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Fracturing Design Method based on the Fractal Fracture Mechanics

基于分形断裂力学的压裂设计方法

基本信息

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

项目摘要

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.细观强度分布和断裂过程区的应用，可以使岩石断裂过程的微观到宏观尺度下施加的负载的代表。基于这些考虑，我们提出了基于分形断裂力学的断裂过程分析。在该分析中，微观强度由威布尔分布函数模拟，断裂过程区的非弹性行为由强度软化曲线模拟。对不同的外加压力进行了断裂过程分析，研究了外加压力波形对岩石动态断裂过程的影响.从DT试验和裂纹路径分析的结果，它表明，裂纹密度和优先取向的预先存在的微裂纹影响裂纹扩展行为。岩石亚临界裂纹扩展激活能的差异是由预存微裂纹的择优取向引起的.利用微聚焦X射线CT系统对基于Hopkinson效应的岩石动态拉伸试验样品进行了三维微结构可视化研究。大量的裂纹不合并，形成一个单一的断裂面观察和多裂纹扩展的分形断裂力学预测证实。此外，还对膨润土-石英混合料和纤维水泥土的微观结构进行了观察和讨论

项目成果

期刊论文数量（24）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

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》

DOI：
发表时间：
2005
期刊：
影响因子：
0
作者：
通讯作者：

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
通讯作者：
Y. Nara;K. Koike;T. Yoneda;K. Kaneko

Model experiments on crack propagation between two charge holes in blasting

DOI：
发表时间：
2004-04
期刊：
Science and Technology of Energetic Materials : journal of the Japan Explosive Society
影响因子：
0
作者：
Yuichi Nakamura;Sang-Ho Cho;M. Yoneoka;Masaaki Yamamoto;K. Kaneko
通讯作者：
Yuichi Nakamura;Sang-Ho Cho;M. Yoneoka;Masaaki Yamamoto;K. Kaneko

Microscopic visuarization of a granitic rock subjected to dynamic tensile loading by using micro X- CT

使用显微 X-CT 对承受动态拉伸载荷的花岗岩进行显微可视化