软土卸荷次回弹变形特性研究

Study on secondary resilience deformation of soft soil under unloading

对汕揭高速公路BK0+250右断面的淤泥土样进行了蠕变试验研究,确定了原状土和重型土的主次回弹变形的划分方法.研究结果表明:当回弹比相同、最大预压荷载不同时,次回弹系数相同;当最大预压荷载相同、回弹比不同时,次回弹系数随回弹比的增大而增大.

Creep experiment was performed on silt samples from the right section BK0 ＋ 250 of Shantou-Jieyang Expressway. The method for classification of the primary and secondary resilience deformation of undisturbed soil and disturbed soil was determined by analysis of the experimental result. It is concluded that the coefficients of secondary resilience of the two soil samples are the same under the condition that the resilience ratios of the soil samples are the same, while the maximum pre-loads are different; otherwise, if the resilience ratios are different, the coefficients of secondary resilience of the two soil samples increase with the increase of the resilience ratios under the same maximum pre-loads.