层状岩体冲击—冻融耦合损伤规律研究

金属矿山 ›› 2025, Vol. 54 ›› Issue (6): 27-35.

层状岩体冲击—冻融耦合损伤规律研究

张亚宾^1,2 　李宜杨¹ 　卢宏建¹ 　赵春洁¹ 　白晋凯¹

1. 华北理工大学矿业工程学院,河北唐山 063210;2. 河北省矿山绿色智能开采技术创新中心,河北唐山 063210

出版日期:2025-06-15 发布日期:2025-07-08
作者简介:张亚宾(1977—),男,教授,博士。
基金资助:
河北省中央引导地方科技发展资金项目(编号:246Z4101G)

Study on the Damage Law of Impact and Freeze-thaw Coupling of Layered Rock

ZHANG Yabin^1,2 　 LI Yiyang ¹　 LU Hongjian¹　 ZHAO Chunjie ¹　 BAI Jinkai ¹

1. College of Mining Engineering,North China University of Science and Technology,Tangshan 063210,China; 2. Mine Green Intelligent Mining Technology Innovation Center of Hebei Province,Tangshan 063210,China

Online:2025-06-15 Published:2025-07-08
Supported by:

摘要/Abstract

摘要： 针对矿山生产中开采作业造成的具有一定冲击损伤但不完全破碎的层状岩体,开展了含冲击裂纹的层状岩体的冻融损伤研究。通过入射幅值为 60、70、80 和 90 mV 的层状岩体冲击试验,将冲击后未完全破碎的试件进行冻融循环损伤及 NMR 测试,分析冻融损伤规律。结果表明:当以 60 mV 和 70 mV 的入射幅值循环冲击 1 ~ 3 次时,岩石试件表面均出现裂纹,80 mV 及以上的岩石试件破碎。层状岩体试件随冲击次数增加,应力峰值下降,最大应变与应变率增大,造成了损伤程度加深,抵抗破坏的能力减弱。冲击后初始孔隙度的分布以小孔隙为主,中孔隙其次,大孔隙最少。随着冻融次数增加,中大孔隙发育拓展导致小孔孔隙度分量减少。通过冲击后的最终损伤变量与 30、60 和 90 次冻融循环损伤变量拟合,呈现出指数分布,冲击损伤促进了冻融损伤的发育。研究成果可为含有层状岩体的寒区矿山预防地质灾害提供理论支持。

关键词: 层状岩体, 　 SHPB　, 冻融循环　, NMR　 , 孔隙度

Abstract: Aiming at the layered rock mass with certain impact damage but incomplete breakage caused by mining operation in mine production,the freeze-thaw damage of layered rock mass with impact cracks was studied. Through the impact test of layered rock mass with incident amplitudes of 60,70,80 and 90 mV,the freeze-thaw cycle damage and NMR test were carried out on the specimens that were not completely broken after impact,and the freeze-thaw damage law was analyzed. The results show that when the incident amplitude of 60 mV and 70 mV is cycled for 1 to 3 times,cracks appear on the surface of rock specimens,and rock specimens with 80 mV and above are broken. With the increase of impact times,the peak stress of layered rock mass specimens decreases,and the maximum strain and strain rate increase,resulting in the deepening of damage and the weakening of the ability to resist damage. The distribution of initial porosity after impact is dominated by small pores, followed by medium pores,and the least is large pores. With the increase of freeze-thaw times,the development of medium and large pores leads to the decrease of small pore porosity component. By fitting the final damage variable after impact with the damage variable of 30,60 and 90 freeze-thaw cycles,the exponential distribution is presented,and the impact damage promotes the development of freeze-thaw damage. The research results can provide theoretical support for the prevention of geological disasters in mines in cold regions containing layered rock mass.

Key words: layered rock,SHPB,freeze-thaw cycle,NMR,porosity

中图分类号:

TU458+. 2

张亚宾, 李宜杨, 卢宏建, 赵春洁, 白晋凯. 层状岩体冲击—冻融耦合损伤规律研究[J]. 金属矿山, 2025, 54(6): 27-35.

ZHANG Yabin, LI Yiyang, LU Hongjian, ZHAO Chunjie, BAI Jinkai. Study on the Damage Law of Impact and Freeze-thaw Coupling of Layered Rock [J]. Metal Mine, 2025, 54(6): 27-35.

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