不同剂量石灰处治高液限红粘土物理力学及工程性质

Physical Mechanics and Engineering Property of High Liquid Limit Red Clay Treated by Different Doses of Lime

针对高液限红粘土工程性质较差的特点,研究经不同剂量石灰处理以后土体的CBR值、无侧限抗压强度、弹性模量、毛细水上升高度、渗透性能和膨胀性.得出高液限红粘土中随着石灰用量的增加,土的CBR值不断增加,无侧限抗压强度和模量也有很大提高,吸水量减小,抗渗性能增加.当石灰用量达到10％以后土体模量增加幅度变缓,吸水量基本不再发生变化.膨胀率随石灰剂量的增加而降低,石灰剂量为4％ ～ 8％时膨胀率趋于稳定,石灰剂量的最佳配比应在大于4％小于8％的范围内.

Aiming at the characteristic of poor engineering property of high liquid limit red clay,the paper studies its CBR value,unconfined compressive strength,modulus of elasticity,capillary water rise height,permeability and expansion after treatment by the different doses of lime.Result shows that the CBR value is constantly increasing in the high liquid limit red clay with the increment of the lime doses,and the unconfined compressive strength and modulus are also greatly improved,the water absorption is reduced and the impermeability is increased.When the lime dose reaches 10%,the clay modulus will increase slowly,and the water absorption is basically not changed.Expansion decreases with increment of lime dose.The expansion rate becomes stable when the lime doses are 4%~8%.The optimal doses of lime should be in the range of more than 4%and less than 8%.