Effect of Tunnel Shape and Support System on Stability of a Tunnel in a Deep Coal Mine in China |
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| Authors: | Zhengxing Yu Pinnaduwa H S W Kulatilake Fuxing Jiang |
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| Institution: | (1) School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing, China;(2) Geological Engineering Program, Department of Materials Science and Engineering, University of Arizona, Tucson, AZ 85721, USA; |
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| Abstract: | Stability level of tunnels that exist in an underground mine has a great influence on the safety, production and economic
performance of the mine. Ensuring of stability for soft-rock tunnels is an important task for deep coal mines located in high
in situ stress conditions. The aim of this study is to investigate the effect of tunnel shape and support pattern on the deformation,
failure zone and stability around a tunnel located in a coal rock mass in China and to select an appropriate tunnel shape
and a support pattern to provide a stable stress-deformation condition around the tunnel. Using the available information
on stratigraphy, geological structures, in situ stress measurements and geo-mechanical properties of intact rock and discontinuity
interfaces, a three-dimensional numerical model was built using the FLAC software to simulate the stress conditions around
the tunnel in the coal rock mass. Analyses were conducted for several tunnel shapes and rock support patterns. Results obtained
for the distribution of failed zones, and stress and displacement fields around the tunnel were compared to select the best
tunnel shape and support pattern to achieve the optimum stability conditions. Also, a comparison is given between the numerical
predictions and field deformation monitoring results. |
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