Fracturing Design Method based on the Fractal Fracture Mechanics

基于分形断裂力学的压裂设计方法

• 批准号: 16206088
• 负责人: KANEKO Katsuhiko
• 金额: $ 29.62万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16206088/
• 关键词: Fractal; Rock; Fracture mechanics; Crack; X-ray CT; 3-dim. visualization; Stress corrosion; Heterogeneous material

1. The application of a microscopic strength distribution and the fracture process zone can enable representation of the rock fracture process from micro-to macro-scales under an applied load. From these considerations, we proposed a fracture process analysis based on the Fractal Fracture Mechanics. In this analysis, the microscopic strength is modeled by Weibull' s distribution function and the inelastic behavior in the fracture process zone by a strength softening curve. The proposed fracture process analysis was perfomed for various applied pressures to investigate the influence of an applied pressure waveform on dynamic fracture process in rock.2. From the results of the DT tests and crack path analysis, it was shown that the crack density and preferred orientation of the pre-existing microcracks affected the crack growth behavior. The difference between the activation energies of subcritical crack growth in rock are caused by the preferred orientation of the pre-existing microcracks.3. A micro focus X-ray CT system was used to visualize the 3-dimensional microstructure of a rock specimen used in the dynamic tension test based on the Hopkinson's effect. Numerous cracks that do not coalesce to form a single fracture plane were observed and the multi-crack growth predicted by the Fractal Fracture Mechanics is confirmed. Furthermore, microstructures of Bentnite-Quartz Mixtures and Fiber-Cement-Stabilized Soils were observed and discussed

1。微观强度分布和断裂过程区的应用可以使岩石断裂过程在施加载荷下从微观到宏观尺度表示。从这些考虑因素来看，我们提出了基于分形断裂力学的断裂过程分析。在此分析中，微观强度是由Weibull的分布函数和裂缝过程中的非弹性行为建模的，这是通过强度软化曲线来建模的。对各种施加的压力进行了完善所提出的断裂过程分析，以研究施加的压力波形对岩石中动态断裂过程的影响。2。从DT测试和裂纹路径分析的结果中，可以表明，裂纹密度和优选的微裂纹的优先取向影响了裂纹生长行为。岩石中亚临界裂纹生长的激活能之间的差异是由先前存在的微裂纹的首选方向引起的。3。使用微聚焦X射线CT系统来可视化基于霍普金森效应的动态张力测试中使用的岩石标本的3维微结构。观察到了许多不聚集形成单个断裂平面的裂纹，并确认了分形断裂力学预测的多裂缝生长。此外，观察并讨论了弯曲的夸夫兹混合物和纤维粘液稳定的土壤的微观结构

项目成果

Mining and Materials Processing Institute of JAPAN ( Kaneko, K and 22 co-authors) Rock Slope Handbook

日本采矿和材料加工研究所（Kaneko、K 和 22 位合著者）《岩石坡面手册》

• 发表时间: 2005

Relation between subcritical crack growth behavior and crack paths in granite

• DOI: 10.1016/j.ijrmms.2006.03.016
• 发表时间: 2006-12
• 期刊: International Journal of Rock Mechanics and Mining Sciences
• 影响因子: 7.2
• 作者: Y. Nara;K. Koike;T. Yoneda;K. Kaneko

Model experiments on crack propagation between two charge holes in blasting

• 发表时间: 2004-04
• 期刊: Science and Technology of Energetic Materials : journal of the Japan Explosive Society
• 作者: Yuichi Nakamura;Sang-Ho Cho;M. Yoneoka;Masaaki Yamamoto;K. Kaneko

Influence of the applied pressure waveform on the dynamic fracture process in rock

施加压力波形对岩石动态断裂过程的影响

• 发表时间: 2004
• 期刊: Int. J.of Rock Mec.s and Mining Sci. 41
• 作者: Cho;S.H.;Kaneko;K.
• 通讯作者: K.

A method for estimating the strength properties of granitic rock subjected to dynamic loading

一种估算动荷载作用下花岗岩岩石强度特性的方法

• 发表时间: 2005
• 期刊: Int. J. of Rock Mec.s and Mining Sci 42
• 作者: Cho;C.H.;Ogata;Y.;Kaneko;K.
• 通讯作者: K.