Acoustic and fractal analyses of the mechanical properties and fracture modes of bedding‐containing shale under different seepage pressures,Energy Science & Engineering

当前位置： X-MOL 学术 › Energy Sci. Eng. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Acoustic and fractal analyses of the mechanical properties and fracture modes of bedding‐containing shale under different seepage pressures
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-07-20 , DOI: 10.1002/ese3.772
Zhonghu Wu ₁ , Yili Lou ₁ , Shuai Yin ₂ , Anli Wang ₃ , Hao Liu ₄ , Wenjibin Sun ₄ , Yujun Zuo ₄ , Bin Chen ₄

Affiliation

The mechanical properties and failure modes of shale that contains bedding were analyzed under coupled seepage pressure and stress. In the numerical model, seven sets of shale samples with different dip‐bedding values were considered, and a seepage‐stress coupling numerical simulation was carried out. The results showed that the compressive strength of shale exhibited obvious anisotropy with increase in the bedding angle, and the compressive strength decreased with an increase in the osmotic pressure. The elastic modulus of shale showed an increasing trend with increase in the bedding angle, while the osmotic pressure had little effect on the elastic modulus of shale. The results also showed that weak bedding had a significant impact on the shale failure mode. When the osmotic pressure was 4 MPa, the shale fracture mode showed five failure modes. When the osmotic pressure was 8 MPa, the shale fracture mode exhibited four failure modes. When the osmotic pressure was 12 MPa, the shale fracture mode showed four failure modes. As the osmotic pressure increased, the osmotic pressure played a leading role in the shale rupture process. The spatial distribution of the acoustic emission demonstrated some self‐similarity patterns, and its fractal characteristics were analyzed. It was found that the fractal dimension better reflects the rupture damage to the shale. The larger the fractal dimension is, the more severe the rupture of shale.

中文翻译：

不同渗流压力下含砂页岩力学性能和断裂模式的声波和分形分析

在渗流压力和应力耦合作用下，分析了含有顺层的页岩的力学性能和破坏模式。在数值模型中，考虑了七套不同倾角层的页岩样品，并进行了渗流-应力耦合数值模拟。结果表明，随着层理角的增加，页岩的抗压强度表现出明显的各向异性，随着渗透压的增加，抗压强度降低。页岩弹性模量随层理角的增加而呈现增加趋势，而渗透压对页岩弹性模量的影响很小。结果还表明，弱层理对页岩破坏模式有重大影响。当渗透压为4 MPa时，页岩断裂模式显示出五个破坏模式。当渗透压为8 MPa时，页岩断裂模式表现出四种破坏模式。当渗透压为12 MPa时，页岩断裂模式显示出四种破坏模式。随着渗透压的增加，渗透压在页岩破裂过程中起主导作用。声发射的空间分布表现出一些自相似的模式，并分析了其分形特征。发现分形维数更好地反映了对页岩的破裂破坏。分形维数越大，页岩破裂越严重。渗透压在页岩破裂过程中起主导作用。声发射的空间分布表现出一些自相似的模式，并分析了其分形特征。发现分形维数更好地反映了对页岩的破裂破坏。分形维数越大，页岩破裂越严重。渗透压在页岩破裂过程中起主导作用。声发射的空间分布表现出一些自相似的模式，并分析了其分形特征。发现分形维数更好地反映了对页岩的破裂破坏。分形维数越大，页岩破裂越严重。

更新日期：2020-07-20

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11