Geokon LVRA1230B, Instruction Manual

Page: 13 / 17

5
R
0
Ref
= Initial Reading Reference Chamber
R
1
Ref
= Current Reading Reference Chamber
G
Ref
= Calibration Factor Reference Chamber
Note: Negative values of
∆
EL
x
indicate settlement. (Positive values of
∆
EL
x
indicated heave).
Example: The initial readings on a 4 chamber system (3 active and reference chamber) are as follows:
Chamber Reading Calibration Factor
1 (Ref) 7163 0.002852
2 7858 0.002856
3 7967 0.002808
4 8028 0.002852
Subsequent readings on the chambers are as follows:
Chamber Reading
1 (Ref) 7118
2 7813
3 8628
4 7637
The changes in elevation of Chambers 2, 3 and 4 are:
a) Chamber No. 2:
∆
EL
2
= (R
1
2
– R
0
2
) G
2
– (R
1
1
– R
0
1
) G
1
= (7813 – 7858) 0.002856 – (7118 – 7163) 0.002852
= – 0.1285 – (– 0.1283)
= – 0.0002
″
( No Movement)
b) Chamber No. 3:
∆
EL
3
= (R
1
3
– R
0
3
) G
3
– (R
1
1
– R
0
1
) G
1
= (8628 – 7967) 0.002808 – (7118 – 7163) 0.002852
= 1.8561 – (– 0.1283)
= 1.9843
″
( Heave)
c) Chamber No. 4:
∆
EL
4
= (R
1
4
– R
0
4
) G
4
– (R
1
1
– R
0
1
) G
1
= (7637 – 8028) 0.002852 – (7118 – 7163) 0.002852
= – 1.1151 – (– 0.1283)
= – 0.9868
″
( Settlement)