Reinforcement of residential masonry foundations to minimize damage due to mining-induced subsidence.
Proceedings of the International Land Reclamation and Mine Drainage Conference and Third International Conference on the Abatement of Acidic Drainage April 24-29, 1994, Pittsburgh, Pennsylvania. Pittsburgh, PA: United States Department of the Interior, Bureau of Mines, Special Publication SP 06C-94, 1994 Apr; 4:81-90
The differential movement of the ground during longwall mine subsidence may damage residential structures by overstressing their structural members and by tilting the structures to unacceptable levels. Three subsidence mitigation techniques are commonly practiced in the United States: trenching to alleviate ground pressure buildup on the foundation masonry walls, bracing to reinforce masonry foundation walls, and jacking the superstructure off its foundation to minimize damage due to bending and racking. Despite these precautionary measures, the foundations usually need expensive repair or replacement owing to structural failure or tilt. Information on subsidence upgrade of existing residential structures is sparse, and few subsidence upgrade-methods are laboratory and field tested. As a result, the U.S. Bureau of Mines is investigating methods of protecting and reinforcing existing residential masonry basement foundations to minimize longwall mining subsidence damage. This paper presents five full-scale in-plane bending tests that were conducted on a single, originally plain masonry wall. The purpose of the laboratory tests was to evaluate two post reinforcement designs that were proposed for existing residential foundations. The laboratory tests showed that the combination vertical and horizontal posttensioned tendons significantly increased the resistance of the masonry wall to in-plane bending.
Mining industry; Underground mines; Underground mining; Abandoned mines
Proceedings of the International Land Reclamation and Mine Drainage Conference and Third International Conference on the Abatement of Acidic Drainage April 24-29, 1994, Pittsburgh, Pennsylvania