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本文研究复合式衬砌承受围岩压力的大小和分布规律,并探讨大断面隧道通过软弱围岩的合理施工方法及支护结构。用钢弦压力盒量测围岩压力,还使用液压应力计进行量压元件的对比试验,通过试验可看出:两种量测元件量出压力的发展趋势是一致的;能反映施工影响;当支护衬砌变形基本稳定后,衬砌承受的围岩压力仍继续增加,二次(内层)衬砌是受力的,而且较大。
This paper studies the size and distribution of surrounding rock under pressure in composite lining and discusses the reasonable construction method and supporting structure of large-section tunnel through weak surrounding rock. With the steel string pressure box to measure the pressure of surrounding rock, the hydraulic stress meter is also used to carry out comparison test of the pressure-measuring element. The test shows that the development trend of the two kinds of measuring elements is the same; it can reflect the construction impact; When the supporting lining deformation is basically stable, the surrounding rock pressure on the lining continues to increase, the secondary (inner) lining is stressed, and larger.