Technical Graphics skewed bore holes?

spoonbadger · 08-02-2008 7:27pm #1

hi all,can anyone point in the direction of some online tech graphics notes, or help me with a wee problem?.im stuck on a bore holes problem. i can get the elevation/plan drawn out, and plot out the bore holes etc., but im stuck on trying to get the "dip,strike and thickness"

. does anyone have any suggestions? thanks for reading,

-spoon.

ZorbaTehZ · 08-02-2008 9:37pm

Dip refers to the bore hole's inclination to the horizontal plane, strike is the direction in which the stratum is pointed and thickness refers to the thickness of the stratum i.e. the thickness of the section that is between the upper and lower part of the bore holes.

Basically to find the Dip and Thickness, you're doing exactly as you would do in the part D of question 1 - the part where your asked to find the shortest distance/horizontal distance between 2 skew-lines. You need to look at the bore holes in an elevation view that shows the lines parallel (the method I used to use was just trying to draw in a triangle with one side being one of the bore holes, another side horizontal and the other parallel to the other borehole - if that makes sense

).

The thickness is the distance between the lines in this view (you may need to "extend" the lines out further so that you can find the true distance) and the dip is simply the inclination that the lines have with some line perpendicular to your projection lines for this view (i.e. the horizontal plane). The strike is then just the direction in which the stratum is pointed.

irish_boy90 · 09-02-2008 12:15am

did you do intersecting planes?
Question 1 paper 1

well i think of the Strike as the LOI
Finding the dip etc is really the same way you find the dihedral angle except you only do one elevation.

hope this helps, i hope this helps you, thinking like this every time i do a dip and strike makes it a fairly easy question for me.

Technical Graphics skewed bore holes?

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