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隧洞衬砌结构的强度设计,主要是根据所在地层的弹性抗力系数“K”和普氏系数“f”二指标来进行的,因此二值的大小直接关系到衬砌的硐和钢筋用量,也就是说直接决定着隧洞的造价和建筑物的安全性。在工程地质界,对普氏系数一般还熟悉,而对弹性抗力系数就较生疏,尤其是对该值的确定更感困难。已建成的官厅、古田、狮子滩等水电站的引水隧洞的“K”值,都是凭地质人员的“经验”而确定的,这样确定的数值,水工设计人员往往难以对其信任,而地质人员本身信心亦不高,不过到目前为止,国内还没有比这经验方法更好的办法。
The strength design of the tunnel lining structure is mainly based on the two indexes of the elastic resistance coefficient “K” and the Platts coefficient “f” of the location layer, so the magnitude of the binary value is directly related to the lining concrete and the amount of steel reinforcement, that is to say, It directly determines the cost of the tunnel and the safety of the building. In the engineering geological world, it is generally familiar with the Platts coefficient, and it is more difficult to determine the elastic resistance coefficient, especially the determination of this value. The “K” values of the diversion tunnels of the built hydropower stations of Guanting, Gutian, and Lion Beach are all determined by the “experience” of the geologists. Such determined values make it difficult for hydraulic design engineers to trust and geology. The personnel themselves are not confident, but so far, there is no better way than this empirical method.