Study on pore fractal characteristics and rock constitutive model of sandstone after high temperature

被引：0
作者：
Hao J. [1 ,2 ]
Li Q. [1 ]
Qiao L. [1 ]
Deng N. [1 ]
机构：
[1] Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing
[2] School of Safety Engineering and Emergency Management, Shijiazhuang Tiedao University, Shijiazhuang
来源：
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | 2024年 / 52卷 / 02期
关键词：
constitutive model; fractal dimension; high temperature rock mechanics; nuclear magnetic resonance; pore structure;
D O I：
10.13245/j.hust.240216
中图分类号：
学科分类号：
摘要：
Based on the nuclear magnetic resonance and mechanical tests of sandstone after exposure to high temperature，combined with the fractal theory of pore structure，the dual effects of high temperature on the mechanical properties of sandstone were analyzed，and the internal mechanism of pore fractal dimension and mechanical parameters was studied．The results show that the mechanical properties are significantly enhanced in the range of 150~300 ℃．When the temperature exceeds 450 ℃，the mechanical properties are weakened． The mesopores and macropores have significant fractal characteristics，and their fractal dimensions are negatively correlated with mechanical parameters，and the nanopores have no fractal characteristics． The segmented constitutive model was established considering the post-peak stress drop．The concept of post-peak strain softening factor n was proposed．The results show that this model can reasonably reflect the variation characteristics of the stress-strain curves of sandstone． © 2024 Huazhong University of Science and Technology. All rights reserved.
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页码：142 / 148
页数：6
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