冻土隧道冻胀力计算方法研究

Study on Calculation Method of Frost Force of Tunnels in Frozen Soil

鉴于应力场、温度场、渗流场3场耦合计算冻土隧道冻胀力的方法非常复杂,根据弹塑性力学及有限元理论提出冻土隧道冻胀力半理论半经验的计算方法,即以地温测试确定冻结圈范围、以原样力学测试确定冻结与非冻结状态围岩的物理、力学参数为先导,而后进行自重应力场与温度应力场双场耦合的数值计算方法,并通过模型试验验证此方法是可行的。

The method of calculating the frost force of tunnels in frozen soil by analysis on the coupled problem of stress field, thermal field and seepage field is very complicated. In view of this, a semi-theoretical and semi-experiential calculation method for the frost force of tunnels in frozen soil is proposed on basis of elastic-plastic mechanics and finite element theory. This calculation method is a numerical analysis method for the coupled problem of the dead weight stress field and the thermal stress field based on the determination of the scope of the frozen surrounding rock mass by testing the ground temperature and determination of the physical and mechanical parameters of the frozen and non-frozen surrounding rock mass by in-situ mechanical testing. The calculation method has been verified feasible by mode tests.