Certificate In Strata Control - Coal Exam Practice Questions - Certificate In Strata Control - Coal (South Africa) Exam

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Using Tributary Area Theory with an overburden gradient of 0.025 MPa/m, calculate the average vertical stress (load) on a square coal pillar at depth H = 80 m, with pillar width w = 12 m and bord width B = 6 m.

4.50 MPa 2.00 MPa 6.75 MPa 3.20 MPa

Correct Answer:

4.50 MPa

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