A mine orientation survey is to be done using two mechanical plumb-lines in one vertical shaft. The depth of the oriented level H = 300 m. The distance between the two plumb-lines is 4m. Steel wires of tensile strength 200 ??⁄??2 are available for plumbing. The height of the shaft opening to the oriented level h = 5m and the average air velocity in the cross section of the opening v = 1 m/s. There are no other openings to intermediate levels between the surface and the oriented level. What diameter (d) of the plumb wires and what weight (p) of the plumb bobs would you use for the orientation purpose? What error of the transferred azimuth would you expect as a result of the air current and spiral shape of the wires (take the radius of the spiral shape R = 15 cm and use values of d and p as obtained from part (a)).
A mine orientation survey is to be done using two mechanical plumb-lines in one vertical shaft. The depth of the oriented level H = 300 m. The distance between the two plumb-lines is 4m. Steel wires of tensile strength 200 ??⁄??2 are available for plumbing. The height of the shaft opening to the oriented level h = 5m and the average air velocity in the cross section of the opening v = 1 m/s. There are no other openings to intermediate levels between the surface and the oriented level. What diameter (d) of the plumb wires and what weight (p) of the plumb bobs would you use for the orientation purpose? What error of the transferred azimuth would you expect as a result of the air current and spiral shape of the wires (take the radius of the spiral shape R = 15 cm and use values of d and p as obtained from part (a)).
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A mine orientation
- What diameter (d) of the plumb wires and what weight (p) of the plumb bobs would you use for the orientation purpose?
- What error of the transferred azimuth would you expect as a result of the air current and spiral shape of the wires (take the radius of the spiral shape R = 15 cm and use values of d and p as obtained from part (a)).
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