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| Deformation Experiment Research on the Model Tunnel Anchorage of Dadu River Bridge in Luding |
| WEN Li - na1，CHENG Qian - gong1，CHENG Qiang2，GUO Xi - feng3 |
| (1. Southwest Jiaotong University，Chengdu， Sichuan 610031，China; 2. Sichuan Provincial Transport Department Highway Planning Survey，Design and Research Institute，Chengdu，Sichuan 610041，China;3. Yangtze River Scientific Research Institute，Wuhan，Hubei 430010，China) |
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Abstract Abstract ： Research purposes ： This paper presents the deformation test of the model tunnel anchorage of Dudu river bridge in Luding，which is a part of tlie highway from Yaan to Kangding. The deformation test want to obtain the design paramaters and deflection of the anchorage of the bridge. The scale of the model anchorage is 1 : 10. It is near the bridge tunnel anchorage. The deformation test included the surface deformation monitoring， the deep rockmass deformation monitoring，the deformation of tlie anchorage and surrounding rock interface dislocation monitoring and the strain of tlie anchorage，the deformation characteristics of tunnel anchorage in 1!，3. 5! and IP loads were analyzed. Research conclusions:( 1 ) Test results show that under the 1P，3. 5P and IP loads， the average deformation of anchorage body is 0. 40 mm，2. 19 mm and 5. 81 mm. ( 2 ) The average deformation of surrounding rock deformation (tensile direction and vertical direction) is less than 0. 25 mm，0. 21 ?1.86 mm，-0. 42 ?6. 59 mm. (3 )The maximum displacement between the anchor body and surrounding rock is 0. 12 mm，0. 32 mm，0. 77 mm. (4 ) But the instantaneous deformation of the anchorage and the surrounding rock are more apparent，so in the bridge design ，the deformation of tunnel anchorage and surrounding rock and the surrounding rock stability should be fully considered. (5 ) The results can not only provide the necessary technical parameters and support for bridge design but also provide technical reference for similar projects.
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Received: 17 November 2016
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2017, Vol. 34 
