砂砾料之冻胀敏感性

用砂砾料换填细粒土地基,防治寒冷地区建筑物冻害是行之有效的方法,在国内外广泛使用。饱水砂砾料冻结时之冻胀敏感性,以冻胀率的大小作为分类指标。它主要受细粒土含量及冻结条件的影响。试验研究结果表明,在开敝系统中,砂砾料的冻胀率η分别随冻结速率Vf之降低、及其中细粒土含量C之提高而呈幂函数关系递增。经多元回归分析,其关系可用式η=B₀V_f^B1C^B2满意地拟合,并已绘成相应的图解,它们对各工程设计、施工部门在合理选料、设计垫层厚度及基础埋置深度等方面很有参考价值。

Frost Susceptibility of Sandy Gravel during Freezing

Replacing fine grained subsoil with sandy gravel for preventing structures from frost damage is widely and effectively used in cold regions at home and abroad. The frost heave ratio, as an index of classification of frost susceptibility for sandy gravel, mainly depends on not only the. content of fine grained soil but also its freezing condition. Our experimental results show that the frost heave ratio, η, of sandy gravel in open system increases with the increase of the content of fine grained particle, C, and with the decrease of the frost penetration rate, V1, as a power function, and can be expressed by η = B0VfB1CB2 satisfactorily. Graphical solutions have been given, which might be very useful for designing the size distribution and the thickness of sandy gravel cushion, and the depth of foundation reasonablely.