Journal of Shandong University(Engineering Science) ›› 2025, Vol. 55 ›› Issue (4): 93-107.doi: 10.6040/j.issn.1672-3961.0.2024.271

• Civil Engineering • Previous Articles    

The influence of mineral composition on uniaxial compression mechanical properties of granite based on PFC-GBM method

ZHANG Qinghao1,2,3, MA Ruiyang1,2,3, LIN Peng1,2,3*, XIE Huihui2,3,4, WANG Zhaoyang1,2,3, KANG Jintao1,2,3, LOU Yanfei1,2,3   

  1. ZHANG Qinghao1, 2, 3, MA Ruiyang1, 2, 3, LIN Peng1, 2, 3*, XIE Huihui2, 3, 4, WANG Zhaoyang1, 2, 3, KANG Jintao1, 2, 3, LOU Yanfei1, 2, 3(1. School of Qilu Transportation, Shandong University, Jinan 250002, Shandong, China;
    2. State Key Laboratory for Tunnel Engineering, Jinan 250061, Shandong, China;
    3. Institute of Geotechnical and Underground Engineering, Shandong University, Jinan 250061, Shandong, China;
    4. School of Civil Engineering, Shandong University, Jinan 250061, Shandong, China
  • Published:2025-08-31

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Abstract: In order to investigate the influence of three factors, namely the volume fraction, particle size and non-uniform distribution of various minerals in granite, on its compressive properties, the GBM(grain-based model)method was used to model the mineral composition of granite, to determine the strength of each factor's influence on compressive mechanical properties, and to reveal the mechanism of each factor's influence on compressive mechanical properties from the perspective of crack evolution. The results of the research showed that: each parameter had a high correlation with the strength of granite, and the granite compressive strength tended to increase with the growth of quartz and feldspar volume fraction and average grain size, and decrease with the increase of mica volume fraction and non-homogeneous factor; the influence of the mineral volume fraction parameter on the strength was in the order of strongest to weakest, which was the quartz, feldspar and mica, and the influence of the grain size parameter on the strength was in the following order average grain size, non-homogeneous factor; the correlation between the mineral volume fraction and the three types of intracrystalline contact ratio was high, the average grain size mainly affected the intracrystalline and inter-crystalline contact ratio, and the non-homogeneous factor led to change in the contact ratio of homogeneous and heterogeneous inter-crystalline contact, which were able to change the model rupture of the energy consumed and the path of crack development in varying degrees, and thus affected the uniaxial compressive strength.

Key words: granite, mineral composition, grain-based model, PFC, compressive strength, crack evolution

CLC Number: 

  • TU452
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