Mining Safety and Health Research at NIOSH Reviews of Research Programs of the National Institute for Occupational Safety and Health (2007) / Chapter Skim
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13 Review of Ground Failure Prevention Research
13 Review of Ground Failure Prevention Research
Pages 156-172
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From page 156... ...
. STRATEgIC gOALS AND OBjECTIvES With a few exceptions, ground failure prevention research within the Mining Program is limited to the reaction of the perimeter of excavations in the earth's crust.
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From page 157... ...
The intermediate goals established for ground failure prevention research are forward looking and focused appropriately on emerging safety issues. REvIEW OF INPUTS Table 13-2 summarizes MSHA fatality statistics as a measure of relative frequency of accident types for coal and metal or nonmetal mining.
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From page 158... ...
Develop new ground control Ground control technologies are adopted Intermediate goal is too restrictive. Problems technology for mines with low-strength by the target mine population, resulting with weak roofs occur in mines other than those roofs in a 50% reduction in roof falls at these in the Illinois and northern Appalachian coal mines.
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From page 159... ...
Develop a sensor-based risk Sensor-based risk management system for Funding and time constraints within the management systems for roof falls in roof falls will be developed and used in 20% of industry may hinder sustained reduction of roof stone mines underground stone mines within 4 years fall accidents 7. Reduce injuries caused by rock bursts Developed ground control technologies are Mining companies are enthusiastically adopting adopted by 50% of the target mine population these technologies, resulting in substantial safety improvement.
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From page 160... ...
0 TABLE 13-2 Coal and Metal or Nonmetal Mining Fatalities Related to Ground Failure Percentage of All Mining Rib or Highwall Loose Rock Stockpile Total Related Roof Fall Face Fall Failure Highwall Slide Fatalities Fatalities year Coal M/NM Coal M/NM Coal M/NM Coal M/NM Coal M/NM Coal M/NM Coal M/NM 1997 5 2 3 1 0 2 0 0 0 0 30 61 27 8 1998 13 2 1 1 1 0 0 0 0 0 29 50 52 6 1999 10 3 3 2 3 2 0 0 0 0 34 53 47 13 2000 3 0 1 1 1 1 0 0 0 0 38 48 18 4 2001 9 4 2 0 0 0 0 0 0 0 42 30 26 13 2002 5 0 2 0 0 1 1 0 0 0 27 42 30 2 2003 2 0 1 0 0 0 0 0 0 0 28 26 11 0 2004 3 0 2 0 0 1 0 0 1 0 28 27 21 4 2005 9 0 0 0 0 0 0 0 0 0 22 35 41 0 Cum 59 11 15 5 5 7 1 0 1 0 278 372 29 6 NOTE: M/NM = metal and nonmetal. SOURCE: http://www.msha.go/fatals/fab.htm [accessed March 13, 2007]
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From page 161... ...
Identifying projects 2 and 10 on Table 13-3 as "complementary" to intermediate goals should not relegate them to a less important status than other projects. The committee considers the activities in ground failure prevention research to be highly relevant.
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From page 162... ...
Fragmentation Comple- Investigate blast patterns and rock High-priority area, but the Mining Activities are ongoing Methods mentary damage caused by blasting Program is not currently involved and likely to produce and Ground to overall in transfer activities improvements Control Safety strategic goal 3. Fundamental 6 Advancing understanding of ground falls High-priority area, and transfer Microseismic Studies of and development of monitoring systems activities have begun monitoring likely to Factors to detect the onset of instability result in improvements; Responsible for publications produced Falls of Ground 4.
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From page 163... ...
Reduction of 2, with Mine design criteria including rock mass Highly relevant to improving Design manual adopted Groundfall overlap in 1 ratings and span widths and the use of workplace protection; the Mining by mines in four states Hazards in and 4b fiber-reinforced shotcrete as a surface Program has engaged in transfer Nevada treatment to improve stability activities 9. Roof Fall 4b How roof supports perform in weak High priority in developing Hardware developed Evaluation and rock, how fracturing is induced by improved analytical design now being deployed Mediation in excavation, and how fracturing can be techniques for underground mines Weak Rocks arrested 10.
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From page 164... ...
bIntermediategoal 4 was developed specifically for the Illinois and northern Appalachian coal basin, but projects may have wider range of application.
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From page 165... ...
The Mining Program is to be complimented for encouraging and supporting travel to national meetings to present research results. According to the Mining Program Briefing Book, ground failure prevention research receives approximately 16 percent of the total program budget but has produced nearly 24 percent of the outputs.
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From page 166... ...
computer collapses program (2003) Promotion of roof fall forecasting Mitigating ground fall hazards 6 Project is ongoing; monitoring activities at more mine techniques in stone mining sector in underground stone mines sites than in past years; new mine layouts implemented at several sites Hardware and computer logic MRS for retreat room-and-pillar 4 Technology incorporated into MRS system design by a for Mobile Roof Support (MRS)
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From page 167... ...
PBS available through two roof support (2003) ; Make It Safer with Roof coal miners manufactures; more than 200 copies of the video Screen video (2004)
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From page 168... ...
• Reducing injuries by improving shotcrete design criteria. Developing a set of design criteria for application of shotcrete as a means of rock support is a continuation of current efforts and clearly fits intermediate goals 2 and possibly 4.
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From page 169... ...
No ground failure prevention intermediate goal is clearly related to this topic. • Roof span and pillar layout guidelines for stone mines.
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From page 170... ...
review of the USBM. Stakeholders generally praised the ground failure prevention research in the Mining Program.
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From page 171... ...
The intermediate outcomes have resulted in new knowledge, and the Mining Program is actively engaged in transfer of this knowledge to the mining industry and regulatory authorities. Consequently, the Mining Program ground failure prevention effort justifies a high rating for impact.
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From page 172... ...
PROgRESS IN TARgETINg NEW RESEARCH Ground failure prevention research is a heritage program, with future research needs identified primarily through concerns expressed by stakeholders and the prevalence of injuries caused by changing mining methods and geologic condi tions. The Mining Program has identified several research areas it is pursuing.
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