Study On Key Technology For Neighborhood Highway Tunnel By Similar Model Test

Due to complicated topographical and geological conditions as well as large numbers of mountainous areas in China, construction of high-grade highway unavoidably meet with lots of tunnel works. As a result of special geological and topographical limitations, spacing of tunnels can not satisfy with general technical code. Therefore, special structure shapes such as neighborhood tunnel, double-arch tunnel have to be applied. However, the double-arch tunnel has a really complex and long lasting construction process. It is weak in waterproof, but strong in investment need. From this point of view, the neighborhood tunnel, whose key technology on design and construction is becoming a hot researching item., advantages the double-arch tunnel. So this small spacing tunnel is widely used.Based on the neighborhood tunnel of Huang Qu Nan Expressway, this paper takes the indoor model test as the main means of research, associating with numerical simulation. By comparing and confirming of the two , it draws the conclusion. The main research work are as follows:(1) set net minimum reasonable distance of neighborhood tunnel in the rock class III～V, by the means of simulating tunnel excavation in different ground conditions ,distances, state support systems.(2)differentiate and define the middle rock pillar and its neighboring areas in tunnel. On this basis, through the model test of the V-class rock, study the effect of different reinforcing manner to set the reasonable reinforcement approaches in middle rock pillar.(3)Analyze the characteristics shown by experimental results of middle rock pillar,sum up its behaviors.(4)Compare,confirm and supplement the experimental results via two-dimensional numerical simulation.