MINE SUBSIDENCE CONTROL USING FOUNDATION GROUTING, SOUTHWESTERN PENNSYLVANIA

In 1976 surface movement of 1.5 feet resulted from mine subsidence and severely damaged two school buildings south of Pittsburgh, Pennsylvania. A stabilization project was undertaken to arrest the subsidence so that reconstruction of the buildings could be accomplished. A detailed program of exploration and design was completed using core borings, borehole television, joint and fracture studies and rock mechanics analysis. From these studies, a stablisization design using powerplant flyash to fill the mine are and a modified foundation grouting program for the rock above the mine was developed. This project was the first time that this design concept, using a modified foundation grouting procedure, was used by the Pennsylvania Department of Environmental Resources for a mine subsidence stabilization project. A detailed post-construction analysis program was undertaken, including the installation and monitoring of several multiple point rod extensometers. The analysis indicated that the risk of future subsidence and surface settlement has been reduced to an acceptable level for redesign and reconstruction of the schools. (Author)

• Supplemental Notes:
  • Proceedings of the Eighteenth Annual Engineering Geology and Soils Engineering Symposium, held at the Red Lion Inn, Boise, Idaho.
• Corporate Authors:

  Idaho Transportation Department

  3311 W State Street, P. O. Box 7129
  Boise, ID  United States  83707-1129

  University of Idaho, Moscow

  Department of Geology and Geological Engineering
  Moscow, ID  United States  83844-3025

  Boise State University

  Department of Geology and Geophysics
  Boise, ID  United States 

  Idaho State University, Pocatello

  Department of Geology
  Pocatello, ID  United States  83201

  Idaho State University, Pocatello

  Department of Geology
  Pocatello, ID  United States  83201
• Authors:
  • Branthoover, G L
  • Richards, J W
• Conference:
  • Proceedings of the Eighteenth Annual Engineeing Geology and Soils Engineering Symposium, held at the Red Lion Inn, Boise, Idaho.
• Publication Date: 1980-4

Media Info

• Features: Figures; References;
• Pagination: p. 323-337

Subject/Index Terms

• TRT Terms: Fly ash; Foundations; Grouting; Mines; Soil stabilization; Subsidence (Geology)
• Old TRIS Terms: Foundation grouting
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00334075
• Record Type: Publication
• Files: TRIS, STATEDOT
• Created Date: Sep 16 1981 12:00AM