A coal mine is using the room and pillar method, block version with rooms and crosscuts 20ft in width driven on 90ft centers. Entries are entry crosscuts are the same dimensions. If no barrier pillars are left, compute the percentage recovery with and without pillar extraction

A coal mine is using the room and pillar method, block version with rooms and crosscuts 20ft in width driven on 90ft centers. Entries are entry crosscuts are the same dimensions. If no barrier pillars are left, compute the percentage recovery with and without pillar extraction

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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