Table Of Contents - Geokon 4820 Instruction Manual

1. INTRODUCTION ................................................................................................................................................... 1
1.1 T O
HEORY OF PERATION
1.2 E P
ARTH RESSURE
1.3 E P
ARTH RESSURE
1.3.1 Model 4800 Earth Pressure Cells ............................................................................................................... 4
1.3.2 Model 4810 Contact ("Fat Back") Pressure Cell ........................................................................................ 5
1.3.3 Model 4815 Hydraulic Load Cell ............................................................................................................... 5
1.3.4 Model 4820 Earth Pressure "Jackout" Cell ................................................................................................ 6
1.3.5 Model 4830 Push-In Pressure Cell ............................................................................................................. 6
2. INSTALLATION .................................................................................................................................................... 7
2.1 P T
RELIMINARY ESTS
2.2 P C I
RESSURE ELL NSTALLATION
2.2.1 Installation of Model 4800 Earth Pressure Cells Inside Fills and Embankments ...................................... 7
2.2.2 Installation of Model 4810 Contact ("Fat Back") Pressure Cell .............................................................. 10
2.2.3 Installation of Model 4815 Hydraulic Load Cell ...................................................................................... 12
2.2.4 Installation of Model 4820 Jackout Pressure Cell in Slurry Trenches ..................................................... 13
2.2.5 Installation of Cells to Measure Earth Pressure at the Base of Footings, Floor Slabs, Pavements, Etc. . 14
2.2.6 Installation of Push-In Pressure Cells to Measure Lateral Earth Pressures ............................................ 15
2.3 C I
ABLE NSTALLATION AND
2.4 E N
LECTRICAL OISE
2.5 I R
NITIAL EADINGS
3. TAKING READINGS ........................................................................................................................................... 18
3.1 GK-404 R
EADOUT
3.1.1 Operating the GK-404 .............................................................................................................................. 18
3.2 GK-405 R
EADOUT
3.2.1 Connecting Sensors with 10-pin Bulkhead ................................................................................................ 19
3.2.2 Connecting Sensors with Bare Leads ........................................................................................................ 19
3.2.3 Operating the GK-405 .............................................................................................................................. 19
3.3 GK-403 R
EADOUT
3.3.1 Connecting Sensors with 10-pin Bulkhead ................................................................................................ 20
3.3.2 Connecting Sensors with Bare Leads ........................................................................................................ 20
3.3.3 Operating the GK-403 .............................................................................................................................. 20
3.4 M T
EASURING EMPERATURES
4. DATA REDUCTION ............................................................................................................................................ 22
4.1 P C
RESSURE ALCULATION
4.2 T C
EMPERATURE ORRECTION
4.3 B C
AROMETRIC ORRECTION
5. TROUBLESHOOTING ........................................................................................................................................ 25
APPENDIX A. SPECIFICATIONS ......................................................................................................................... 27
A.1 E P
ARTH RESSURE
A.2 S T
TANDARD EMPERATURE
APPENDIX B. THERMISTOR TEMPERATURE DERIVATION ..................................................................... 28
APPENDIX C. HIGH TEMPERATURE THERMISTOR LINEARIZATION .................................................. 29
APPENDIX D. TEMPERATURE EFFECT ON EARTH PRESSURE AND CONCRETE STRESS CELLS 30
D.1 F ........................................................................................................................................................ 30
ORMULAS
D.2 E ........................................................................................................................................................ 33
XAMPLES
APPENDIX E. NON LINEARITY AND THE USE OF A SECOND ORDER POLYNOMIAL TO IMPROVE
THE ACCURACY OF THE CALCULATED PRESSURE .................................................................................. 35

TABLE of CONTENTS

....................................................................................................................................... 1
C D .......................................................................................................................... 3
ELL ESIGN
C C ............................................................................................................. 4
ELL ONSTRUCTION
............................................................................................................................................ 7
........................................................................................................................... 7
S ................................................................................................................ 16
PLICING
............................................................................................................................................ 17
............................................................................................................................................. 17
B ..................................................................................................................................... 18
OX
B ..................................................................................................................................... 19
OX
B (O M
OX BSOLETE ODEL
............................................................................................................................. 21
.................................................................................................................................. 22
............................................................................................................................. 23
............................................................................................................................... 23
C .................................................................................................................................. 27
ELLS
T .......................................................................................................... 27
HERMISTOR
) .................................................................................................... 20