含水状态下弱风化泥质粉砂岩冲击破碎的分形规律研究.pdfVIP

Journal of Engineering Geology 工程地质学报 10〇4-9 5/2〇16/24( 4 ) -0597-07 DOI ： 10.13544/ki.jeg.2016.04.014 含水状态下弱风化泥质粉砂岩冲击破碎的分形规律研究 黄 明 ® 邱继业® 詹 金 武 苏 燕 ® 谢秀栋® (①福州大学土木工程学院福州350108) (②北京交通大学土木建筑学院北京100044) 摘要水对岩石的物理力学性质影响较大,研究不同含水状态下岩石受冲击荷载后破碎物的分形规律具有较强的现实意 义。借助于分离式霍普金森杆(SHPB )实验装置，开展不同含水状态的泥质粉砂岩的冲击试验，然后对破碎物的块度分布进 行深人分析，并基于尺寸- 频率分析方法,重点对破碎物颗粒粒径分布的分形规律进行探讨。结果表明，随着加载速率的提 高，泥质粉砂岩冲击破碎物单块体积普遍减小,残留碎块的数量越多，破碎的程度也越高,此时分形维数越小；含水率越大，小 颗粒比例越大，岩样破碎程度越高，饱水状态岩样的分形维数较其他两种状态大,天然含水状态和自然吸水状态岩样冲击破 碎的分形维数较为接近；当冲击速度较大时其将成为影响分形维数的主要因素，含水率的影响相对较小。 关键词泥质粉砂岩含水率块度分布分形规律 中图分类号:TU 452 文献标识码 ：A FRACTAL LAW OF WEAK-WEATHERED ARGILLACEOUS SILTSTONE WITH DIFFERENT WATER CONTENTS SUBJECTED TO SHPB IMPAC CRUSHING HUANG Ming① QIU Jiye① ZHAN Jinwu①② SU Yan① XIE Xiudong① l ① College of Civil Engineering， Fuzhou University， Fuzhou 350108) l ② School of Civil Engineering Architecture， Beijing Jiatong University， Beijing 100044) Abstract Water has a great influence on the physical and mechanical properties of the rock. It is very important to investigate the fractal law of rock crushed under impact load at different moisture contents. Using the Split Hopkinson Pressure Bar(SHPB ) ,the impact tests of argillaceous siltstone with different water contents are carried out. The fragmentation distribution of the broken rock is thoroughly presented. According to the method of Size- Frequency , the fractal law of particle size distribution is analyzed. It shows that, the higher the impact velocity, the larger the volume of the singe fragments, the more the amount of the fragments of argillaceous siltstone, the smaller the fractal dimension. The greater the moisture content, the greater the proportion of small particles, the higher the degree of crushing. The fractal dimension of water-saturated rock i