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利用直径为φ25 mm的聚碳酸脂分离式SHPB试验装置和真空封泥作为波形整形器,以不同速度撞击试件,测试了不同压实度和含水率试件在应变率范围为600～2 500 s-1内的动态力学性能,并对试验结果的有效性进行了讨论,分析了冲击压缩荷载作用下应力-应变曲线、动态峰值应力与峰值应变,动态峰值应力和峰值应变增长因子以及比能量吸收与应变率之间的关系。研究结果表明:压实黏性土的动态峰值应力、峰值应变和比能量吸收随应变率的增大而增大,而压实度与含水率对压实黏性土的动态峰值应力、峰值应变和比能量吸收基本无影响;压实度与含水率对动态峰值应力和峰值应变增长因子有较大影响;比能量吸收随应变率而呈指数增长。
Using a SHPB test device with a diameter of 25 mm and a vacuum sealing mortar as a waveform shaper, the specimens were impacted at different speeds to test specimens with different compaction degrees and water contents in the strain rate range of 600 to 2 500 s-1 dynamic mechanical properties, and the effectiveness of the test results were discussed, the impact of compressive load under stress-strain curve, dynamic peak stress and peak strain, dynamic peak stress and peak strain growth factor and specific energy The relationship between absorption and strain rate. The results show that the dynamic peak stress, peak strain and specific energy absorption of compacted clay increase with the increase of strain rate, while the compaction degree and water content have significant influence on dynamic peak stress, peak strain And had little effect on energy absorption. Compaction and moisture content had a significant effect on dynamic peak stress and peak strain growth factor; and specific energy absorption increased exponentially with strain rate.