Archive image from page 286 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 PROBLEMS 275 Set off from A a line at the hole bearing N. 50°E. and on it the dip angle of the hole, , 60 deg., setting off on the dip line A Ax = 1,200 ft. the borehole length. Drop a per- pendicular A1A2 to meet the direction line from A in A 2, and Ao will be the plan position of the end of the borehole from A. In a similar manner, using the relevant data, get B2 . Fig. 184.—The three slanting borehole problem. and Ci. AoBoCi is the actual area enc
Archive image from page 286 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 PROBLEMS 275 Set off from A a line at the hole bearing N. 50°E. and on it the dip angle of the hole, , 60 deg., setting off on the dip line A Ax = 1,200 ft. the borehole length. Drop a per- pendicular A1A2 to meet the direction line from A in A 2, and Ao will be the plan position of the end of the borehole from A. In a similar manner, using the relevant data, get B2 . Fig. 184.—The three slanting borehole problem. and Ci. AoBoCi is the actual area encompassed by the bore- hole bases. On line A2C2 set off the depths of A2 and C2 at these points, respectively, at right angles to this line, so getting As and C3. Join A3 to C3 and produce to meet A2C2 produced in x. (Note that A2A3 is the depth of A2 and 523 is that of Bo and C2C3 that of C2.) Similarly set off AoA, the depth of A2, and B2B3, the depth of B2, at right angles to 22 as shown. Connect A'3 to B3 and produce to meet A2B2 produced in y. x and y are on the strike of the stratum. Drop a perpendicular C2D on to the strike line xy and erect one, C2E, at C2 equal to its depth. Join ED and the angle EDC2 is the amount of dip and its direction is DCo. Check by B2 GF using the same reasoning.
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