山西黄土地区土基回弹模量的试验研究

Test Research of Rebound Module of Subgrade in Shanxi Loess Area

通过室内试验,分析了不同压实度条件下,含水量对回弹模量的影响,并建立了含水量与回弹模量的相关关系.结果表明,回弹模量随着含水量的增大而减小,并没有在最佳含水量和最大压实度的条件下出现最大值,表明含水量对回弹模量的影响程度较压实度大.在不同压实度条件下,回弹模量与含水量的相关关系呈现一定的规律:试验中采用了A,B,C 3种土样,其中土样A和B回归公式中的一次项、二次项和截距的系数的绝对值随击实次数的增大而增大,C土样回归公式中的一次项、二次项和截距的绝对值是逐渐减小的.

The effect of the moisture content on the rebound module is analyzed in different compaction conditions by laboratory experiments and the relationship of moisture content and rebound module is established.The results show that there is no maximum rebound module under the optimum moisture content and the maximum compactness conditions,while it decreases with the increase of the moisture content,which indicates the moisture content has greater effect on the rebound module than the compactness.The correlation between the rebound module and the moisture content presents a certain regularity under the conditions of different compacness：there are three soil samples,A,B and C used in the experiment,A and B soil samples’s absolute values of coefficients of linear,quadric terms and intercept of the regression formula increase with the increase of the compaction times,and C soil sample’s absolute values of these coefficients decrease with the increase of the compaction times.