Journal
ROCK MECHANICS AND ROCK ENGINEERING
Volume 48, Issue 6, Pages 2447-2458Publisher
SPRINGER WIEN
DOI: 10.1007/s00603-015-0713-2
Keywords
Heading adjacent advancing working face; Gob-side entry driving; Numerical simulation; Theoretical calculation; Failure criteria; Key technology
Funding
- Chinese National Programs for Fundamental Research and Development (973 Program) [2013CB227900]
- National Natural Science Foundation of China [51204166, 51174195]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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In mining excavation, the roof bending subsidence of gob-side entry driving heading adjacent to the advancing working face (HAWF) can be considerable. Influenced by the original rock pressure, the front and lateral abutment pressure of the adjacent working face, and the front abutment pressure of the current working face, the support body can easily fail, leading to serious instability of the rock mass surrounding the tunnel. To study the stress state and the deformation failure mechanism of the HAWF roof structure, we use on-site survey data, numerical simulation, and theoretical calculations to fit the spatial distribution law of mining abutment pressure piecewise, and establish a dynamic mechanical model of the roof structure. We then propose a roof failure criterion and examine the roof flexure deformation behavioral pattern. We found that the central part of the roof is the main point that controls the surrounding rock. To prevent the deformation and collapse of the roof and rock surrounding the tunnel, we propose techniques that can be applied to HAWF gob-side entry driving, including setting the coal pillar width, the driving stop and restart timing, and other control concepts.
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