冻土隧道冻胀力等级划分标准研究

Study on Classification Standard of Frost-Heave Force for Tunnels in Frozen Zone

对于冻土隧道,当作用于衬砌上的冻胀压力大小不同时,应考虑不同的设防措施,力求达到既安全又经济的目的。以昆仑山隧道为背景,首次提出冻胀力等级划分的标准。研究结果表明:对于单线铁路隧道,深埋条件下冻胀力的等级可通过0.07MPa和0.3MPa两个广义冻胀力值,浅埋条件下可通过0.3MPa和0.7MPa两个广义冻胀力的峰值,作为分界值将冻胀力划作三个等级。

For tunnels in frozen zone, different countermeasures should be considered for the sake of being both safe and economical when different frost-heave forces are applied on the tunnel lining. Based on the case of Kunlunshan tunnel, the classification standard of the frost-heave force is presented in this paper. The results show that, the frost-heave force can be divided into three classes by the following two values for the single-line railway tunnels: 0.07 MPa and 0.3 MPa for the deep tunnels; 0.3 MPa and 0.7 MPa for the shallow tunnels.