冲击荷载下煤岩破碎过程能量释放研究

doi:10.13722/j.cnki.jrme. 2021.0214

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摘要为探究岩石破碎过程的能量释放特征，利用霍普金森压杆对煤岩展开不同围压和应变率的动态冲击压缩试验，基于SHPB耗散能计算弹性能，讨论煤岩不同初始应力水平和应变率下煤岩的能量释放特征，并进一步探究能量释放对岩石破碎的影响。结果表明：冲击荷载下，煤岩动态应力–应变曲线基于能量演化过程可明确划分为5个阶段。煤岩具有明显的应变率效应，变形破坏过程存在能量释放滞后效应，弹性能的释放均发生在峰值应力后；随着应变率增大，弹性储能极限呈二次多项式增长，弹性能释放应力呈线性增长；将释放应力进行归一化发现在单轴条件下其变化规律呈线性增长趋势，在三轴条件下呈线性减小趋势，且初始围压越大，应变率依赖性减弱。依托煤岩动态破碎过程中弹性能的释放程度，提出反映岩石破碎效果的能量指标W，其变化规律与煤岩破碎块度呈反比，为破岩效果改善和动力灾害预防提供了一种新的参考手段。

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	刘晓辉1
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	薛洋2
	郑钰2
	桂欣2

关键词 ：岩石力学, 动态应变率, 煤岩, 能量演化, 能量释放

Abstract：In order to explore the energy release characteristics of rock fragmentation，impact compression tests with different strain rates and initial stress levels are carried out on coals by the Hopkinson pressure bar. In this paper，the elastic energy is calculated based on the dissipated energy of SHPB tests. The energy release characteristics are discussed under different confining pressures and strain rates. The effect of energy release on rock fragmentation is further investigated. The results show that：based on the energy evolution process，the dynamic stress-strain curve of coals can be divided into 5 stages under impact load. The obvious strain rate effect of coal was proved. The energy release lag effect was discovered in the process of rock failure. The elastic energy is released after the peak stress. As the strain rate increases，it is found that the elastic energy storage limit increases with quadratic polynomial and the elastic energy release stress increases linearly. The normalized value of release stress is found to increase linearly under uniaxial condition and decrease linearly under triaxial condition. With the increase of confining pressure，the strain rate dependence of release stress is weakened. The energy index W is put forward based on the release degree of elastic property. The effect of rock fragmentation can be reflected by W. The inverse relationship between W and fragmentation degree of coal rock was found. A new reference means for improving rock-breaking effect and preventing dynamic disaster are provided through W.

Key words： rock mechanics dynamic strain rate coal rock energy evolution energy release

引用本文:

刘晓辉1，2，薛洋2，郑钰2，桂欣2. 冲击荷载下煤岩破碎过程能量释放研究[J]. 岩石力学与工程学报, 2021, 40(S2): 3201-3211.
LIU Xiaohui1，2，XUE Yang2，ZHENG Yu2，GUI Xin2. Research on energy release in coal rock fragmentation process under impact load. , 2021, 40(S2): 3201-3211.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme. 2021.0214 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/IS2/3201

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