Study on rock strength deterioration and weathering for soft and semi-hard rocks in dry-wet cyclic conditions

干湿循环条件下软、半硬岩石强度劣化及风化研究

• 批准号: 11650960
• 负责人: ICHINOSE Masatomo
• 金额: $ 0.51万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650960/
• 关键词: Rock mass (underground) structure; Soft rock, semi-hard rock; Stability for semi-long and long term; Dry-wet cyclic condition; Weathering; Change of the mechanical properties; Guideline of weathering; 岩盤構造物; 中・長期的な安定性; 岩石の風化; 内部構造の変化

The subjects of this research is to understand about the mechanism of the deterioration of rock strength in the dry-wet cyclic conditions, how to establish an evaluation method of them and to suggest a technical guideline to judge a grade of the weathering by the internal structures of rock such as porosity, distribution of the diameter of pores, the specific surface areas and cracks.The outline of this research is as follows :1) It is understood that the mechanical properties of measures rocks such as shale that were collected from Indonesian and domestic coal mines.2) The slaking phenomenon was examined by the slaking observation method and the ISRM suggested method. Those results show the slaking deterioration was recognized for all rock specimens. The extent of slaking deterioration of Indonesian specimens was larger than that of domestic specimens.3) The porosity and the distribution of the diameter of pores of specimens were obtained by the mercury pressure method. From the comparison between the Indonesian specimens and the domestic specimens, the distributions of the diameter of pores of Indonesian specimens are similar to that of domestic ones, however, the total volume of the pores of Indonesian ones are larger that domestic ones.4) The mechanical properties such as the unconfined compressive strength, the Brazilian strength and Young's modulus after testing in the dry-wet cyclic conditions were 1/2 to 1/3 lower than those of dry specimens. Specially, some specimens for the mechanical testing could not be obtained due to slaking phenomenon. We are now considering how to evaluate the characteristics for those types of rocks.5) Visualization of the internal cracks and pores was carried out by the X-ray CT.It is possible to evaluate only the qualitative visualization for the sizes of 50-100 μ m of cracks and pores.

本研究的目的是了解干湿循环条件下岩石强度劣化的机理，建立其评价方法，并提出根据内部结构判断风化程度的技术指南。岩石的孔隙率、孔隙分布、比表面积和裂缝。本研究的概要如下：1）据了解，测量从印度尼西亚收集的页岩等岩石的机械性能的直径和国内煤炭2）通过崩解观测方法和ISRM建议的方法对崩解现象进行了检验，结果表明所有岩石样本均出现了崩解劣化现象，印度尼西亚样本的崩解劣化程度大于国内样本。3。 ）通过水银压力法获得试件的孔隙率和孔径分布，通过对印尼试件与国内试件的比较，得出：印尼试件的孔隙分布与国内相似，但印尼试件的孔隙总体积直径比国内试件大。 4）无侧限抗压强度、巴西强度、杨氏强度等力学性能干湿循环条件下测试后的模量比干试样低1/2至1/3，特别是一些试样由于熟化而无法获得用于力学测试的试样。我们现在正在考虑如何评估这些类型岩石的特征。5) 通过 X 射线 CT 进行内部裂缝和孔隙的可视化。可以仅评估尺寸为 50 的定性可视化。 -100微米的裂纹和孔隙。

项目成果

K.Matsui,T.Sasaoka,H.Shimada,M.Ichinose,S.Kubota: "Disposal and Utilization of Mine Waste Rocks and Flyash as a Coal Mine Backfill"Proc.of 6th Int.Sympo.on Environmental Issues and Waste Management in Energy and Mineral Production, Calgary CANADA. 219-224

K.Matsui,T.Sasaoka,H.Shimada,M.Ichinose,S.Kubota：“矿山废石和粉煤灰作为煤矿回填物的处理和利用”第 6 届环境问题和废物管理国际研讨会论文集

K.Matsui, H.Shimada, M.Ichinose, S.Kramadibrate, H.Z.Anwar: "Drivage of a New Incline with a Roadheader at Ombilin Coal Mine, Indonesia"Proc.of 9th Int. Sympo.on Mine Planning and Equipment Selection, Athens GREECE. 83-88 (2000)

K.Matsui、H.Shimada、M.Ichinose、S.Kramadibrate、H.Z.Anwar：“印度尼西亚 Ombilin 煤矿采用掘进机掘进新斜坡”Proc. of 9th Int.

H.Z.Anwar,H.Shimada,M.Ichinose,K.Matsui: "Slaking Phenomenon of the Expandable Clay-bearing Rock"Proc.of Annually Scientific Meeting of Indonesian Association of Geologist, Bundung INDONESIA. 65-75 (2000)

H.Z.Anwar、H.Shimada、M.Ichinose、K.Matsui：“可膨胀粘土岩石的消解现象”，印度尼西亚地质学家协会年度科学会议，印度尼西亚万隆。

K.Matsui,H.Shimada,M.Ichinose,S.Kramadibrata,H.Z.Anwar: "Drivage of a New Incline with a Roadheader at Ombilin Coal Mine, Indonesia"Proc.of 9th Int.Sympo.on Mine Planning and Equipment Selection, Athens GREECE. 83-88 (2000)

K.Matsui、H.Shimada、M.Ichinose、S.Kramadibrata、H.Z.Anwar：“印度尼西亚 Ombilin 煤矿采用掘进机掘进新斜坡”Proc.of 9th Int.Sympo.on Mine Planning and Equipment Selection，

K.Matsui,H.Shimada,M.Ichinose,S.Kramadibrata,H.Z.Anwar: "Drivage of a New Incline with a Roadheader at Ombilin Coal Mine, Indonesia"Proc.of 9th Int.Sympo.on Mine Planning and Equipment Selection, Athens GREECE. 83-88 (2000)

K.Matsui、H.Shimada、M.Ichinose、S.Kramadibrata、H.Z.Anwar：“印度尼西亚 Ombilin 煤矿采用掘进机掘进新斜坡”Proc.of 9th Int.Sympo.on Mine Planning and Equipment Selection，