Study on Propergation Characteristics of Crack and Weathering Depending on Inherent Structure of Rock

岩石固有结构引起的裂纹与风化扩展特性研究

• 批准号: 08455486
• 负责人: MATSUI Kikuo
• 金额: $ 4.16万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455486/
• 关键词: Strength Property of Rock; Weathering of Rock; Inherent Structure of Rock; Slaking Durability Index; Propagation Characteristics of Crack; Fracture Toughness; Rock Impact Hardness Number; Application of AE Technique; 破壊靱性; 岩盤構造物の安定; 亀裂の発生と進展; 力

It is great importance to understand of the mechanism and to know of the extent of the weathring of rocks. In order to clarify the relationship between the mechanical properties, the slaking properties, and the inherent structure of rocks after the repetition of dry and wet condition, the laboratory tests such as the slaking durability test and so on were carried out. The results show that the inherent voids or/and cracks of the rocks were increased as the repetition of dry and wet condition. It is considered that lower mechanical properties and the slaking durability index were obtained under the repetition, because grown-up voids or/and cracks behave like a weakness plane. Much of the research in the slaking durability test is concerned with the effect of the dry temperature, the moisture content, and the number of cycle on the slaking phenomenon. Namely, we discussed the dependence of the parameters which were obtained by the grain size accumulation curve on the fragmentation produc … More ts after the slaking durability test. The parameters consisted of the deviation of the 50 % effective diameter in the grain size accumulation curve, the weight ratio of the products under the 2mm sieve, the uniformity coefficient, the summation of absolute value of the residual ratio difference, and the specific surface area. The results of the slaking durability test would be presented that the slaking phenomenon is increased with high deviation of the moisture content without the effect of the dry temperature Moreover, the parameter such as the deviation of the specific surface area can be determined as the slaking phenomenon in quantity.A number of approaches have been developed to determine the fracture toughness which is expressed as the magnitude of the propagation characteristics of cracks. The fracture toughness test requires the specimen to be in the precisely prescribed shape. However, it is often difficult or practically impossible in some cases, to prepare the specimen as required, with weak rocks or potentially weathering rocks. From this point of view, we discussed the index such as the tensile or the compressive strength of rocks, the rock impact hardness number (RIHN) , and the quartz content of rocks for prediction of the fracture toughness. The results show that the fracture toughness has a generally good correlation with the RIHN and the quartz content of rocks. It indecates that the propagation process of cracks depends on the fragmentation property and the inherent structure of rocks. Moreover, AE technique was tried to explore the possibility of its application in the estimation of the propagation characteristics of cracks. It is shown that the propagation characteristics of cracks and the propagation process during the slaking durability test can be predicted by using AE technique. Less

了解岩石风化的机理和程度对于阐明岩石在干湿条件重复后的力学特性、消解特性和固有结构之间的关系具有重要意义。进行了熟化耐久性试验等实验室试验，结果表明，随着干湿条件的重复，岩石的固有孔隙或/和裂缝增加，力学性能降低。熟化耐久性指数是在重复下获得的，因为长大的空隙或/和裂缝的行为就像一个薄弱平面，许多熟化耐久性测试的研究都涉及干燥温度、水分含量和循环次数的影响。即，我们讨论了通过粒度累积曲线获得的参数对熟化耐久性试验后的破碎产物ts的依赖性。这些参数包括50%有效直径的偏差。粒度累积曲线、2mm筛下产品的重量比、均匀系数、残留率差值绝对值之和、比表面积表示熟化耐久性试验的结果。在不受干燥温度影响的情况下，随着水分含量的高偏差，熟化现象会增加。此外，诸如比表面积偏差之类的参数可以在数量上确定为熟化现象。已经开发了多种方法来确定熟化现象。骨折断裂韧性测试要求试样具有精确规定的形状，但在某些情况下通常很难或实际上不可能按要求制备试样。从这个角度出发，我们讨论了岩石的拉伸或压缩强度、岩石冲击硬度值（RIHN）和岩石的石英含量等指标来预测断裂韧性。结果显示断裂韧性与岩石的 RIHN 和石英含量总体上具有良好的相关性，这表明裂纹的扩展过程取决于岩石的破碎特性和固有结构，并且尝试探索了 AE 技术的可能性。其在裂纹扩展特性估计中的应用表明，利用AE Less技术可以预测老化耐久性试验中裂纹的扩展特性和扩展过程。

项目成果

Kikuo MATSUI: "Control of Hard-to-Collapse Massive Roofs in Longwall Face Using Hydraulic Fracturing Technique" Proc.of 17th Int.Conf.on Ground Control in Mining. (受理済). (1998)

Kikuo MATSUI：“使用水力压裂技术控制长壁工作面难以塌陷的大型顶板”第 17 届采矿地面控制国际会议论文集（已接受）。

Kikuo MATSUI: "Control of Hard-to-Caltapse Massive Roofs in Longwall Face Using Hydraulic Fracturing Technique" Proc.of 17th Int.Conf.on Ground Control in Mining. 受理済. (1998)

Kikuo MATSUI：“使用水力压裂技术控制长壁工作面中的硬质石灰质顶板”第 17 届采矿地面控制国际会议论文集（1998 年）。

Herryal Z, ANWAR: "Influence of porosity on the absorption of moisture of sandstone and siltstone" Proc.of First Asian Rock Mechanics Sympo.on Environmental and Safety Concerns in Underground Constructions. Vol.1. 367-370 (1997)

Herryal Z，ANWAR：“孔隙度对砂岩和粉砂岩吸湿性的影响”，第一届亚洲岩石力学研讨会关于地下建筑环境和安全问题的会议记录。

Herryal Z.ANWAR, Hideki SHIMADA.Masatomo ICHINOSE and Kikuo MATSUI: "Influence of Porosity on the Absorption of Moisture of Sandstone and Siltstone" Proc.of First Asian Rock Mechanics Sympo.on Environmental and Safety Concerns in Underground construction.

Herryal Z.ANWAR、Hideki SHIMADA.Masatomo ICHINOSE 和 Kikuo MATSUI：“孔隙度对砂岩和粉砂岩水分吸收的影响”Proc.of First Asian Rock Mechanics Sympo. on Environmental and Safety Concerns in Underground Construction。

Kikuo MATSUI, Hideki SHIMADA and Herryal Z.ANWER: "Control of Hard-to-Collapse Massive Roofs in Longwall Face Using Fracturing Technique" Proc.of 17th Int.Conf.on Ground Control in Mining. (Accepted). (1998)

Kikuo MATSUI、Hideki SHIMADA 和 Herryal Z.ANWER：“使用压裂技术控制长壁工作面难以倒塌的大型顶板”第 17 届采矿地面控制国际会议论文集。