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水荷载是水工隧洞的主要荷载.在隧洞静力计算中,通常把水压力作为边界力处理,而且没有考虑水荷载作用的时间因素.这种计算方法在某些情况下将导致较大的误差。本文建议的方法是把水荷载作为场力来处理,考虑水荷载与隧洞开挖及衬砌相对时间关系进行隧洞围岩及衬砌的静力计算.由于地质构造作用,岩体是裂隙介质,渗流场的计算考虑了岩体的这一特点,采用了相应的数学模型.静力计算视岩体为各向异性弹性介质,并考虑了节理裂隙的影响以及隧洞开挖、支护和衬砌施工与水荷载作用的相互时间关系.按上述原则编制出隧洞计算专用程序SJDI.程序中还附有在初应力场及渗流场作用下,计算隧洞分层开挖、分期支护时各个时段应力场及位移的功能.
The water load is the main load of the hydraulic tunnel. In the static calculation of the tunnel, the water pressure is usually treated as the boundary force, and the time factor of the water load is not considered. This calculation method will lead to larger in some cases. error. The method proposed in this paper is to treat the water load as the field force, and consider the static relationship between the surrounding load of the tunnel and the relative time of the tunnel excavation and lining. Due to the geological structure, the rock body is a fractured medium and seepage field. The calculation considers this feature of the rock mass and uses a corresponding mathematical model. The static calculation of the visual rock mass is an anisotropic elastic medium, taking into account the effects of joint fractures and tunnel excavation, support and lining construction and water. The mutual time relationship of the loads. According to the above principles, the SJDI program dedicated to the calculation of the tunnel is compiled. The procedures are also accompanied by the initial stress field and seepage field to calculate the stress field and displacement at various stages of the tunnel excavation and staging. The function.