfur aluminate cement-soil were constructed respectively based on the micro hydration unit by using PFC method to simulate their mechanical response under uniaxial compression, and compared with experimental results. The analysis of parallel bonding parameters among particles shows that the parallel bonding modulus is the main influencing factor of macroscopic elastic modulus, and the two exhibit a quadratic nonlinear growth relationship. There is a linear growth relationship between parallel bonding strength and peak stress. Within the value interval of parameter, the hydration unit can simulate the direction and number of oblique cracks that match the experimental phenomenon. The micro parameters of two types of cement soil were determined using uniaxial compression experimental curves with a cement content of 15%. Based on the determined parameters, when the simulated cement content was between 9% and 12%, the errors between the peak stress and elastic modulus of uniaxial compression obtained by the model and the experimental results were less than 5%; When the cement content is 6%, the error is slightly higher, but still less than 9%. The simulation results show that the micro hydration unit can be used to simulate and predict the peak stress and elastic modulus of cement soil under uniaxial compression, which provides a new approach for the establishment of other material models.

Cite this article

ZHU Jin, ZHAO Jiuye, CUI Chunyi, SUN Xiannian, YU Chunyang . Uniaxial compression simulation of cemented soil based on microstructural hydration units[J]. Journal of Dalian Maritime University, 2023 , 49(3) : 138 -147 . DOI: 10.16411/j.cnki.issn1006-7736.2023.03.015

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