结合颗粒模型的分析最佳校准框架用于岩石强度外建模
Xiaoxiong Zhou1,2,3, Hongyi Xu4, Qiuming Gong5
1State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China.
Scientific reports
|May 17, 2025
概括
本研究介绍了一种用于校准岩石力学离散元素模型 (DEM) 参数的自动化框架. 该方法有效地确定微参数,以准确模拟岩石强度,提高校准效率.
科学领域:
- 地质技术工程 地质技术工程
- 计算力学 计算力学 计算力学
- 岩石机械学 岩石机械学
背景情况:
- 使用粘合离散元素模型 (DEM) 精确模拟岩石强度需要精确的微参数校准.
- 当前的校准方法可能是低效的,不能充分利用微参数和宏强度之间的关系.
研究的目的:
- 开发一种分析-最佳的校准框架,用于自动确定岩石力学中的DEM键强度参数.
- 提高DEM校准的效率和准确性,以模拟岩石强度特征.
主要方法:
- 进行了广泛的参数分析,以确定DEM微参数和宏强度之间的关系.
- 开发了一种两阶段的自动校准方法:通过直接拉伸和单轴压缩测试进行初始估计,然后使用自适应时刻估计 (Adam) 进行有限差异梯度优化.
- 提出了基于灵敏度分析的简化梯度计算.
主要成果:
- 确定了纽带抗拉强度,凝聚力和局部内部摩擦角度作为关键校准变量.
- 通过很少的代和模拟,实现了Bukit Timah花岩的高校准精度.
- 证明了框架在各种岩石类型中的适用性.
结论:
- 拟议的分析-最佳框架通过充分利用微观-宏观关系有效校准DEM参数.
- 单一解决方案优化方法减少了计算需求.
- 这种方法为岩石力学应用中的DEM校准提供了显著的进步.
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