Multi-Crack Characterization

多裂纹表征

• 批准号: 05232102
• 负责人: TAKAYASU Hideki
• 金额: $ 76.16万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05232102/
• 关键词: Fractals; Fracture; Multi-crack; Microseismicity; Universality class; Impact fracture; Lineament; Subsurface crack model; 準静的破壊; S波スプリッティング

Results obtained during the research term (1993-1995) are summarized for each researcher in the following :(1) We investigated universal properties of fracture by numerical simulations. It was proven that strong macroscopic universality holds both in the cases of crack propagation model on a plane and of 3-dimensional impact fracture (Takayasu).(2) Asynthetic modelling of geothermal structure was developed which accounts for the heat discharge at the surface, the subsurface temperature, the electric resistivity structure, the Curie point depth and the inert gas composition of fumarolic gas (Yusa).(3) The multiple cracking behavior in rock was examined based on the fractal nature of acoustic emission (AE). It is demonstrated that the multiple cracking behavior in rock could be analyzed using a numerical model in conjunction with the AE results (Hashida).(4) The conditions for propagation and unstable oscillation of cracks were characterized by nondimentional fracture parameters for both … More single crack and multiple cracks (Sano).(5) A new method of detecting and monitoring fractures by use of seismic waves was proposed. The effect of injecting air into fracture was nvestigated by using both model experiments and numerical simulations. An AVO inversion method and a depth transform technique of seismic reflection data were developed. A current-convergent resistivity log by adding auxiliary sources was investigated (Sasa).(6) A fractal model to quantify the crack distribution in rock masses and a method to evaluate model input parameters by a lineament analysis of earth satellite image have been proposed. By applying the proposed method to a granite field, the crack distribution and the connectivity of cracks have been estimated (kaneko).(7) Analytical data of aero-photo and satellite images were compared with geologically identified natural fracture systems. Geologically undefined lineaments were traced by gamma ray survey. A new analytical method for satellite image was introduced (Takashima).(8) The fractal analysis on the 1500 faults of 6 groups suggests that the relationship between the width of shear zone and fault displacement, size (displacement) distribution, and the spatial distributions of faults and fault displacements show the fractal distributions whose fractal dimensions change depending on the ductility of rocks and the total energy density injected (Ohtsuki).(9) The structure of elastic wave velocity and density of the crust is known to be heterogeneous. Analyzing the well-log data obtained at 5 wells in Kyushu and Kanto, Japan, we found that their power spectra obey a power law for a wide range in wavelength from a few tens of centimeters to a few hundred meters (Sato).(10) Fractal dimensions of splitting fracture surface of welded tuff specimens using by divider method are nearly in inverse proportion to the strength. On the other hand, the coefficient of variation of dimensions near the pre-crack in CT specimens are nealry in proportion to the fracture toughness (Tano). Less

总结了1993-1995年期间所取得的成果：（1）通过数值模拟研究了断裂的普遍性质。证明了平面裂纹扩展模型和三维冲击断裂（Takayasu）模型都具有很强的宏观普适性。(2)地热结构的综合建模开发，占在表面的热排放，地下温度，电阻率结构，居里点深度和惰性气体组成的火山气体（尤萨）。(3)基于声发射（AE）的分形特性，研究了岩石中的多重裂纹行为。它表明，在岩石中的多裂纹行为，可以使用一个数值模型结合AE结果（桥田）进行分析。(4)用无量纲断裂参数表征了裂纹扩展和失稳振荡的条件 ...更多信息 单裂纹和多裂纹（佐野）。(5)提出了一种利用地震波进行裂缝探测和监测的新方法。采用模型实验和数值模拟相结合的方法，研究了向裂缝中注入空气的效果。发展了地震反射数据AVO反演方法和深度变换技术。研究了一种附加辅助源的电流会聚电阻率测井方法（Sasa）。(6)本文提出了一种量化岩体裂隙分布的分形模型和一种利用地球卫星图像线性构造分析估算模型输入参数的方法。通过将所提出的方法应用于花岗岩领域，裂纹分布和裂纹的连通性已估计（Kaneko）。(7)将航空照片和卫星图像的分析数据与地质学确定的自然断裂系统进行了比较。地质上不确定的线性体是用伽马射线测量来追踪的。介绍了一种新的卫星图像分析方法（Takashima）。(8)对6组1500条断层的分形分析表明，剪切带宽度与断层位移的关系、大小（位移）分布、断层和断层位移的空间分布均表现为分形分布，其分维随岩石的韧性和注入的总能量密度（Ohtsuki）而变化。(9)地壳的弹性波速度和密度结构是不均匀的。通过对日本九州和关东地区5口威尔斯井的测井资料进行分析，发现它们的功率谱在从几十厘米到几百米（Sato）的波长范围内服从幂律。(10)劈裂面分形维数与强度成反比。另一方面，CT试样中预裂纹附近尺寸的变异系数与断裂韧性（Tano）近似成正比。少

项目成果

Sato,H: "Formulation of the multiple non-isotropic scattering process in 3-D space on the basis of the energy transport theory" Geophys.J.Int.121. 523-531 (1995)

Sato,H：“基于能量传输理论的 3D 空间中多重非各向同性散射过程的公式化”Geophys.J.Int.121。

大沢信二・由佐悠紀・北岡豪一: "霧島火山群の噴気不活性ガス組成" 温泉科学. 45. 290-294 (1995)

Shinji Osawa、Yuki Yusa、Goichi Kitaoka：“雾岛火山群喷气孔惰性气体的组成”《温泉科学》45. 290-294 (1995)。

H.Inaoka and H.Takayasu: "Universal fragment size distribution in a numerical model of impact fracture" Physica A. 229. 5-25 (1996)

H.Inaoka 和 H.Takayasu：“冲击断裂数值模型中的通用碎片尺寸分布”Physica A. 229. 5-25 (1996)

K.Watanabe and H.Takahashi: "Parametric Study of the Energy Extraction from Hot Dry Rock Based on Fractal Fracture Network Model" Geothermics. 24-3. 223-236 (1995)

K.Watanabe 和 H.Takahashi：“基于分形断裂网络模型的干热岩石能量提取的参数研究”地热学。

A.Yuse and M.Sano: "Transition between crack patterns in quenched glass plate" Nature. 362. 329-331 (1993)

A.Yuse 和 M.Sano：“淬火玻璃板裂纹图案之间的过渡”自然。