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吸水膨胀、失水收缩是粘性土的共同特征,而对于膨胀土与非膨胀土来说,其区别则主要在于当它们得到或失去同量水分时,其胀、缩量有着明显的差异。那么,如何衡量它们之间的这种胀缩差异呢?这就首先要弄清楚引起土胀、缩的主要影响因素。一般认为,这些因素主要有:(一)土的成分(包括矿物成分、化学成分和粒度成分);(二)土的结构(主要指颗粒之间的排列情况和连接特征);(三)土的状态(主要指湿度)。其中土的状态变化,主要是土中自由水和薄膜水的得失变化,是引起土胀、缩
Water swelling and water loss shrinkage are the common features of clay soil. For expansive soil and non-expanded soil, the main difference is that when they get or lose the same amount of water, their swelling and shrinkage have obvious differences. Then, how to measure the difference between the expansion and contraction between them? First of all, it is necessary to clarify the main factors causing the expansion and contraction of the soil. It is generally believed that these factors mainly include: (a) the composition of soil (including mineral composition, chemical composition, and particle size composition); (b) the structure of soil (mainly the arrangement and connection characteristics between particles); (c) soil The state (mainly refers to humidity). The change in the state of soil is mainly the change in the gain and loss of free water and thin film water in the soil, which is caused by soil swelling and shrinkage.