| Mining in Appalachia in particular, often presents issues where valleys must be crossed underground to gain access to reserves. Often this means that a number of surface features existing in the valley must be protected from the possibility of undermining in close proximity, causing damage. Additionally, the safety of the workforce and integrity of entries underground must be assured. Surface features may include the following: Buildings, Roads, Rivers, Railroads, Sewers and Utilities.
Sub-Technical has developed methods and materials to ensure successful grouting, which incorporate ground anchoring members that also act to support and distribute loading.
In a recent project by working in advance of the mining cycle three entries were taken under an active railroad, a busy two lane road and a river. The minimum cover was 25 feet in mixed shales. The net result at the surface was that there was no disruption or damage to road, rail or stream. Underground, the three entries progressed rapidly through the area with out any problems of ground control or water inundation whatsoever. |
