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Author(s): |
Ying Xu, School of Civil Engineering and Architecture,Anhui University of Science and Technology, Huainan, Anhui, China
Yong Sun, School of Civil Engineering and Architecture,Anhui University of Science and Technology, Huainan, Anhui, China |
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Abstract: |
The stratum movement failed to be kept in control, the steel brackets were broken out of torsion, andeven the workers got covered up by the fallen roof when the advance support of pipe shed made of the regular steelbracket was utilized twice to tunnel through thick wind-blown sand stratum. Concrete line was unable to be poured, andconstruction was interrupted due to large roof collapse. To get over it, annular soil of upper bench is firstly excavated inshaft arch. The steel brackets are erected and the outer metal nets are suspended. Then the preliminary 100 mm thickconcrete is shot, and the roof is supported by over-length advance condulet canopy. The inner metal nets are suspended;another 200mm-thick shotcrete is done. The workface is sealed by grouting; the sand stratum is reinforced by conduletgrouting. The achievements of smooth tunneling provide valuable experiences for the similar project.
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