Swelling soils have the character swell when watered and s hrink when d ried out,the strength is gradually reduce when it takes back and forth,to caus e severely damages of highway slope.

• 膨胀土具有吸水膨胀、失水收缩并在胀缩往复中强度逐渐衰减的性质 ,对公路边坡有严重的破坏作用。