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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 8    August 2018

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Conventional triaxial compression on hollow cylinders of sandstone with various fillings: Relationship of surrounding rock with support
WU Qiu-hong(吴秋红)1, 2, 3, LI Xi-bing(李夕兵)1, TAO Ming(陶明)1,ZHAO Fu-jun(赵伏军)4, WENG Lei(翁磊)5, DONG Long-jun(董陇军)1

1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
2. Work Safety Key Laboratory on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan University of Science and Technology, Xiangtan 411201, China;
3. Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology, Xiangtan 411201, China;
4. School of Resources, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
5. School of Civil Engineering, Wuhan University, Wuhan 430072, China

Abstract:The interaction of surrounding rock with a support system in deep underground tunnels has attracted extensive interest from researchers. However, the effect of high axial stress on tunnel stability has not been fully considered. In this study, compression tests with and without confining pressure were conducted on solid specimens and hollow cylinder specimens filled with aluminium, lead, and polymethyl methacrylate (PMMA) to investigate the strength, deformation and failure characteristics of circular roadways subjected to high axial stress. The influence of the three-dimensional stress on the surrounding rock supported with different stiffness was studied. The results indicate that the strength and peak strain of hollow cylinders filled with PMMA are higher than those of hollow cylinders filled with aluminium or lead, indicating that flexible retaining is beneficial for roadway stability. The results obtained in this paper can contribute to better understanding the support failure of a buried roadway subjected to high axial stress and thus to analyzing and evaluating roadway stability.

 

Key words: mechanical properties; hollow cylinder; flexible retaining; axial stress; support stiffness

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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