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Support Deformation Induced Clearance Invasion and Treatment for a Pelitic Soft-Rock Tunnel Passing through a Water-Rich Fault Zone
(1 Wuhan Surveying-Geotechnical Research Institute Co. Ltd. of MCC, Wuhan 430080; 2 School of Civil Engineering and Architecture, Wuhan University, Wuhan 430072)
Abstract Serious initial support deformation occurred when the exit of the Beilingshan tunnel on the NanningGuangzhou railway passed through a water-rich fault zone in pelitic soft rock, and a series of countermeasures were adopted at the site, but they failed. Regarding this situation, the whole evolution of the initial support induced clearance invasion and the macroscopic characteristics of tunnel were analyzed, then further analysis and research was carried out regarding the reasons and mechanism of clearance invasion for tunnels passing through water-rich fault zones in terms of unfavorable geology, the coupling cycle of underground water and mudstone, tunnel structure, original design and construction scheme based on the actual measured data. Comprehensive schemes for the inside tunnel and outside tunnel were proposed. By way of numerical simulation, a calculation regarding arch replacement was
carried out and the relative optimum parameters were obtained. With this treatment scheme, the exit end of the tunnel successfully passed through the water-rich fault zone, which provides a theoretical and practical references for similar tunnels regarding initial support deformation induced clearance invasion.
Abstract：
Serious initial support deformation occurred when the exit of the Beilingshan tunnel on the NanningGuangzhou railway passed through a water-rich fault zone in pelitic soft rock, and a series of countermeasures were adopted at the site, but they failed. Regarding this situation, the whole evolution of the initial support induced clearance invasion and the macroscopic characteristics of tunnel were analyzed, then further analysis and research was carried out regarding the reasons and mechanism of clearance invasion for tunnels passing through water-rich fault zones in terms of unfavorable geology, the coupling cycle of underground water and mudstone, tunnel structure, original design and construction scheme based on the actual measured data. Comprehensive schemes for the inside tunnel and outside tunnel were proposed. By way of numerical simulation, a calculation regarding arch replacement was
carried out and the relative optimum parameters were obtained. With this treatment scheme, the exit end of the tunnel successfully passed through the water-rich fault zone, which provides a theoretical and practical references for similar tunnels regarding initial support deformation induced clearance invasion.
.Support Deformation Induced Clearance Invasion and Treatment for a Pelitic Soft-Rock Tunnel Passing through a Water-Rich Fault Zone[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(3): 181-189
2017, Vol. 54 