(1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area，Ministry of Education，China Three Gorges University，
Yichang，Hubei 443002，China；2. Engineering Research Center of Rock and Soil Drilling and Excavation and Protection of Ministry of Education，China University of Geosciences，Wuhan，Hubei 430074，China；3. China Railway 14th Construction Bureau Group Co.，Ltd.，Jinan，Shandong 250014，China)
Abstract：With respect to the collapse of Youfangping tunnel crossing fault at Changsha to Kunming Section in Shanghai to Kunming High-speed railway of China，the macroscopical history of the tunnel deformation was summarized，and the influencing factors of the collapse in water-rich soft rock tunnel crossing fault and the surrounding rock failure mode were analyzed. The treatment measures were proposed. The results showed that the synergistic effect of geological structure and groundwater had the most significant influence on the tunnel collapse，and to some extent，the atmospheric precipitation promoted the tunnel collapse. The impact of construction methods and supporting measures on the tunnel collapse reflected the insufficiency of knowledge. It was a combination of multiple factors that contributed to the tunnel collapse. The surrounding rock failure mode of water-rich soft rock tunnel crossing fault was concluded as the synergistic failure mode of flexural deformation and bedding slippage. Based on the analysis of tunnel collapse mechanism，the comprehensive treatment measures inside and outside tunnel were proposed to prevent the occurrence of collapse effectively.
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2016, Vol. 35 
