Mine Surveying Assignment | Surveying
- Reduce the levels outlined in the table below using the collimation method, apply only the appropriate checks. Point I is a benchmark with a level of 56.174m above datum. Adjust the calculated levels so that the results at I agree with the specified level.
If the distance from A to H is 220m calculate the mean gradient between the two points. Outline the practical precautions that must be taken for accurate leveling.
|0.599||BM 58.031 m AOD|
- Book and reduce the following levels and carry out the required checks on the arithmetic. A pair of numbers indicates a change point, the first number being the backsight.
Staff reading (m)
1.263 Bench mark, level 26.294 m
3.279, 0.796 CP
0.376 Road level under bridge
1.627, 0.291 CP
-2.162 Soffit under bridge
1.582, 3.526 CP
2.14 BM, level 27.42 m
Could a truck 4.1-m high pass under the bridge?
- Complete the extract from the level book in the table below applying the usual arithmetic checks.
- A straight section of road XY is to be reconstructed such that it has a constant grade of 1 in 40, falling from X to Y. The level of the road at X is to remain unaltered. The levels detailed in the table below were recorded along the centre line of the existing road.
- Draw up and complete the level book for these readings applying the usual arithmetic checks.
- Determine the height of the underside of the bridge above the centre line level when the road has been reconstructed.
iii. Calculate the depth of fill or cut at Y when the road has been reconstructed.
|0.738||BM 112.309 above datum|
|1.713||30m from X|
|2.265||60m from X|
|1.100||90m from X|
|1.533||120m from X|
|-3.133||Inverted staff on underside of bridge
126.8 m from X
|1.634||150m from X|
|2.472||Point Y 170m from X|
|2.265||BM 107.895 above datum|
- Angles have been measured from an offshore station P sighting shore stations X, Y and Z whose grid coordinates are known. From the following data calculate the grid coordinates of P.
X (260853.2 m E, 376183.7 m N)
Y (260985.6m E, 376.812.3m N)
Z (260955.0m E, 377387.6m N)
X-P-Y = 38°41’
Y-P-Z = 23°16’
- The coordinates of two stations A and B are 434762.19m E, 376592.83m N and 435476.80m E, 377404.35m N respectively. At A and B clockwise angles BAC and ABC are measured as 44°29’35” and 313°32’43” respectively. Determine the coordinates of C.
- A and B are points on the centre line of a level mine roadway and C and D are points on the centre line of a lower roadway having a uniform gradient between C and D. It is proposed to connect the roadways by a drivage from point B on a bearing of 165°35’. Given the data in the table below:
|Point||Northing (m)||Easting (m)||RL (m)|
i)The actual length and gradient of the drivage, and
ii)The coordinates of the point at which it meets the lower roadway.
- Measurements of the traverse ABCDE, as shown in the figure below are given in the table below.
|Station||Clockwise Angle||Length (m)|
|A||260° 31’ 18”||
|B||123° 50’ 42”||
|C||233° 00’ 06”||
|D||158° 22’ 48”||
|E||283° 00’ 18”|
The measured angles are shown as in the figure. Keeping the bearings of XA and EY and also the coordinates of A and E fixed, obtain the adjusted coordinates for B, C and D.
- Three survey stations F, A and B have been set out in a line on steeply inclined ground. A target at B, 1.219m above the ground is sighted from the two instrument stations at A and F. The angles of elevation are 45°30’ from A and 30°20’ from F. The height of the instrument axis at A above the ground is 1.554m and at F 1.451m. The horizontal distance from A to F is 60.961m. A levelling staff is held at F, and a reading of 2.585m obtained from the instrument at A, the telescope being set to the horizontal.
Assuming station F to be at an RL of 24.384m above a datum level, calculate:
a)The horizontal distance from A to B, and
b)The reduced level of station B relative to the datum.
- An open traverse was run from A to E in order to obtain the length and bearing of the line AE which could not be measured directly, with the following results:
Find by calculation the required information.
- Describe the methods available for vertical transfer of coordinates from surface to underground.
- A, B, C and D are the stations of a four sided loop traverse; angles are measured with a Wild T1A and distances with a 50m steel band, the results are listed in the table below.
- i) Compute the traverse, and say whether you would consider the misclosure satisfactory.
- ii) If you consider the misclosure unsatisfactory, say where the bad observation responsible is most likely to have
iii)On the basis that your assumption is correct, obtain adjusted coordinates for B, C and D on the basis of:
Coordinates of A: 1000.0m E, 2000.0 m N
Bearing of AB = 30°