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Stability analysis of a backfilled room-and-pillar mine

Author: D R Tesarik
Publisher: [Washington, D.C.?] : U.S. Dept. of the Interior, Bureau of Mines, 1995.
Series: Report of investigations (United States. Bureau of Mines), 9565.
Edition/Format:   Book   Microform : National government publication : Microfiche : EnglishView all editions and formats
Summary:
Displacement and stress changes in cemented backfill and ore pillars at the Buick Mine, near Boss, MO, were monitored by engineers from the U.S. Bureau of Mines and The Doe Run Co., St Louis, MO. A test area in this room-and-pillar mine was backfilled to provide support when remnant ore pillars were mined. Objectives of this research were to evaluate the effect of backfill on mine stability, observe backfill
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Details

Material Type: Government publication, National government publication, Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: D R Tesarik
OCLC Number: 33631979
Notes: Distributed to depository libraries in microfiche.
Shipping list no.: 95-0753-M.
Reproduction Notes: Microfiche. [Washington, D.C.?] : Supt. of Docs., U.S. G.P.O., [1995]. 1 microfiche : negative.
Description: 20 pages : illustrations ; 28 cm.
Series Title: Report of investigations (United States. Bureau of Mines), 9565.
Responsibility: by D.R. Tesarik [and others].

Abstract:

Displacement and stress changes in cemented backfill and ore pillars at the Buick Mine, near Boss, MO, were monitored by engineers from the U.S. Bureau of Mines and The Doe Run Co., St Louis, MO. A test area in this room-and-pillar mine was backfilled to provide support when remnant ore pillars were mined. Objectives of this research were to evaluate the effect of backfill on mine stability, observe backfill conditions during pillar removal, and calibrate a numeric model to be used to design other areas of the mine.

Relative vertical displacements in the backfill were measured with embedment strain gauges and vertical extensometers. Other types of instruments used were earth pressure cells (to identify loading trends in the backfill), borehole extensometers (to measure relative displacement changes in the mine roof and support pillars), and biaxial stressmeters (to measure stress changes in several support pillars and abutments).

Two- and three-dimensional numeric codes were used to model the study area. With information from these codes and the installed instruments, two failed pillars were identified and rock mass properties were estimated.

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