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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 6    June 2018

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Ground stability of underground gateroad with 1 km burial depth:A case study from Xingdong coal mine, China
ZHANG Guang-chao(张广超)1, HE Fu-lian(何富连)2, LAI Yong-hui(来永辉)2, JIA Hong-guo(贾红果)1

1. College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China; 2. College of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Abstract:This paper presents an integrated investigation of the ground stability of a deep gateroad with a 1 km burial depth based on a field test, case studies, and numerical modelling. In situ stress measurements and mechanical properties tests were first conducted in the test site. Then, the deformation behavior, stress and yield zone distributions, as well as the bolts load of the gateroad, were simulated using FLAC3D software. The model results demonstrated that the soft rock properties and high in situ stress were the main factors for the deep gateroad instability, and the shear slip failure induced by the high stress was the primary failure model for the deep rock mass. In addition, the unsuitable support patterns, especially the relatively short bolts/cables with low pre-tensions, the lack of high-strengthen secondary supports and the unsupported floor strata, also contributed to the gateroad instability. Subsequently, a new combined supporting strategy, incorporating longer bolts/cables, yielding ring supports, and grouting measures, was proposed for the deep gateroad, and its validity was verified via field monitoring. All these could be a reference for understanding the failure mechanism of the gateroad with 1 km burial depth.

 

Key words: deep coal mine; soft rock; burial depth; failure mechanism; deformation behavior; support strategy

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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