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本文用有限差分法计算了渠道基土冻胀过程中二维不稳定温度场的分布规律。模拟计算了渠道基土由于冻胀作用而对砌体产生的冻胀力。计算结果表明,在渠底和渠坡下部衬砌体所受冻胀应力最大,冻胀应力随深度呈衰减趋势。在两侧边界部位,由于受边界约束作用,冻胀应力随深度呈衰减—增大—衰减的震荡趋势,若使衬砌体完全不发生位移,即使在弱冻胀条件下,表面约束应力也达0.5×10~5N/m~2,可见用刚性衬砌约束冻胀变形是不行的,必须采取综合措施进行防治。
In this paper, the distribution law of two-dimensional unstable temperature field in the process of frost heave of subgrade soils is calculated by finite difference method. The frost heaving force generated by the masonry due to the frost heave effect of the channel foundation soil was simulated. The calculation results show that the lining body at the bottom of the canal and the bottom of the canal has the highest frost-heaving stress, and the frost-heaving stress decreases with the depth. On both sides of the boundary, due to boundary constraints, the frost-heaving stress attenuates with the depth-increasing-attenuating oscillating tendency. If the lining body is not displaced at all, even under weak frost heaving conditions, the surface restraint stress reaches 0.5×10~5N/m~2, it can be seen that the use of rigid lining to constrain frost heave deformation is not feasible, and comprehensive measures must be taken to prevent and control it.