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对土冻胀有直接影响的因素中,土的固体颗粒(矿物成分、粒度大小)是一个很重要方面。对于砂类土这个重要因素主要表现在粒度成份上,其中最具强烈影响的是粉粘粒含量。我国《工业与民用建筑地基基础设计规范(TJ7—74)》对细砂土冻胀性判别标准规定为:只要大于0.1毫米颗粒含量超过全重85％时,不论其它条件(含水量、地下水)如何,都认为是不冻胀的(按“规范”编制说明其冻胀系数K≤1%),否则按粉砂确定。这里虽然亦强调了粒度成分的影响,但是对其余粒径小于0.1毫米部分(其中包括砂粒和粉粘粒)没有进一步说
Among the factors that have a direct impact on soil frost heave, the solid particles of the soil (mineral composition, grain size) are an important aspect. For sandy soil, this important factor is mainly manifested in the grain size composition, and the most strongly affected is the content of powder clay. China’s “Code for Design of Foundations for Industrial and Civil Buildings (TJ7-74)” stipulates that the criterion for frost heaving of fine sands is: as long as the content of particles larger than 0.1 mm exceeds 85% of the total weight, regardless of other conditions (moisture content, groundwater) How do you think that it is not frost heaving (the “standard” preparation shows that the frost heave coefficient K ≤ 1%), otherwise determined by the silt. Although the influence of the particle size component is also emphasized here, there is no further explanation for the remaining part of the particle size smaller than 0.1 mm (including sand grains and clay particles).