浅埋暗挖隧道中管棚超前预支护优化

摘要

Pipe-roof supporting method is widely used in the tunnel excavation, especially in the soft ground and the shallow, large span of lot. But its design is mainly dependent on the engineering analogy method. The work is based on the tunnel engineering, makes an explanation to determine the demarcation of buried deep and shallow tunnels, simplifies the calculation of the pipe-roof supporting, calculates the surrounding rock pressure around the tunnel, analyses and optimizes the distance of pipe-roof. It will give the guiding significance to the pipe-roof supporting construction.%管棚工法被广泛地应用在隧道开挖中,尤其在软弱地层及浅埋、大跨度地段,但其设计主要依赖于工程类比.结合某隧道工程,对深埋和浅埋隧道的判定作了说明,简化了管棚超前支护设计的计算图式,计算隧道周围围岩压力并对管棚间距的选取进行了分析优化,对管棚超前支护施工具有指导意义.