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采用“新奥法”施工的地下隧洞,其基本观点是把岩体视为连续介质,根据岩体具有的黏性、弹性、塑性的物理性质,并利用了洞室开挖后围岩应力重分布而产生的变形到松动破坏有一个时间效应的动态特性。“适时”地采用薄壁柔性支护结构,与围岩紧密贴合起来共同工作,从而调动并充分利用围岩的自身承载力,以达到洞室稳定的目的。而“适时”的概念,是需要从现场的监控量测成果进行回归分析及统计,根据其回归分析曲线,找出最适宜的时间。并根据其变形发展趋势,选择不同的支护手段以确保洞室稳定,因此锚杆支护、喷射混凝土、现场量测被誉为“新奥法”的三大法宝。
The underground tunnel constructed with “new Austrian law ” is based on the rock mass as a continuous medium. According to the viscoelastic, elastic and plastic physical properties of the rock mass, the surrounding rock Stress redistribution and deformation caused by loose damage has a dynamic effect of time. “Thin-walled flexible support structure is adopted in” timely manner “and closely cooperates with the surrounding rock to mobilize and make full use of the self-bearing capacity of the surrounding rock so as to achieve the purpose of stable cavern. The ”timely “ concept is the need to monitor the measured results from the site regression analysis and statistics, according to its regression analysis of the curve to find the most appropriate time. According to the trend of its deformation, choose different support means to ensure the stability of the cave, so bolt support, shotcrete, field measurement known as the ”New Austrian law," the three magic weapon.