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Abstract Research purposes:This papermainly studies the hazards ofdangerous rock and its potential falling around the Muchangzi1#Tunnnelportalwhere crosses the highway, and puts forward a reliable, safe and effective treatmentscheme for he purposes of construction ofMuchangzi1#Tunnnel on the second railway line from Xiangfan toChongqing.
Research conclusions:According to the geological and terrain conditions, the treatment scheme includes the following measures together: highway protection, slope reinforcemen,t optimizing abutment foundation, blasting control and elongating the length of tunnel shed. These measures can ensure the safety of traveling vehicle and passengers on the 210#nationalhighway, and eliminated the threat to the security of the railway operation in the future. So for the similar works, firstof al,l the careful survey should be done to define the relation between the locations ofhighway and the pier and the location of the tunnel porta,l highway grade and falling situation of dangerous rock, distribution of dangerous rock. If the rock above the highway is of reverse suspension, the section of suspending rock should surveyed carefully and the joint development level should be marked on the section. Then, the treatment scheme should guarantee the safety of vehicle and people on the highway. Finally, the impact of the rock falling on the railway traffic should be considered in the treatment scheme.
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2009, Vol. 26 
