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| Research on the Rockfall Protection Structure for Junction Area between Bridge and Tunnel in the Changsha - Kunming Railway Line |
| LUO Ren-li，LI Ya-jun |
| (China Railway Eryuan Engineering Group Co. Ltd，Chengdu，Sichuan 610031，China) |
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Abstract Research purposes ： In the later construction period of the Changslia - Kunming Railway Line，some working points need rockfall protection structures which are located at junction area between bridge and tunnel，the construction disturbance is serious，and the schedule is very tight. According to these factors，through analysis and comparison of the open - cut tunnel scheme，the transverse frame scheme and the longitudinal frame scheme from applicable condition and structure internal force，the better design schemes are confirmed for different conditions. Research conclusions：( 1 ) When design the rockfall protection structure， the field condition and the construction disturbance should be fully considered. (2) When there is mound plate trolley，the open - cut tunnel scheme is the first priority. (3) Because of the construction disturbance and the bigger internal force，transverse frame scheme should not be adopted in the later construction period. (4) The longitudinal frame scheme can avoid the construction disturbance， if the precast and hoisting condition is allowed，T beam is better to be used as the cross beam，otherwise，hollow slab beam is better. (5 ) This research result could provide a reference for type selection of rockfall protection structure in similar situation.
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Received: 18 November 2015
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2016, Vol. 33 
