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；

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At the same time, the stability of big-span tunnel with influence factor such as section size, high-span ratio and depth is studied.

同时，论述了大跨度隧道的稳定性以及断面尺寸、扁平率和隧道埋深对稳定性的影响。

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In excavation of double span tunnel, there exists a big water-eroded groove. The method of elastic foundation beam is used to cope with the situation.

双跨隧道在岩溶地区施工中遇到大型溶槽，采用弹性地基梁法成功跨越。

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