1-1 of 1
Keywords: portal
Close
Sort by
Proceedings Papers

Paper presented at the ISRM Progressive Rock Failure Conference, June 5–9, 2017
Paper Number: ISRM-PRF-2017-021
... 1 Introduction During the construction of three new entrances (portals) and inclined roadways (drifts) for an existing coal mine the face and roof of one drift collapsed, resulting in approximately 100 m 3 of material within the roadway and piping extending to the slope in the hillside above...

Product(s) added to cart

Close Modal