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在冰解周期负荷下,研究不同石质的砂岩的损伤演变机制

Junpeng Li^1,2, Wencai Wang², Hongbo Yao¹

¹School of Energy Industry, Shanxi College of Technology, Shuozhou, China.

Science progress

|August 12, 2025

概括

这项研究揭示了结解周期如何损害不同的砂岩,确定了不同的故障阶段,以及在寒冷地区工程安全的关键损害点.

科学领域:

地质技术工程地质技术工程
材料科学材料科学材料科学
土木工程土木工程是指土木工程.

背景情况:

砂岩是一种常见的工程材料,但其性能在融周期下降低,特别是在寒冷的气候下.
温度波动会导致岩石的应力和损伤,导致工程项目中的稳定性问题.
不同的岩石石质表现出独特的损坏机制在融和加载条件下.

研究的目的:

调查绿色砂岩 (QSY) 和黄色砂岩 (HSY) 在结合冷解和加载下损害演变机制.
分析不同孔隙结构和矿物成分对岩石降解的影响.
建立一个损害模型,用于预测循环环境压力下岩石破裂.

主要方法:

对QSY和HSY样本进行了冷解和负荷测试,在-30°C至30°C之间进行0-40周期.
利用理论分析和实验方法来监测应力,弹性模量和声辐射事件.
开发了一个三阶段损害演变模型 (静止,加速,稳定).

主要成果:

在QSY和HSY的峰值应力和弹性模量中确定了明显的变化模式,随着结解周期的增加.
QSY比HSY更显著地降解,在30个周期内从脆性转变为塑性故障,而HSY保持脆性.
建立了结解周期和初始损伤之间的相关性,突出了QSY更高的易感性,并确定了加速损伤阶段对不稳定性至关重要.

结论:

由于矿物成分和孔隙结构的差异,QSY比HSY更容易受到冷解损伤.
该研究确定了岩石损伤的五个进化阶段,以及在环境压力组合下预测损伤模型.
了解这些损坏机制对于评估寒冷地区工程结构的稳定性和安全性至关重要.

关键词:

结解的周期.伤害进化伤害进化最初的损伤初始损伤宏观破裂宏观破裂是一种破裂.峰值的压力是压力的高峰.

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