Geokon Stressmeter 4300 Series Скачать руководство пользователя страница 3

 

 

 

Warranty Statement 

Geokon, Inc. warrants its products to be free of defects in materials and workmanship, under normal use and 

service for a period of 13 months from date of purchase. If the unit should malfunction, it must be returned to the 

factory for evaluation, freight prepaid. Upon examination by Geokon, if the unit is found to be defective, it will 

be repaired or replaced at no charge. However, the WARRANTY is VOID if the unit shows evidence of having 

been tampered with or shows evidence of being damaged as a result of excessive corrosion or current, heat, 

moisture or vibration, improper specification, misapplication, misuse or other operating conditions outside of 

Geokon's control. Components which wear or which are damaged by misuse are not warranted. This includes 

fuses and batteries. 

Geokon manufactures scientific instruments whose misuse is potentially dangerous. The instruments are intended 

to be installed and used only by qualified personnel. There 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 the installation or use of the product. The buyer's sole remedy for any breach of this agreement by 

Geokon, Inc. or any breach of any warranty by Geokon, Inc. shall not exceed the purchase price paid by the 

purchaser to Geokon, Inc. for the unit or units, or equipment directly affected by such breach. Under no 

circumstances will Geokon reimburse the claimant for loss incurred in removing and/or reinstalling equipment. 

Every precaution for accuracy has been taken in the preparation of manuals and/or software, however, 

Geokon, Inc. neither assumes responsibility for any omissions or errors that may appear nor assumes 

liability for any damages or losses that result from the use of the products in accordance with the 

information contained in the manual or software. 

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 ...

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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...

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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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