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Geomechanics and Engineering
  Volume 14, Number 5, April10 2018, pages 429-437
DOI: http://dx.doi.org/10.12989/gae.2018.14.5.429
 


Optimal pre-conditioning and support designs of floor heave in deep roadways
Chunlai Wang, Guangyong Li, Ansen Gao, Feng Shi, Zhijiang Lu and Hui Lu

 
Abstract
    In order to reduce deformation of roadway floor heave in deep underground soft rockmass, four support design patterns were analyzed using the Fast Lagrangian Analysis of Continua (FLAC)3D, including the traditional bolting (Design 1), the bolting with the backbreak in floor (Design 2), the full anchorage bolting with the backbreak in floor (Design 3) and the full anchorage bolting with the bolt-grouting backbreak in floor (Design 4). Results show that the design pattern 4, the full anchorage bolting with the bolt-grouting backbreak in floor, was the best one to reduce the deformation and failure of the roadway, the floor deformation was reduced at 88.38% than the design 1, and these parameters, maximum vertical stress, maximum horizontal displacement and maximum horizontal stress, were greater than 1.69%, 5.96% and 9.97%. However, it was perfectly acceptable with the floor heave results. The optimized design pattern 4 provided a meaningful and reliable support for the roadway in deep underground coal mine.
 
Key Words
    numerical simulation; soft rock roadway; rock bolt supporting; roadway stability
 
Address
Chunlai Wang, Guangyong Li, Ansen Gao, Feng Shi, Zhijiang Lu and Hui Lu: 1.) Faculty of Resources & Safety Engineering, China University of Mining & Technology Beijing 100083, China
2.) Coal Industry Engineering Research Center of Top-coal Caving Mining, Beijing, 100083, China
 

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