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建筑在季节性冻土地区的桥涵,基础埋置深度除考虑地基的地质条件、保证持力层稳定的最小埋深、河流的冲刷深度、上部结构型式和当地的地形条件等因素外,特别要考虑当地的冻结深度。本文根据几年来对土的冻胀性试验,而得到的冻胀率与冻深的关系、季节性冻土分类等,商讨桥涵基础最小埋置深度问题,并提出计算公式。
For the bridges and culverts built in the seasonal frozen soil region, the buried depth of the foundation should be determined by considering not only the geological conditions of the foundation, the minimum depth of stability of the holding layer, the erosion depth of the river, the superstructure type and the local topography conditions Consider the depth of the local freeze. In this paper, based on the years of frost heave test of soil, the relation between frost heave rate and frost heave depth, seasonal frozen soil classification and so on, the minimum embedding depth of bridge and culvert foundation is discussed, and the calculation formula is proposed.