首页|冲击压缩载荷作用下损伤砂岩的动态能量演化及破碎特征

冲击压缩载荷作用下损伤砂岩的动态能量演化及破碎特征

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开挖和构造运动等外部扰动使岩体处于不同程度的损伤状态,损伤岩体内缺陷的产状、密度和大小与预制裂隙岩体存在显著的差异.本研究基于Weibull分布,分析了冲击载荷作用下损伤岩体的耗能密度增长率与静态损伤因子之间的理论关系,并通过室内试验开展验证.采用不同上限静态预压后使砂岩处于不同程度的损伤状态,并用CT成像进行验证.然后,利用高速摄像机和几何分形技术探究了不同驱动压力作用下不同损伤砂岩的破裂过程和破碎特征.实验结果验证了耗能密度增长率关于静态损伤因子的函数关系式服从Weibull分布,耗能密度增长率随着损伤因子的增加逐渐增大;随着砂岩损伤程度或驱动压力的增加,破碎岩块的数量和破碎程度都增加.这些研究成果扩展了岩石动力学理论,验证了冲击载荷下损伤砂岩的能量演化、破裂过程和碎裂特征,还为动力灾害显现下岩体的风险解危提供了参考.
Dynamic energy evolution and fragmentation characteristics of damaged rock under impact compression loading
In sharp contrast to prefabricated cracks,the damage to rock masses resulting from external disturbances such as excavation disturbances and tectonic movement varies substantially as to the incidence,density,and magnitude of defects.The growth ratio of the energy dissipation density proportion D(Rω(α))of the damaged rock under impact loading is closely related to the static damage factor D(α)and is theoretically explored based on the Weibull distribution in this paper.Sandstones with varied damage levels after distinct static precompression,as described by CT imaging,are used to evaluate the impact load of different driving pressures.In addition,a high-speed camera and geometric fractal are used to exhibit the ejection and fragmentation characteristics of the pulverized sandstones after impact loading.The experimental outcomes confirm the theoretical study where the function ofD(Rω(α))involving D(α)obeys the Weibull distribution,and theD(Rω(α))slowly rises with the expansion of the damage factor.With the increase of either the damage level or driving pressure of the sandstone,the number of pulverized rocks,the fragmentation degree,and the D(Rω(α))all increase.These results further advance rock dynamic theory and corroborate the energy evolution,ejection,and fragmentation characteristics of damaged sandstone under impact loading.These results can also serve as references for rock dynamic risk mitigation under dynamic catastrophes..

damaged rockenergy evolutionfragmentation characteristicsdynamic response

郑强强、钱佳威、李萍丰、殷志强、赵桓庭

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安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南 232001

非煤露天矿山安全智能开采国家矿山安全监察局重点实验室,广东肇庆 526530

中国科学技术大学地球和空间科学学院,安徽合肥 230026

安徽至博光电科技股份有限公司,安徽合肥 230088

宏大爆破工程集团有限公司,湖南长沙 410011

河海大学海洋学院,江苏南京 210024

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损伤岩石 能量演化 破碎特征 动力响应

Scientific Research Foundation for High-level Talents of Anhui University of Science and Technologyindependent project of State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines(2023)国家自然科学基金

2023yjrc1 12SKLMRDPC23KF1052074009

2024

10.1007/s11770-024-1086-7

应用地球物理(英文版)
中国地球物理学会

应用地球物理(英文版)

影响因子：1.01
ISSN：1672-7975
年,卷(期)：2024.21(2)
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