Influence of grain size on the strain-rate-dependent dynamic response of sandstones
文献类型:期刊论文
作者 | Yu M(于淼)4; Li, Shaohua1; Sun, Qianyu3; Wang, Shuang2 |
刊名 | GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES |
出版日期 | 2021 |
卷号 | 7期号:3页码:1-15 |
ISSN号 | 2363-8419 |
关键词 | Coalbed methane (CBM) exploitation Grain size Rate dependence Microcrack evolution Sensitivity zone |
产权排序 | 1 |
英文摘要 | Shock wave fracturing is a novel technology in coalbed methane (CBM) exploitation. Understanding dynamic damage and failure mechanisms of rock with different grain sizes is of vital importance to shock wave fracturing. In this study, we investigate the influence of grain size on the dynamic compressive strength and failure modes of sandstones under strain rates ranging from 20 to 100 s(-1) and the corresponding mesoscopic responses. The Split Hopkinson Pressure Bar (SHPB) results show that finer-grained samples are mildly fragmented with a moderate strength increase (longer microcracks with lower density) at lower strain rates ((epsilon) over dot = 20-60 s(-1)) but intensively fragmented with a steeper strength increase (shorter microcracks with higher density) at higher strain rates ((epsilon) over dot = 60-100 s(-1)). However, the trend for coarse-grained samples is the opposite. Microcracking characteristics of the tested samples were then obtained using optical microscopy. The microcrack density and the microcrack length may be used to explain the strain-rate dependence of the dynamic compressive strength and fracturing modes of the samples, respectively. These results may be helpful to build a multiscale framework to analyze the natured mechanism of crack production in CBM exploitation. Article Highlights The influence of grain size on the dynamic compressive strength and failure modes of sandstones werediscussed under medium strain rates and the corresponding mesoscopic responses; Finer-grained samples are mildly fragmented with a moderate strength increase at lower strain rates butintensively fragmented with a steeper strength increase at higher strain rates compared with coarser-grained ones; The microcrack density and the microcrack length may be used to explain the strain-rate dependence of thedynamic compressive strength and fracturing modes of the samples, respectively. |
语种 | 英语 |
WOS记录号 | WOS:000667686200001 |
资助机构 | National Key Research and Development Program of China [2020YFA0710500] |
源URL | [http://ir.sia.cn/handle/173321/29312] |
专题 | 沈阳自动化研究所_空间自动化技术研究室 |
通讯作者 | Yu M(于淼) |
作者单位 | 1.Department of the Built Environment, Eindhoven, University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands 2.State Key Laboratory for Turbulence and Complex System, School of Resource and Civil Engineering, Peking University, Beijing 100871, China 3.State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing 100084, China 4.State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang, China |
推荐引用方式 GB/T 7714 | Yu M,Li, Shaohua,Sun, Qianyu,et al. Influence of grain size on the strain-rate-dependent dynamic response of sandstones[J]. GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES,2021,7(3):1-15. |
APA | Yu M,Li, Shaohua,Sun, Qianyu,&Wang, Shuang.(2021).Influence of grain size on the strain-rate-dependent dynamic response of sandstones.GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES,7(3),1-15. |
MLA | Yu M,et al."Influence of grain size on the strain-rate-dependent dynamic response of sandstones".GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES 7.3(2021):1-15. |
入库方式: OAI收割
来源:沈阳自动化研究所
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