Research on the synthetic evaluation of the discontinuity in rocks

岩石间断面综合评价研究

• 批准号: 61302072
• 负责人: TERADA Makoto
• 金额: $ 2.88万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Co-operative Research (A)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61302072/
• 关键词: Discontinuity in Rocks; Characteristics of Discontinuous Planes; Surface Configuration; Fractal Dimension; Double-Torsion Test; Propagation Velocity; スキャンライン法

The mechanical behavior of discontinuous rock masses in mainly determined by the properties of discontinuities, because the stiffness of discontinuities is greatly different from that of rock substances. Especially, the displacement is influenced by the configuration of discontinuity. Its configuration has usually an irregular surface.In this research, the surface configuration of rocks was measured as wave shape by the surface profiler and the frquency analysis was carried out on the obtained wave. The resulting power spectrum of the wave showed a characteristic curve against its frequency. It was found that the fractal dimension might be determined by this analysis on the surface configuration of rocks. Before and after a shearing test of the rock specimen with an artificial shear plane, the values of fractal dimension measured on the configuration of the shear plane were compared. It was found that the significant relationship between the fractal dimension and the strength exists in some rocks.On the other hand, the double-torsion test was carried out on several rocks. The fractal dimension was also examined on the crack surface developed by this test, regarding with the propagation velocity of crack. For these results, if the fractal dimension of the discontinuous planes can be measured, it seems to become a valuable index showing the mechanical properties of discontinuity in rocks.The scan-line method to evaluate the distribution of discontinuous planes in rock masses was developed and examined practically at some mines. The general formula for this evaluation was induced and the problems to use this method were considered. It was found that this method has a successful usage.

由于结构面的刚度与岩体的刚度有很大差异，结构面的性质决定了结构面岩体的力学行为。特别是结构面的形状对位移有较大的影响。岩石的表面形态通常是不规则的，本研究利用表面轮廓仪将岩石的表面形态测量为波形，并对所获得的波形进行了频率分析。由此产生的波的功率谱显示出与其频率对应的特征曲线。通过对岩石表面形态的分析，可以确定岩石的分形维数。对岩样进行了人工剪切面剪切试验，并对剪切面形状上的分维值进行了比较。发现某些岩石的分维与强度之间存在显着的关系。另一方面，对几种岩石进行了双扭试验。同时，对试验所形成的裂纹表面的分形维数与裂纹扩展速度的关系进行了研究。因此，如果能测量出岩体结构面的分维，它将成为反映岩体结构面力学性质的一个有价值的指标。归纳了该评价方法的一般公式，并对该方法应用中应注意的问题进行了讨论。实践证明，该方法具有较好的应用效果。

项目成果

Murata, Sumihiko, et al.: "Fundamental studies on the effect of surface roughness to the shearing strength of discontinuities in rocks." Proceedings of the 8th West Japanese Geomechanics Symposium (in Japanese). 8. 43-48 (1987)

Murata、Sumihiko 等人：“表面粗糙度对岩石不连续性剪切强度影响的基础研究。”

柴 柘海: 日本鉱業会昭和63年度春季大会研究業積発表講演会講演要旨集. (1988)

Tsukai Shiba：日本矿业协会 1988 年春季会议演讲摘要集（1988 年）。

佐野 修: 材料. 37. 152-158 (1988)

佐野修：材料。37。152-158（1988）

Sano, Osamu: "Experimental study of anisotropy of stress corrosion cracking in rocks by doubli-torsion method" Journal of the Society of Material Science, Japan. 37. 152-158 (1988)

Sano, Osamu：“通过双扭转法对岩石中应力腐蚀开裂各向异性进行的实验研究”，日本材料科学学会杂志。

Kaneko, Katsuhiko, et al.: "Quantitative evaluation of discontinuities in rocks" Proceedings of the Spring meeting, the Mining and Metallurgical Institute of Japan, 1987. 9-10 (1987)

Kaneko、Katsuhiko 等人：“岩石中不连续性的定量评估”日本矿业冶金学会春季会议记录，1987 年。 9-10 (1987)