分析了荷载比例、矢跨比、垂跨比和抗力类变量的变异系数对结构可靠性能的影响。

The influences of the load combination ratio, rise-span ratio, sag-span ratio and resistant variable variance on the reliable performance are discussed.

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置换率是桩体承担荷载比例大小的主要因素，提高桩体承载比例的主要途径是提高桩的置换率，增大桩帽面积。

The replacement ratio is the main factor for the increase of proportion of pile bearing load, and the main way is to raise the replacement ratio of piles and the size of the pile cap.

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二次衬砌所受荷载大小与其施筑时间有很大的关系，在设计和施工中要合理掌握二次衬砌所承担的荷载比例和以及施筑时间。

The magnitude of the load was affected by the construction duration. It is necessary to know the distribution of load and the construction duration when we design and construct such tunnels.

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