%A Chunguo WANG %T Study on full face hard rock tunnel boring machine through the overpass in composite stratum %0 Journal Article %D 2021 %J Journal of Shandong University(Engineering Science) %R 10.6040/j.issn.1672-3961.0.2020.525 %P 45-51 %V 51 %N 3 %U {http://gxbwk.njournal.sdu.edu.cn/CN/abstract/article_2037.shtml} %8 2021-06-20 %X

By using the numerical calculation method, the double tunnel underpass overpass was established according to the actual engineering situation, the strain law of the tunnel underpass municipal bridge was comprehensively analyzed, the multi-point displacement of the bridge was monitored, and the weak point reinforcement measures of the tunnel orthogonal underpass bridge were proposed. The results showed that the influence of the two-way simultaneous excavation of the right tunnel was almost the same as that of the two-way simultaneous excavation of the right tunnel. The left tunnel was excavated first and then the right tunnel was excavated. The uplift part of the bridge deck would gradually subside with the excavation of the right tunnel. It could be seen that the left tunnel excavation first and then the right tunnel excavation had the largest impact on the bridge deck, which was easy to cause the uneven settlement of the bridge. The uneven settlement of bridge deck caused by tunnel excavation could temporarily support and reinforce the piers, and the circumferential soil around the piers could be replaced with concrete to reduce the settlement of the piers and bridge deck.