Technical Drawing - Exam Papers - Higher - 2000 - Building

Question 5

Full Scale PDF of Answer   

On a contour map A and B are two points whose altitudes are 90 m and 70 m respectively. On the map B is located 90 m north-east of A. A skew bore-hole at A is drilled in a north-westerly direction in plan and has an actual inclination of 60° to the horizontal plane. It reveals the top and bottom surfaces of a stratum at altitudes of
50 m and 20 m, respectively.

A skew bore-hole at B is drilled in a south-westerly direction in plan and has an actual inclination of 50° to the horizontal plane. It reveals the top and bottom surfaces of the stratum at altitudes of 70 m and 45 m, respectively.

(a) Determine the dip, strike and thickness of the stratum.

(b) Another skew bore-hole at A is drilled in a northerly direction in plan and has an actual inclination of 65° to the horizontal plane. Determine the true inclination of this bore-hole to the stratum.

Scale 1 : 1000

Show Full Answer