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| Research on the Force Exerting Mode Model Test of Tunnel - Landslide Orthogonal System |
| WU Hong - gang1，CHEN Xiao - yun2，AI Hui3 |
| (1. Northwest Research Institute Co. Ltd of CREC，Lanzhou， Gansu 730000， China; 2. China Academy of Railway Sciences，Beijing 100081，China; 3. Lanzhou Jiaotong University，Lanzhou，Gansu 730070，China) |
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Abstract Research purposes ： With the rapid development of Chinese high - speed railway in recent years，especially in the west of the complex terrain，the total length of the tunnel has accounted for a growing share of the railway line， leading to that lots of tunnel must pass through the landslide，which may cause a serious threat for the construction and operation of the tunnel. At present，it did not form a unified understanding and standards for the design and construction of tunnel in our country，and also there is no complete calculation theory. Focusing on the tunnel - landslide orthogonal system in this paper，three loading conditions are simulated by three sets of model tests，which the tunnel are in the above of the sliding surface，across the sliding surface and under the sliding surface，the sliding mass is forced to slide by loading on the rear of landslide and excavating the toe of landslide，the stress of tunnel is monitored and researched by tiny earth pressure cell around the tunnel. Research conclusions ：( 1) The pressure around the tunnel is increasing with the loading and excavation，and it has a gradually stable trend. (2) The pressure of tunnel near the mountain is significantly greater than that near the river in the first model test，and the same can be said in the second model test，but the pressure in the same position is smaller than that in the first，the pressure near the mountain is similar with that near the river in the third model test. (3) The pressure on the top of tunnel tends to drop from the site of mountain to the river，which is opposite at the bottom of the tunnel，and they all have a trapezoidal shape. (4) The research results can provide references for the design and construction of railway tunnel which pases through the areas of landslide.
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Received: 21 July 2015
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2016, Vol. 33 
