A study on piezoelectric effect of Rock

岩石压电效应的研究

• 批准号: 09450383
• 负责人: OKUBO Seisuke
• 金额: $ 4.22万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450383/
• 关键词: Rock; Impact; piezoelectricity; electromagnetic wave; exploration; slope stability; prediction; 破壊; 地震; 地電流; 電位差; 圧電気; 圧電現象

Electromagnetic (EM) signal emitted from compressed and/or fractured rocks has been studied for many years. Some kinds of rocks contain many piezoelectric materials, for example, quartz. Therefore some researchers consider the piezoelectric effect as the dominant cause of the EM signals.An experiment was carried out in which EM signal was emitted from a block of granite which contains a lot of quartz. The block of granite was manually impacted with a hammer ; a shockless hammer or a standard steel hammer. As a result of the experiment, it was found that EM signal was emitted on hammering. The first phase of the. observed EM signal was similar to strain measured by strain gauge affixed on the steel hammer. EM signal was also observed simultaneously by the electric robes on the surface of the block. Each electric robe was located at position separated by a distance from the hammered point. No time lag or delay was observed in this case. The primary/peak value of the observed voltage was inversely proportional to the distance from the hammered point. The same results were observed in all directions through the experiments. The later part of the EM signal was similar to the elastic wave observed with an acoustic emission (AE) sensor. The elastic wave signal observed with the AE sensor was delayed in proportion to the distance from the hammered point. It can be concluded that the EM signal is relatively large and potentially used for civil or mining purposes.

从压缩和/或破裂岩石中发射的电磁（EM）信号已经研究了很多年。有些种类的岩石含有许多压电材料，例如石英。因此，有学者认为压电效应是产生电磁信号的主要原因。花岗岩块是用锤子手动撞击的;一个无冲击锤或一个标准的钢锤。作为实验的结果，发现在锤击时发射EM信号。的第一阶段。所观察到的EM信号类似于通过固定在钢锤上的应变计测量的应变。同时，在试块表面放置电衣，观察电磁信号。每一件电长袍，都位于距离锤点一定距离的位置。在这种情况下没有观察到时间滞后或延迟。所观察到的电压的主/峰值与距锤击点的距离成反比。通过实验在所有方向上观察到相同的结果。EM信号的后半部分类似于用声发射（AE）传感器观察到的弹性波。用AE传感器观察到的弹性波信号与距锤击点的距离成比例地延迟。可以得出结论，电磁信号相对较大，可能用于民用或采矿目的。

项目成果

寺嶋 卓文: "衝撃荷重下での岩石の圧電性" 資源・素材学会 平成10年秋季大会 企画発表・一般発表(A)資料 岩盤工学. 164- (1998)

Takufumi Terashima：“冲击载荷下岩石的压电”日本自然资源与材料学会 1998 年秋季会议的规划演示和一般演示材料（A）164-（1998）。

前野 沢郎: "一軸圧縮荷重下での岩石の圧電性" 資源・素材学会 平成9年秋季大会 企画発表・一般発表(A)資料 岩盤工学. 159 (1997)

Takuro Maeno：“单轴压缩载荷下岩石的压电性”日本自然资源与材料学会 1997 年秋季会议的规划演示和一般演示材料（A） 159（1997）。

前野 沢郎: "一軸圧縮荷重下での岩石の圧電性" 資源・素材学会 平成9年秋季大会 企画発表・一般発表(A)資料 岩盤工学. 159- (1997)

Takuro Maeno：“单轴压缩载荷下岩石的压电性”日本自然资源与材料学会1997年秋季会议的规划演示和一般演示材料（A）159-（1997）。

TERASHIMA,T.: "A Study on Piezoelectric Effect of Rock." Proc.Fall Meet.MMIJ, (A). 164 (1998)

TERASHIMA,T.：“岩石压电效应的研究。”

MAENO,T.: "Piezoelectricity of Rock in Uniaxial Compression" Proc.Fall Meet.MMIJ, (A). 159 (1997)

MAENO,T.：“单轴压缩中岩石的压电”Proc.Fall Meet.MMIJ，(A)。