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Geokon Stressmeter 4300 Series, Инструкция по эксплуатации

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Instruction Manual 

Vibrating Wire  

Stressmeter 

4300 Series (EX, BX, NX)

 

No part of this instruction manual may be reproduced, by any means, without the written consent of Geokon, Inc. 

The information contained herein is believed to be accurate and reliable. However, Geokon, Inc. assumes no responsibility for 

errors, omissions or misinterpretation. The information herein is subject to change without notification.

 

Copyright © 1984, 2004 by Geokon, Inc. 

(Doc Rev C, 04/07) 

Содержание Stressmeter 4300 Series

Страница 1: ...ny means without the written consent of Geokon Inc The information contained herein is believed to be accurate and reliable However Geokon Inc assumes no responsibility for errors omissions or misinterpretation The information herein is subject to change without notification Copyright 1984 2004 by Geokon Inc Doc Rev C 04 07 ...

Страница 2: ......

Страница 3: ...re are no warranties except as stated herein There are no other warranties expressed or implied including but not limited to the implied warranties of merchantability and of fitness for a particular purpose Geokon Inc is not responsible for any damages or losses caused to other equipment whether direct indirect incidental special or consequential which the purchaser may experience as a result of t...

Страница 4: ......

Страница 5: ... TYPE 4 3 5 RECOVERING THE STRESSMETER 5 3 6 SPLICING AND JUNCTION BOXES 5 4 TAKING READINGS 6 4 1 OPERATION OF THE GK 403 OR GK 401 READOUT BOX 6 4 2 OPERATION OF THE GK404 READOUT BOX 6 5 DATA REDUCTION 7 5 1 GAGE SENSITIVITY FACTORS 7 5 2 CORRECTIONS FOR TEMPERATURE CHANGES 9 5 3 ENVIRONMENTAL FACTORS 10 6 TROUBLE SHOOTING 10 TABLE 1 THERMISTORS 11 APPENDIX 1 BIAXIAL STRESS CHANGES 12 REFERENCE...

Страница 6: ...RE STRESSMETER INSTALLATION TOOL ASSEMBLY 4 FIGURE 3 MODEL 4300EX VIBRATING WIRE SRESSMETER SENSITIVUTY FACTOR VS ROCK MODULUS 8 FIGURE 4 MODEL 4300BX VIBRATING WIRE SRESSMETER SENSITIVUTY FACTOR VS ROCK MODULUS 8 FIGURE 5 MODEL 4300NX VIBRATING WIRE SRESSMETER SENSITIVITY FACTOR VS ROCK MODULUS 9 ...

Страница 7: ...s 29 1 125 48 1 875 64 2 50 Inner Diameter mm inches 13 0 5 22 0 875 32 1 25 Weight kgm lbs 0 45 1 0 9 2 1 4 3 Borehole Diameter mm inches 38 1 485 60 2 36 76 2 98 Gage Materials 17 4 SS 304 SS 17 4 SS 304 SS 17 4 SS 304 SS Cable 2 conductor or 4 conductor shielded 22 gage PVC jacket 5mm dia or 6mm dia 1 Depends on rock modulus 2 Accuracy depends to a large extent on the roughness of the borehole ...

Страница 8: ...ation of the stressmeter with respect to the principal rock stress direction and platen contact area Thus the accuracy of the gage reading is largely indeterminate and the indicated stress magnitude can only be approximate A coil and magnet assembly located close to the wire is used both to excite the wire and sense the resultant frequency of vibration When the gage is connected a pulse of varying...

Страница 9: ...it drilled holes provided that care is taken to get the proper hole diameter with a smooth wall If the walls are rough the gage response calibration can be radically affected The Model 4300EX Stressmeter is designed for use in EX diamond drill holes 38mm 1 5 and the hole can range in diameter from 37mm 1 45 to 39mm 1 55 when using the standard wedge and platen assembly The Model 4300BX Stressmeter...

Страница 10: ...od has one end with a 20 Left Hand Thread on it This will connect to the left hand thread in the yoke Attach the first section of the positioning rod to the back of the setting tool head Push the stressmeter into the hole using the positioning rod The buttons on the setting rod connectors indicated the orientation of the wedge platen assembly Thus for making measurements in a vertical direction ke...

Страница 11: ...ong with the setting tool head which is used to strike the outer tip of the wedge This will drive the wedge out from under the platen and allow the stressmeter to be pulled from the hole using the electrical cable Make sure that the setting head is twisted so that the flat part of the front face lies opposite the wedge The entire stressmeter can sometimes be recovered in this way i e the wedge pla...

Страница 12: ...east significant digit This is not to say that the readings are not accurate it simply means that the period of vibration changes very slightly from one pluck to the next In most cases the displayed numbers should be rounded to the next least significant digit For very stable stressmeters the last digit can give very valuable information on very small stress changes and for that reason the numbers...

Страница 13: ... and applied stress A reading of 10 000 on channel F corresponds to a period of 316 2 microseconds on channel A To obtain the change in stress at any given time the following equation applies σ R1 R0 G where σ stress in psi R0 initial reading at zero stress B or F GK 401 or GK 403 R1 reading at subsequent stress B or F GK 401 or GK 403 G sensitivity factor taken from Fig 3 4 or 5 For example EX BX...

Страница 14: ...8 Figure 3 Model 4300EX Vibrating Wire Sressmeter Sensitivuty Factor VS Rock Modulus Figure 4 Model 4300BX Vibrating Wire Sressmeter Sensitivuty Factor VS Rock Modulus ...

Страница 15: ...environments corrections are not normally applied However corrections can be made and transducers can be equipped with thermistors for temperature measurement The temperature correction factor for the gage is 2 readout box units C indicating as apparent decrease in rock stress for a temperature rise Stress correction for temperature is σT R1 R0 G T1 T0 2G where σT the stress change corrected for t...

Страница 16: ...es etc 6 Trouble Shooting ________________________________________________ Maintenance and trouble shooting of vibrating wire stressmeters is confined to periodic checks of cable connections and maintenance of terminals The transducers themselves are sealed and cannot be opened for inspection The setting rods should be kept clean and the button mechanisms kept lightly oiled If a unit fails to read...

Страница 17: ... 88 46K 38 8851 2 1475 42 353 4 82 110 8 122 82 87K 37 8417 3 1418 43 342 2 83 107 9 123 77 66K 36 8006 4 1363 44 331 5 84 105 2 124 72 81K 35 7618 5 1310 45 321 2 85 102 5 125 68 30K 34 7252 6 1260 46 311 3 86 99 9 126 64 09K 33 6905 7 1212 47 301 7 87 97 3 127 60 17K 32 6576 8 1167 48 292 4 88 94 9 128 56 51K 31 6265 9 1123 49 283 5 89 92 5 129 53 10K 30 5971 10 1081 50 274 9 90 90 2 130 49 91K ...

Страница 18: ...he term d Er can be replaced by one reflecting the relationship between the rock modulus and the gage modulus Hast 1958 has shown this to be applicable for a uniaxial stressmeter For the measurement of stress σR in any direction θ the following applies σR 1 3 σ1 σ2 2 3 σ1 σ2 cos 2 θ θ measured counterclockwise from σ1 Using this relationship and three uniaxial stress change measurements at 45 to e...

Страница 19: ... psi Gage 3 σ90 300 psi Calculate the values for constants a and b a σ0 σ90 2 600 300 2 450 b σ45 a 2 σ0 a 2 1 2 800 450 2 600 450 2 1 2 380 79 σ1 3 2a 3 4b 3 x 450 2 3 x 380 79 4 960 59 psi σ2 3 2a 3 4b 3 x 450 2 3 x 380 79 4 389 41 psi sin 2θ 0 92 θ 33 40 σ1 Direction since σ45 a and σ0 σ90 then 135 θ 180 Therefore θ 180 33 40 146 6 This is measured clockwise from σ0 References _________________...

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