基底模量对路基振动压实能量影响的数值计算分析

路基填筑时,基底模量的大小对上层振动压实具有较大影响。利用ABAQUS软件对两层土体现场振动压实和室内击实试验进行数值模拟,分析这两种情况中上层土体单位体积应变能最小值随基底模量的变化规律,表明基底模量对振动压实和击实试验应变能的吸收均具有较大影响,应变能最小值随着基底模量的增大而增大,呈非线性变化。归一化分析表明,振动压实与击实试验应变能最小值之比随着基底模量与上层模量之比减小而减小。当基底模量与上层模量之比超过0.8时,压实应变能最小值归一化比值超过0.9;当基底模量与上层模量之比超过0.6时,归一化比值超过0.8。这个结果对现场诸多工况具有参考意义。

The Influence of Base Modulus on Compaction Energy in Subgrade

The modulus of base layer soil is related to upper vibrating compaction when filling the subgrade.Through numerical simulation of the soil sample with double layers by ABAQUS,both on-site and in laboratory compaction tests,the author has investigated the rule of the minimum strain energy per unit volume in upper layer soil by the modulus of base layer soil.It shows that the base modulus has a big role to play in the on-site compaction and the absorption of strain energy of laboratory compaction and the absorption of the minimum strain energy increases with the increase of base modulus,displaying a non-linear change.The article has conducted comparative analysis of the rule of how the ratio of the on-site compaction strain energy to that of indoor compaction changes with the ratio of upper layer modulus to base layer modulus,which shows the energy ratio would be reduced with the modulus reduced.After normalization analysis,the results show that the compaction energy normalization ratio would exceed 0.9 when the modulus ratio exceeds 0.8,and the energy ratio exceeds 0.8 when the modulus ratio exceeds 0.6.This conclusion has theoretical guidance for many on-site construction situations.