JPS5745417A - Method for measuring cracking state of bedrock - Google Patents
Method for measuring cracking state of bedrockInfo
- Publication number
- JPS5745417A JPS5745417A JP55121217A JP12121780A JPS5745417A JP S5745417 A JPS5745417 A JP S5745417A JP 55121217 A JP55121217 A JP 55121217A JP 12121780 A JP12121780 A JP 12121780A JP S5745417 A JPS5745417 A JP S5745417A
- Authority
- JP
- Japan
- Prior art keywords
- vibrator
- bedrock
- cracking
- measured
- state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/11—Analysing solids by measuring attenuation of acoustic waves
Abstract
PURPOSE:To measure the state of cracking by detecting the amplitude attenuation rate of the elastic waves in the part of bedrock to be measured. CONSTITUTION:First, a transmission vibration 1 and a reception vibrator 2 are pressed by load P, and elastic waves are applied to the vibrator 1 by a pulse generator 3, thence the amplitude A0 of the vibrator 2 is measured. Next, a part 4 of prescribed bedrock is provided between the vibrator 1 and the vibrator 2, and the amplitude A1 of the vibrator is similarly measured. Next, the difference A between the A0 and the A1 is determined, and the amplitude attenuation rate A of elastic waves is detected, whereby the state of cracking is judged. If the cracking is large, the rate A increases and if small, it decreases and therefore, the cracking state of said bedrock is judged if the amplitude attenuation rate of the elastic waves is measured.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55121217A JPS5745417A (en) | 1980-09-03 | 1980-09-03 | Method for measuring cracking state of bedrock |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55121217A JPS5745417A (en) | 1980-09-03 | 1980-09-03 | Method for measuring cracking state of bedrock |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5745417A true JPS5745417A (en) | 1982-03-15 |
Family
ID=14805775
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55121217A Pending JPS5745417A (en) | 1980-09-03 | 1980-09-03 | Method for measuring cracking state of bedrock |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5745417A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60256051A (en) * | 1984-06-01 | 1985-12-17 | Mitsubishi Heavy Ind Ltd | Non-destructive inspection apparatus |
JP2002206907A (en) * | 2001-01-10 | 2002-07-26 | Central Res Inst Of Electric Power Ind | Rockbed crack measuring method and device thereof |
JP2019078557A (en) * | 2017-10-20 | 2019-05-23 | 株式会社Ihiエアロスペース | Particulate dispersed elastomer separation measuring device and separation measurement method |
-
1980
- 1980-09-03 JP JP55121217A patent/JPS5745417A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60256051A (en) * | 1984-06-01 | 1985-12-17 | Mitsubishi Heavy Ind Ltd | Non-destructive inspection apparatus |
JP2002206907A (en) * | 2001-01-10 | 2002-07-26 | Central Res Inst Of Electric Power Ind | Rockbed crack measuring method and device thereof |
JP4562158B2 (en) * | 2001-01-10 | 2010-10-13 | 財団法人電力中央研究所 | Rock crack measuring method and apparatus |
JP2019078557A (en) * | 2017-10-20 | 2019-05-23 | 株式会社Ihiエアロスペース | Particulate dispersed elastomer separation measuring device and separation measurement method |
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