黄金科学技术 ›› 2022, Vol. 30 ›› Issue (4): 540-549.doi: 10.11872/j.issn.1005-2518.2022.04.026
Kui ZHAO1,2(),Zhouchao LIU1,2,Peng ZENG1,2(),Cong GONG1,2
摘要:
对4种不同尺寸(40,70.7,100,150 mm)的充填体试件进行了室内单轴压缩试验,研究了尺寸变化对充填体能量演化规律和损伤破坏机制的影响,并得到了基于弹性能耗比的充填体破坏前兆判据。研究结果表明:单轴压缩下不同尺寸充填体的能量演化规律相似,体现为峰前以弹性应变能积蓄为主,峰后耗散能占比不断上升并迅速超越弹性应变能;随着试件尺寸的增加,充填体在峰值应力处总输入应变能、弹性应变能和耗散能均呈非线性下降趋势;根据耗散能曲线,可将充填体能量损伤演化过程划分为初始损伤、损伤加速、损伤稳定发展和损伤破坏4个阶段;试件尺寸越大,弹性能耗比K值变化幅度越大;弹性能耗比K值曲线整体先上升后下降,持续到一个较低值,在临近峰值应力处再转为上升。弹性能耗比K值曲线的这一变化规律可作为充填体临界破坏前兆特征。
中图分类号:
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