It is easy to form subgrade disease on swelled ground because swelled ground has features of swelling and softening by absorbing water shrinking and cracking by losing water and repeated changing.
膨胀土具有吸水膨胀软化，失水收缩开裂及反复变化的特点，易形成路基病害。
Nanogels are sub-micron size, water-swellable cross- linked structures of hydrophilic polymers. They have the ability of absorbing large quantities of water, swelling quickly and biologic consistence.
纳米水凝胶是一种水溶胀性的，具有交联结构的亲水纳米高分子 材料， 因其含水量高、溶胀快、生物兼容性好等优点得到广泛研究及应用。
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