Question

2. A 200-ft high slope in a quarry is to be developed with a dip angle a-60°. A join angle ?-34°, is dipping in the same direction as the slope. The pro perties of the joint are: average rock density 160 Ibs/ft internal frictional angle of joints cohesion of joints 1440 psf 31° is a tension crack on the upper surface of the slope 120 ft from the crest and filled e is to be carried out to increase the slope stability, to what level must the water has to If there with 40 ft of water from the bottom of the crack, calculate the safety factor of the slope. It drainag voedowain order for the slope to achieve a safety factior of 1.10? YOU MUST SHOW YOUR WORK.

Answer 1

When a tension crack is >resen Factor of i% aiven by /he eqcia tton bu the eaa tin Safe I5 .hhe re - 284. 02& ft2 冫 44420

2 ho here

是00 = a9 11315.864

Fo-5-144012ew.ooe+((24 1315444.* 99 20'燗
Answer to the second part can be found by keeping b as such in the equations and solving.