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为了得到应变率为10~80 s(~1)的动载条件下分层充填体的动态力学特性及变形破坏规律,利用分离式Hopkinson杆系统对其进行冲击加载实验。实验结果表明,分层充填体的动态抗压强度及动态强度增长因子与应变率均存在正相关关系。分层充填体的动态抗压强度随着算术平均灰砂比的增加而增大,与静态抗压强度相比,分层充填体的动态峰值强度增加了11%~163%。此外,分层充填体的能量吸收率随着水泥平均含量的升高而降低,且介于组成分层充填体的单体试块之间。分层充填体的形变表现出了不连续性,其强度较低的部分形变程度大于强度较高的部分。为了分析分层充填体试块的稳定性状态,利用基于Stenerding-Lehnigk准则推导出的改进方程来判断分层充填体的失稳条件,计算结果与3组试验结果的误差仅为4.80%、3.89%和4.66%。
In order to get the dynamic mechanical properties and the deformation and failure rules of the layered filling body under the dynamic loading condition with the strain rate of 10 ~ 80 s (~ 1), the split Hopkinson bar system was used to carry out the impact loading experiment. The experimental results show that there is a positive correlation between dynamic compressive strength and dynamic strength growth factor of stratified filling body and strain rate. The dynamic compressive strength of layered packings increases with the increase of arithmetic average sand-sand ratio. The dynamic peak intensities of layered packings increase by 11% ~ 163% compared with the static compressive strength. In addition, the energy absorption rate of the layered filler decreased with the increase of the average cement content, and it was between the monomer blocks that make up the layered filler. Deformation of the layered filling body showed discontinuity, and the degree of deformation of the lower strength part was greater than that of the higher strength part. In order to analyze the stability state of the stratified filling block, the instability condition of the stratified filling body is judged by using the improved equation derived from the Stenerding-Lehnigk criterion. The error between the calculated results and the three experimental results is only 4.80% and 3.89 % And 4.66%.