School of Energy Science and Engineering,Henan Polytechnic University
Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Henan Polytechnic University

为了研究加卸载后含铜矽卡岩在轴压及频繁扰动共同作用下的动力学特征,以冬瓜山铜矿井下900m深处出矿进路附近的含铜矽卡岩为研究对象,利用改进的SHPB加载试验装置开展加卸载后含铜矽卡岩在轴压及频繁扰动共同作用下的动态力学试验,研究含铜矽卡岩的动态变形特征、能量耗散特征和破坏模式等。结果表明:不同冲击气压产生的动荷载对含铜矽卡岩的变形特征无明显影响,表现为试样的动态应力-应变曲线呈近似抛物线形状;随频繁扰动次数增加,含铜矽卡岩的峰值应力减小,峰值应变增大;随冲击气压增大,入射能、反射能、透射能和吸收能均增大,单位体积吸收能随入射能增大而增大,表现为吸收能量的过程;频繁扰动次数不断增加导致试样内部损伤程度加剧,微裂纹增多且扩展速度加快,最终导致试样发生宏观破坏,影响岩石破坏块度大小,同时也增大了“岩爆”的发生概率。

The dynamic mechanical tests of copper-bearing skarn under axial compression and frequent dis‑turbance after loading and unloading were carried out by an improved SHPB device. The copper-bearing skarn at a depth of 900 m below the Dongguashan Copper Mine was taken as the research object,and the dynamic deformation characteristics,energy dissipation characteristics and failure modes were studied.The results showed that the deformation characteristics of copper-bearing skarn were not significantly affected by the dynamic loads generated by different impact air pressures.And the dynamic stress-strain curves of the rock samples were approximately parabolic.The peak stress of copper-bearing skarn decreased and the peak strain increased with the increase number of frequent disturbance number.The incident,inverse,transmitted and absorbed energy increased with the increase of impact pressure.The absorbed energy per unit volume in‑creased by the increase of the incident energy,showing the process of absorbing energy.The internal damage degree of the rock samples increased by the increase number of frequent disturbance. Meanwhile,micro-cracks increased and the rate of expansion accelerated,which eventually led to the macroscopic damage of samples.The fragmentation of rock failure was affected and the probability of “rock burst” also increased.

国家自然科学基金资助项目(51904093);河南省重点研发与推广专项项目(科技攻关)(222102320011)

0 引言
1 试验系统及方案
1.1 试样制备
1.2 试验系统
1.3 试验方案
1.4 试验原理
2 结果与分析
2.1 试验结果
2.2 动态变形特征
2.3 动态峰值应力变化规律
2.4 动态峰值应变的变化规律
3 能量耗散特征分析
3.1 不同冲击气压下能量的变化规律
3.2 单位体积吸收能的变化规律
3.3 固定冲击气压下能量的变化规律
3.4 固定冲击气压下能量之间变化规律
3.5 试样破坏形态
4 结论

王春,张攀龙,李心茹,等 . 加卸载后含铜矽卡岩在轴压及频繁扰动共同作用下的动力学特征[J]. 河南理工大学学报(自然科学版),2023,42(5):29-37.doi:10.16186/j.cnki.1673-9787.2022080022

WANG C,ZHANG P L,LI X R,et al.Dynamics characteristics of copper-bearing skarn under the combined action of axial compression and frequent disturbance after loading and unloading[J].Journal of Henan Polytechnic University(Natural Sci‑ence),2023,42(5):29-37.doi:10.16186/j.cnki.1673-9787.2022080022