JPS5745417A - Method for measuring cracking state of bedrock - Google Patents

Method for measuring cracking state of bedrock

Info

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
Application number
JP55121217A
Other languages
Japanese (ja)
Inventor
Shigeru Yamazaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Komatsu Ltd
Original Assignee
Komatsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP55121217A priority Critical patent/JPS5745417A/en
Publication of JPS5745417A publication Critical patent/JPS5745417A/en
Pending legal-status Critical Current

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

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

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.
JP55121217A 1980-09-03 1980-09-03 Method for measuring cracking state of bedrock Pending JPS5745417A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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