首页|冲击荷载下充填节理岩体Ⅰ型裂纹动态扩展特性研究

冲击荷载下充填节理岩体Ⅰ型裂纹动态扩展特性研究

扫码查看
原文链接
  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
  • 维普
为研究冲击荷载作用下充填节理岩体Ⅰ型裂纹动态扩展特性,利用分离式霍普金森杆(split Hopkinson pressure bar,简称SHPB)试验系统及裂纹扩展测试系统,对石膏、水泥及云石胶3种充填节理的侧开三角形单边裂纹(single cleavage triangle,简称SCT)岩体试件进行动态冲击压缩试验,对比分析裂纹动态扩展过程及冲击破坏模式,并通过试验-数值法研究了Ⅰ型裂纹动态扩展过程中的应力强度因子及能量释放率的变化规律.研究表明:充填节理岩体主要有3种破坏模式,分别为预制裂纹扩展贯穿整个试件、裂纹贯穿后发生充填节理破坏、充填节理先破坏并阻滞裂纹贯穿;节理充填体的破坏与充填体强度、胶结力及应变率等相关;裂纹扩展速度自起裂处振荡增长,并在贯穿充填节理前某个位置达到最大,而应力强度因子及能量释放率在节理附近达到最大;充填节理刚度退化会抑制裂纹的扩展,并造成能量释放率的急剧增大;岩性组合差异加剧岩体试件材料属性的失配,导致应力强度因子及能量释放率随裂纹穿过节理后出现不同程度降低.
Dynamic propagation characteristics of mode Ⅰ crack in infilled jointed rock masses under impact load
To study the dynamic propagation characteristics of mode Ⅰ crack in infilled jointed rock masses under impact load,dynamic impact compression tests were implemented by a split Hopkinson pressure bar(SHPB)system and a crack propagation measurement device.The single cleavage triangle(SCT)specimens with the joints filled by gypsum,cement,and marble glue were adopted.The dynamic propagation processes and impact failure modes of the crack were analyzed,and the evolution laws of stress intensity factor and energy release rate during the dynamic propagation of mode Ⅰ crack were studied by the experimental-numerical method.The results show that there are three main failure modes of the infilled jointed rock masses:the prefabricated crack extends and penetrates the whole specimen,the infilled joint fails after the crack penetration,and the infilled joint fails first and then blocks the crack penetration.The failure of the filling body in the joint is related to the strength and cementation force of the filling body,as well as the strain rate of the dynamic load.The crack propagation speed has an oscillatory growth from the crack initiation point and reaches the maximum at a certain position before the crack penetrates the infilled joint,while the stress intensity factor and energy release rate reach the maximum near the joint.The stiffness degradation of the infilled joint inhibits the crack propagation and causes a sharp increase in the energy release rate.The difference in lithological combinations aggravates the material property mismatch of the rock mass specimens,resulting in different decreases of stress intensity factor and energy release rate as the crack passes through the joint.

impact loadinfilled jointmode Ⅰ crackstress intensity factorcrack propagation speed

张宪尚、文光才、朱哲明、隆清明、刘杰

展开 >

中煤科工集团重庆研究院有限公司瓦斯灾害监控与应急技术国家重点实验室,重庆 400037

四川大学建筑与环境学院,四川成都 610065

绍兴文理学院土木工程学院,浙江绍兴 312000

冲击荷载 充填节理 Ⅰ型裂纹 应力强度因子 裂纹扩展速度

国家自然科学基金国家自然科学基金重庆市自然科学基金重庆市杰出青年科学基金四川省自然科学基金

5220426152274246CSTB2023NSCQ-MSX0577CSTB2022NSCQ-JQX00142022NSFSC1915

2024

10.16285/j.rsm.2023.0237

岩土力学
中国科学院武汉岩土力学研究所

岩土力学

CSTPCD北大核心
影响因子：1.614
ISSN：1000-7598
年,卷(期)：2024.45(2)
  • 37