Based on the big-span metro tunnels, the thesis primarily studies the mechanical characteristic, the stability and the construction methods about the big-span tunnels.
本文以大跨度地铁隧道为对象，研究了大跨度隧道结构的力学特性、稳定性和施工方法。
The big span GFRP roof cover is a new application of the GFRP structure parts in the construction.
大跨度玻璃钢屋盖是玻璃钢结构件应用于建筑工程的新领域。
The results show that some terms such as the importance of the engineering, geology and hydrologic conditions have critical role to employ which construction method in big span tunnel;
大跨隧道所处工程地质和水文地质条件；施工安全等对施工方法的选择具有决定性的影响；
These have certain guiding significance for the construction of big span goring advance in highway, railway, city transform and already have lines.
对公路、铁路、城市改造、既有线大跨径顶进施工有一定指导意义。
The adoption of reinforced concrete stiffened-beams and stiffened-columns has been the effective measure for construction of a big span structure.
采用劲性混凝土梁柱，是建造大跨度结构的有效措施。
The adoption of reinforced concrete stiffened-beams and stiffened-columns has been the effective measure for construction of a big span structure.
采用劲性混凝土梁柱，是建造大跨度结构的有效措施。
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