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山东大学学报 (工学版) ›› 2025, Vol. 55 ›› Issue (4): 93-107.doi: 10.6040/j.issn.1672-3961.0.2024.271

• 土木工程 • 上一篇    

基于PFC-GBM方法的矿物组成对花岗岩单轴压缩力学特性影响

张庆豪1,2,3,马瑞阳1,2,3,林鹏1,2,3*,谢辉辉2,3,4,王朝阳1,2,3,亢金涛1,2,3,娄彦飞1,2,3   

  1. 1.山东大学齐鲁交通学院, 山东 济南 250002;2.隧道工程灾变防控与智能建养全国重点实验室, 山东 济南 250061; 3.山东大学岩土与地下工程研究院, 山东 济南 250061;4.山东大学土建与水利学院, 山东 济南 250061
  • 发布日期:2025-08-31
  • 作者简介:张庆豪(2001— ),男,山东聊城人,硕士研究生,主要研究方向为岩土体颗粒流数值模拟. E-mail:202215402@mail.sdu.edu.cn. *通信作者简介:林鹏(1989— ),男,山东潍坊人,教授,博士生导师,博士,主要研究方向为隧道及地下工程地质灾害预测预报与处置. E-mail: sddxytlp@sdu.edu.cn
  • 基金资助:
    国家自然科学基金面上资助项目(52279103,52379103);山东省自然科学基金优秀青年基金资助项目(ZR2023YQ049)

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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摘要： 为研究花岗岩内各类矿物的体积分数、矿物粒径大小、矿物粒径分布非均匀性3个因素对花岗岩抗压力学特性的影响规律,采用GBM(grain-based model)方法对花岗岩微观矿物组成建模,确定了各因素影响抗压力学特性的强弱,在裂纹演化的角度揭示各因素影响抗压力学特性的机理。研究结果表明: 各参数与花岗岩强度均有较高的相关性,花岗岩抗压强度随石英、长石体积分数及平均粒径的增长呈上升趋势,随云母体积分数与非均质因子的增加呈下降趋势;矿物体积分数对强度影响由强到弱为石英、长石、云母体积分数,粒径参数对强度影响次序为平均粒径、非均质因子;矿物体积分数与晶内3种接触占比增减的相关性较高,平均粒径主要影响晶内与晶间接触占比,非均质因子则会导致同种与异种晶间接触占比发生变化,这3种方式都能够在不同程度上改变模型破裂所消耗的能量和裂纹发育路径,进而影响单轴抗压强度。

关键词: 花岗岩, 矿物组成, GBM模型, particle flow code(PFC), 抗压强度, 裂纹演化

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

中图分类号: 

  • TU452
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