The term "very high span losses" is defined herein to mean span losses that are greater than or equal to 30 dB.
术语“很高的段损耗”在这里被定义成指大于或等于30dB的段损耗。
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。
In this paper, by the model test, authors study some design of support structure system with three-lane road tunnel of small-scale and high-span.
本文针对高跨比较小的三车道公路隧道，结合某工程设计的支护结构体系进行了模型试验研究，并进行了必要的有限元计算分析。
In this paper, by the model test, authors study some design of support structure system with three-lane road tunnel of small-scale and high-span.
本文针对高跨比较小的三车道公路隧道，结合某工程设计的支护结构体系进行了模型试验研究，并进行了必要的有限元计算分析。
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