AE Activities and Fatigue Limits on Rocks under Cyclic Compressive Loading

循环压缩荷载下岩石的声发射活动和疲劳极限

• 批准号: 05452315
• 负责人: YAMASHITA Shigeru
• 金额: $ 4.61万
• 依托单位: Akita University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452315/
• 关键词: Rock; Fatigue test; Fatigue limit; Uniaxial compression test; Acoustic emission; Yielding stress; 載荷・除荷一軸圧縮試験; 繰り返し載荷試験

In this study, fatigue and uniaxial compression tests were done on OGINO tuff, Akiyoshi marble and Kimachi sandstone with monitoring AE (acoustic emission) activity.The yieldind stresses of three kinds of rocks are determined by Kaizer's effect, based on the results obtained with the uniaxial compression tests. Also, the fatigue limits of the rocks are estimated from the results obtained with the fatigue tests where the maximum stress takes a prescribed percentage of the uniaxial compressive strength of the rock and the minimum stress alwasys keeps about 1MPa. From the comparison of the fatigue limit with the yielding stress on each rock, it is found that the fatigue limit of the rock doesn't always correspond to its yielding stress. Accordingly, it is necessary to perform the fatigue tests in order to determine the fatigue limit of a rock.The behavior of the upper strain during fatigue tests is similar to that during creep test and is classified into three regions that correspond to primary, secondary and tertiary creep regions in creep.On the other hand, as the maximum stress is higher, the cumulative number of AE events is proportional to the number of the loading cycles and then specimen is failed. In case that the maximum stress is lower, AE activity becomes vigorous just prior to the failure of the specimen. The increasing point of the cumulative number of AE events doesn't correspond to the transitional point from secondary to tertiary region, and is found out in tertiary region.

在这项研究中，对Ogino Tuff，Akiyoshi Marble和Kimachi砂岩进行了疲劳和单轴压缩测试，并具有监测AE（声发射）活性。三种岩石的屈服应力是由Kaizer的效应确定的，它根据Kaizer的效应确定。单轴压缩测试。同样，岩石的疲劳极限是从疲劳测试获得的结果中估计的，在疲劳测试中，最大应力占岩石单轴抗压强度的规定百分比，而最小应力ALWASYS则保持约1MPA。从疲劳极限与每个岩石上的屈服应力的比较，可以发现岩石的疲劳极限并不总是与其屈服应力相对应。因此，有必要进行疲劳测试以确定岩石的疲劳极限。疲劳测试期间的上部应变的行为与蠕变测试中的行为相似，并分类为三个与主要，次要和次级和次要和相对应的区域另一方面，由于最大应力较高，AE事件的累积数与负载周期的数量成正比，然后样品失败。如果最大应力较低，则在样品失败之前，AE活性变得剧烈。 AE事件的累积数量的增加点与从次生区域到第三区域的过渡点相对应，并且在第三区域被发现。

项目成果

S.Yamashita, F.Sugimoto, M.Yamauchi and S.Mori: "Studies on Creep Process and Mechanism of Rock" Proc.of MMIJ/AusIMM Joint Sym. 341-350 (1994)

S.Yamashita、F.Sugimoto、M.Yamauchi 和 S.Mori：“岩石蠕变过程和机理研究”Proc.of MMIJ/AusIMM Joint Sym。

杉本文男、山下 秀、赤羽 茂: "損傷を受けた砂岩の疲労特性" 1994年資源・素材学会春季大会研究・業績発表講演会. 115-116 (1994)

Fumio Sugimoto、Hide Yamashita、Shigeru Akabane：“受损砂岩的疲劳特性”1994 年日本自然资源与材料学会春季会议研究和成果演讲 115-116 (1994)。

S.Yamashita, F.Sugimoto and S.Akahane: "-deformation characteristics and AE activities on Rocks during Compressive Fatigue Process" Journal of the Mining and Materrial Processing of Japan. (To be published).

S.Yamashita、F.Sugimoto 和 S.Akahane：“压缩疲劳过程中岩石的变形特征和 AE 活动”日本采矿和材料加工杂志。

山下 秀、杉本文男、山内 優、森 聡: "岩石のクリープ破壊過程における内部破壊の進行状況について" 1994年資源・素材学会春季大会研究・業績発表講演会. 105-106 (1994)

Hide Yamashita，Fumio Sugimoto，Yu Yamauchi，Satoshi Mori：“岩石蠕变断裂过程中内部断裂的进展”1994年日本资源材料学会春季会议研究和成果演讲105-106（1994）。

山下秀、杉本文男、山内優、川辺金光: "大谷石のクリープ特性とクリープ過程について" 資源と素材. 110. 875-882 (1994)

Hide Yamashita、Fumio Sugimoto、Yu Yamauchi、Kanemitsu Kawabe：“论大谷石的蠕变特性和蠕变过程”资源和材料 110。 875-882 (1994)