Technical Drawing - Exam Papers - Higher - 2001 - Building

Question 5

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On a contour map A and B are two points whose altitudes are 95 m and 75 m respectively. On the map B is located 115 m south-east of A. A skew bore-hole at A is drilled in a south-easterly direction in plan and has an actual inclination of 55° to the horizontal plane. It reveals the top and bottom surfaces of a stratum at distances of 15 m and 40 m, respectively, from A.

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 distances of 40 m and 65 m, respectively, from B.

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

(b) Another skew bore-hole at B is drilled in a south-easterly direction in plan and reaches the bottom surface of the stratum at an altitude of 15 m. Determine the length of this bore-hole as it passes through the stratum.

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