床角对延页岩的动态特性的影响以及基于DIF的构成模型
Weiqi Li1,2, Shouchun Deng3,4, Kun Jiang1,2
1State Key Laboratory of Geomechanics and Geotechnical Engineering Safety, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China.
Scientific reports
|November 29, 2025
概括
这项研究分析了页岩的机械性质,揭示了异构性和强度和铺设角度之间的U形关系. 一个改进的构成模型增强了对可持续页岩气开采的预测.
科学领域:
- 地质技术工程 地质技术工程
- 石油工程是石油工程中的一个.
- 材料科学 材料科学 材料科学
背景情况:
- 传统天然气储量的耗尽推动了人们对页岩气等非传统来源的兴趣.
- 开采技术的进步使得页岩气成为一个重要的焦点.
- 了解页岩的机械行为对于有效和安全的开采至关重要.
研究的目的:
- 调查来自延岩层的页岩的机械性能和故障机制.
- 分析床铺方向和延展率对页岩的强度和变形的影响.
- 开发和验证用于高应变率负载的增强构成模型.
主要方法:
- 在页岩样本上进行了静态机械试验 (无轴压缩,三轴压缩,巴西分裂).
- 使用Split Hopkinson压力棒 (SHPB) 技术进行动态冲击测试.
- 提出并验证了一种增强的约翰逊-库克 (HJC) 构成模型,其中包含一个动态增加因子 (DIF).
主要成果:
- 页岩表现出明显的机械异质性,其强度和变形随着床铺角度显著变化.
- 动态压力强度与延展率呈正相关性.
- 在动态压力强度和床角之间观察到明显的U形关系.
- 与传统模型相比,增强的HJC模型在高应变率条件下预测页岩行为方面表现出卓越的准确性.
结论:
- 页岩的机械行为是高度异质的,并且取决于应变率.
- 提议的增强HJC模型为在动态负载下模拟页岩提供了更强大的框架.
- 这些发现提供了关键的机械参数和可靠的构成模型,以优化页岩气开采过程,确保效率和环境可持续性.
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