Technical Drawing - Exam Papers - Higher - 2008 - Building

Question 5

(a) On a contour map, A and B are two points with altitudes of 120m and 115m respectively.

On the map, B is located 130m east of A. A skew bore-hole at A is drilled in a south-easterly direction in plan and has an actual inclination of 50° to the horizontal plane.

It reveals the top and bottom surfaces of a stratum at altitudes of 80m and 65m, respectively.

A skew bore-hole at B is drilled in a north-westerly direction in plan and has an actual inclination of 65° to the horizontal plane. It reveals the top and bottom surfaces of the stratum at altitudes of 100m and 35m, respectively.

Determine the dip, strike and thickness of the stratum.

(b) On another map, R and S are two points with altitudes of 95m and 110m respectively.

On the map S is located 110m south-east of R. A vertical bore-hole is drilled at S and it reaches the top surface of a stratum at an altitude of 85m. A bore-hole at R is drilled in a south-easterly direction in plan and has an actual inclination of 60° to the horizontal plane. The stratum has a strike of north 75° west, a thickness of 25m and a dip of 40° in a general north-easterly direction.

Determine the distance from R to the bottom surface of the stratum along the bore-hole at R and find the inclination of this bore-hole to the stratum.

Scale 1 : 1000