不同温度作用下砂岩能量演化机制及本构模型研究

雷瑞德; 周林森; 胡超; 李梦来; 黄凌

doi:10.3969/j.issn.0258-2724.20230714

不同温度作用下砂岩能量演化机制及本构模型研究

doi: 10.3969/j.issn.0258-2724.20230714

雷瑞德^{1, 2, 3,},
周林森¹,
胡超^1, ,,
李梦来²,
黄凌¹

1.
四川轻化工大学土木工程学院，四川自贡 643000
2.
重庆地质矿产研究院页岩气勘探开发国家地方联合工程研究中心，重庆，401120
3.
四川轻化工大学桥梁无损检测与工程计算四川省高校重点实验室，四川自贡 643000

基金项目: 中国博士后科学基金（2023MD744136）；重庆市博士后研究项目（2022CQBSHTB3109）

详细信息

作者简介:
雷瑞德（1988—），男，讲师，博士，研究方向为矿山岩石力学、数值计算，E-mail：leiruide123@163.com

通讯作者:
胡超（1991—），男，讲师，博士，研究方向为边坡可靠度分析，E-mail：chaohu8738@163.com

中图分类号: TU452
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- 文章访问数: 43
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- 被引次数: 0
出版历程
- 收稿日期: 2024-01-09
- 修回日期: 2024-04-11
- 网络出版日期: 2025-02-19

Energy Evolution Mechanism and Constitutive Model of Sandstone Subjected to Different Temperatures

LEI Ruide^{1, 2, 3
,},
ZHOU Linsen¹,
HU Chao^{1
, ,},
LI Menglai²,
HUANG Ling¹

1.
College of Civil Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
2.
National and Local Joint Engineering Research Center of Shale Gas Exploration and Development, Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China
3.
Sichuan Province University Key Laboratory of Bridge Non-Destruction Detecting and Engineering Computing, Sichuan University of Science & Engineering, Zigong 643000, China

摘要

摘要:
为研究高温对砂岩物理力学性能劣化的影响，本文开展不同温度热处理砂岩的单轴压缩试验. 首先，分析力学强度和破断模式，获得砂岩宏观力学参数的劣化特征；其次，研究不同温度对砂岩能量演化机制及弹性能耗比的影响；最后，基于温度和荷载损伤因子，采用分段函数方法构建考虑裂纹闭合阶段的热-力耦合损伤本构模型. 研究结果表明：随着温度的增加，砂岩峰值强度和弹性模量先增加后减小，在200 ℃时达到最大值；破断模式由倾斜剪切破坏向“Y”型共轭拉-剪混合破坏转变，脆-延性转变的临界温度阈值为400 ℃；根据耗散能演化特征将整个变形破裂过程划分为裂纹闭合阶段、弹性阶段、宏观裂纹扩展阶段和峰后阶段；弹性能耗比（K）的拐点可作为砂岩由弹性向塑性转变的突变点；模型尺寸参数（m）随温度升高先上升后下降，形状参数（n）逐渐降低，该参数也能反映砂岩的强度和塑性特征，理论模型与室内试验结果吻合度较高，说明本模型能够反演热-力耦合下砂岩损伤演化全过程.
- 岩石力学 /
- 高温处理 /
- 耗散能 /
- 本构模型
Abstract:
To investigate the effect of high temperature on the deterioration of the physical and mechanical properties of sandstone, uniaxial compression tests were conducted on thermally-treated sandstone subjected to different temperatures. Firstly, the deterioration characteristics of macroscopic mechanical parameters of sandstone were obtained through the analysis of mechanical strength and failure modes. Secondly, the influence of different temperatures on the energy evolution mechanism and elastic energy dissipation ratio of sandstone was studied. Finally, combined with the temperature and load damage factor, the piecewise function method was applied to develop a thermo-mechanical coupling damage constitutive model, considering the crack closure stage. The results show that as temperature increases, the peak strength and elastic modulus of thermally-treated sandstone increase first and then decrease, reaching a maximum value at 200 ℃. The failure mode transforms from oblique shear to “Y”-shaped conjugate tension–shear mixed failure, with the critical temperature threshold for the brittle and ductile transition occurring at 400 ℃. Based on dissipated energy evolution characteristics, the deformation and failure process is primarily divided into crack closure, elastic, macro-crack extension, and post-peak stages. The turning point of the elastic energy dissipation ratio (K) serves as the critical point where sandstone transitions from elastic to plastic behavior. The model’s size parameter (m) first increases and then decreases with increasing temperature, while the shape parameter (n) gradually decreases, reflecting the strength and plasticity of sandstone. The good agreement between the theoretical model and the laboratory results indicates that the model can invert the whole process of damage development of sandstone under thermo-mechanical coupling conditions.
- rock mechanics /
- thermally-treated sandstone /
- dissipated energy /
- constitutive model

HTML全文

图 1 不同温度热处理典型砂岩破坏形态

Figure 1. Failure patterns of typical thermally-treated sandstone subjected to different temperatures

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图 2 不同温度热处理典型砂岩应力-应变曲线

Figure 2. Stress–strain curves for typical thermally-treated sandstone subjected to different temperatures

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图 3 不同温度作用砂岩力学参数变化规律

Figure 3. Variation pattern of mechanical parameters for sandstone subjected to different temperatures

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图 4 不同温度热处理试样能量演化曲线

Figure 4. Energy evolution of thermally-treated sandstone subjected to different temperatures

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图 5 典型温度作用下砂岩弹性能耗散比曲线

Figure 5. Elastic energy dissipation ratio of sandstone subjected to typical temperatures

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图 6 本构模型拟合参数变化规律

Figure 6. Variation pattern of fitting parameters for constitutive model

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图 7 不同温度热处理砂岩室内试验-理论模型对比曲线

Figure 7. Comparison curves of laboratory test and theoretical model for sandstone subjected to different temperatures

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