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深埋于地层之中的圆形压力水工隧洞,无论是坚硬围岩还是软弱围岩,以往多按普氏和太沙基山岩压力理论及弹性抗力假定,采用结构力学或与弹性力学相结合的计算方法设计衬砌结构,这在某些情况下,不符合实际情况。对于支护结构的合理设计,国内外都在不断地探讨新方法,目前采用《新奥法》进行支护设计就是其一。本文视压力水工隧洞的围岩和混凝土衬砌为不同的弹性介质,运用弹性理论,推导出在轴对称岩体应力和内水压力联合作用下,计算混凝土衬砌及位移的计算式为:
Deeply buried in the strata of the round pressure hydraulic tunnel, whether it is hard surrounding rock or soft rock, past Platts and too Basis Rock pressure theory and elastic resistance assumption, the use of structural mechanics or with the combination of elasticity The calculation of the design lining structure, which in some cases, does not meet the actual situation. For the reasonable design of support structure, both domestic and overseas are constantly exploring new methods. At present, the support design using “New Austrian Law” is one of them. In this paper, the surrounding rock and concrete lining of hydraulic tunnel are regarded as different elastic media. Based on the elastic theory, the calculation formula of concrete lining and displacement under the combined action of axial symmetrical rock mass stress and internal water pressure is deduced as follows: