Abstract：Research purposes: Collapse and rockfall are the most common geological disasters for the steep rock slope．If the they are not treated in time，they may cause the traffic interruption，huge economic loss and life casualty． When railway is built in mountain area，the open tunnel and hangar tunnel are adopted to prevent the impact of the collapse and falling stone on the track structure，especially to prevent the collapse and falling stone in exit and entrance of the tunnel． The impulsive force of falling stone is one of main load indexes to be considered in design of the preventive structure，such as open tunnel，hangar tunnel and stone retaining wall． Now the impulsive force of falling stone is often computed with the semi － experience and semi － theory formula，but the applicability and the rationality of them should be verified before application．
Research conclusions: In this paper，the analysis and discussion were made on the commonly － used calculation methods for the impulsive force of falling stone． The calculation of the impulsive force of falling stone was made for the additional hangar tunnel at the tunnel portal of Xiangfan － Chongqing Railway with the subgrade technical manuals method，tunnel technical manuals method，Labiouse method，Kawahara method and Yangqixin method． It was shown that the calculation results obtained by these five methods were almost the same in magnitude． The results obtained by the subgrade technical manuals method and tunnel technical manuals method were a little bigger than the others．However，on consideration of that these two methods had been applied and verified in a large number projects，it was proposed to use the calculation results obtained by these two methods as the design load of the additional hangar tunnel and based on them to make the design．
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2012, Vol. 29 
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