在三轴切割下对土壤岩石混合物的电阻特性和损害演变的分析
Mingjie Zhao1,2, Songlin Chen1, Kui Wang1
1Engineering Research Center of Diagnosis Technology and Instruments of Hydro-Construction, Chongqing Jiaotong University, Chongqing 400074, China.
Materials (Basel, Switzerland)
|May 27, 2023
概括
在三轴测试期间,电阻监测有效地追踪土岩混合物 (S-RM) 中的机械损伤. 这种方法揭示了不同的损伤阶段,并改善了S-RM在压力下行为的预测.
科学领域:
- 地质技术工程 地质技术工程
- 材料科学 是一种材料科学.
- 土木工程 土木工程是指土木工程.
背景情况:
- 使用土岩混合物 (S-RM) 建造的工程结构存在重大稳定性挑战.
- 了解S-RM在负载下的机械性能和损伤演变对于结构完整性至关重要.
- 目前的分析通常集中在机械性能上,需要先进的监测技术来检测内部损坏.
研究的目的:
- 在三轴负荷条件下调查S-RM机械损伤演变特征.
- 建立和验证基于电阻测量的机械损伤模型.
- 探索岩石含量和限制压力对S-RM行为和损伤的影响.
主要方法:
- 在S-RM上使用修改后的三轴装置进行剪切测试.
- 同时测量电阻变化与应力和张力一起.
- 开发并验证了利用电阻数据的机械损伤模型.
主要成果:
- 随着轴向应变的增加,S-RM 的电阻力会降低,与变形阶段相关.
- 增加的限制压力将应力-应变行为从应变软化转变为应变硬化.
- 更高的岩石含量和限制压力提高了S-RM的承载能力.
- 损伤演化模型准确地描述了S-RM机械行为,识别了无损伤,快速损伤和稳定的损伤阶段.
- 一个结构增强因子提高了具有不同岩石含量的S-RMs的预测准确性.
结论:
- 电阻是监测S-RM内部损伤演变的可行指标.
- 开发的损伤模型为分析S-RM机械行为提供了一个强大的框架.
- 这些发现支持对地质技术结构的先进,非破坏性监测方法的开发.
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