应力波作用下水平倾向液体充填岩石节理动态响应规律试验
Experimental investigation of dynamic response of liquid-filled rock joints with horizontal inclination under stress wave loading
朱建波 1孔骥 1黄震天 1孙家鑫 1吕岸霖 2张凯 1王加英3
作者信息
- 1. 深圳大学广东省深地科学与地热能开发利用重点实验室,广东深圳 518060;深圳大学土木与交通工程学院,广东深圳 518060
- 2. 广西交建工程建设集团有限公司,广西南宁 530003
- 3. 临沂市水利工程保障中心,山东临沂 276037
- 折叠
摘要
地下岩体工程中,液体充填岩石节理不可避免会受到地震、爆破等动力扰动.由于液体具有流动性,不同倾向节理中的液体呈现不同空间分布状态,受应力波扰动后液体的运动状态也相异.为阐明应力波作用下水平倾向液体充填岩石节理动态响应规律,利用辉长岩切槽试样、有机玻璃管与丙三醇制备了液体充填岩石节理试样,采用类霍普金森杆试验测试系统,开展了液体充填岩石节理试样的竖向冲击加载试验,考虑了节理匹配系数(JMC)、液体体积分数与黏度3个影响因素,并从应力波透射能量与液体运动2个方面分析了液体充填岩石节理动态响应规律.试验结果表明:液体充填岩石节理JMC增大,应力波透射能量增大;随着液体体积分数增大,高幅低频应力波的透射能量单调增大,低幅高频应力波的透射能量先不变后增大;当液体体积分数为50％时,应力波透射能量随着液体黏度增大而减小,而当液体体积分数为100％时,应力波透射能量随着液体黏度增大呈现先减小后增大的趋势;节理边界处,液体运动方向垂直于水平节理面向上,节理排液能力和液体运动剧烈程度随液体黏度增大而减弱.
Abstract
In underground rock engineering,the liquid-filled rock joints are inevitably subjected to dynamic disturbances such as earthquakes and blasting.The fluidity of liquids leads to distinct spatial distribution patterns within inclined joints under the influence of gravitational forces,while the motion characteristics of liquids are altered upon encountering stress waves.This study aimed to investigate the dynamic response of liquid-filled rock joints with horizontal inclination when subjected to stress wave loading.The rock joint specimens filled with liquid were prepared using the gouged samples of diorite,polymethyl methacrylate tubes,and glycerol.Experimental tests were conducted using a modified Split Hopkin-son Pressure Bar testing system on jointed rock specimens filled with liquid.Three influencing factors,namely,the joint matching coefficient(JMC),liquid content,and viscosity,were considered.The dynamic response of liquid-filled joints was analyzed based on the transmitted energy of stress waves and liquid motion.The results indicated that an increase in JMC of the liquid-filled rock joints leads to a higher transmission of stress wave energy.As the fluid content increases,the trans-mission energy of high-amplitude,low-frequency stress waves shows a monotonic increase,while that of low-amplitude,high-frequency waves initially remains constant,followed by an increase.When the liquid content is 50％,the transmis-sion of stress wave energy decreases with increasing liquid viscosity.However,when the liquid content is 100％,the trans-mission energy shows a trend of initially decreasing and then increasing with increasing liquid viscosity.At the joint boundaries,the direction of fluid motion is perpendicular to the horizontal joint plane and upward.Both the drainage capa-city of the joint and the intensity of fluid motion diminish with increasing fluid viscosity.These findings provide some valuable insights into the interaction mechanism between stress waves and liquid-filled rock joints,contributing to a deep-er understanding of this phenomenon.
关键词
应力波/液体充填/岩石节理/动态响应/透射能量/液体运动Key words
stress wave/liquid-filled/rock joints/dynamic response/transmitted energy/liquid motion引用本文复制引用
基金项目
国家重点研发计划(2022YFC3004602)
国家自然科学基金(52325404)
深圳市基础研究项目(JCYJ20220818095605012)
出版年
2024
NETL
NSTL
维普
万方数据