摘要
为研究片岩在干湿循环作用下的微观损伤特性,对不同干湿循环作用下云母石英片岩试样进行核磁共振测试,并定量分析其损伤变量变化规律。结果表明:不同干湿循环作用下云母石英片岩孔隙之间连通性较好,孔径较小孔隙集中发育,随着干湿循环次数的增加,孔径逐渐扩展增大;云母石英片岩孔径发育具有关联性,干湿循环5次前小孔、中孔数量增加较快,5~10次循环后小孔数量趋于饱和,部分中孔发育扩展为大孔,导致中孔数量减少,大孔数量从5次干湿循环后开始显著增加;云母石英片岩受干湿循环影响损伤明显,损伤变量曲线在前5次干湿循环作用下近似呈直线上升,试样内部孔隙、裂隙发育扩展较快,5次干湿循环后,孔隙、裂隙的大小和数量发育减缓,云母石英片岩损伤变量增速逐渐变缓。
In order to study the micro-damage characteristics of mica quartz schist under different dry-wet cycles,nuclear magnetic resonance tests were carried out to quantitatively analyze the variation of damage variables.The results show that the pores of mica quartz schist have good connectivity under different dry-wet cycles,and the pores with small pore size develop intensively.With the increase in dry-wet cycles,the pore size expands and increases gradually.The pore size development of mica quartz schist is correlated.The number of small and medium pores increases rapidly before the 5th dry-wet cycles,and tends to be saturated after the 5th~10th cycles,while some medium pores continue to develop and expand into large pores,resulting in a decrease in the number of medium pores,and the number of large pores increases significantly after the 5th dry-wet cycles.The damage variable curve of mica quartz schist is obviously affected by the dry-wet cycle,and the damage variable curve approximately linearly rises under the action of the first 5 dry-wet cycles,and the development and expansion of pores and cracks inside the sample are fast.After the 5th dry-wet cycle,the development of the size and number of pores and cracks slows down,and the growth rate in damage variables of mica quartz schist gradually slows down.
作者
张钟文
李志刚
徐光黎
郭霞
周烨
代云云
ZHANG Zhongwen;LI Zhigang;XU Guangli;GUO Xia;ZHOU Ye;DAI Yunyun(College of Architectural Science and Engineering,Yangzhou University,Yangzhou 225127,China;Nuclear Industry Huzhou Survey Planning&Design Institute Co Ltd,Huzhou 313000,China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)
出处
《土木工程与管理学报》
2024年第4期92-98,共7页
Journal of Civil Engineering and Management
基金
国家自然科学基金(41772314)
江苏省高等学校自然科学研究项目(20KJB170020
21KJB570010)
湖北省科技厅重点研发项目(2021BCA219)。
关键词
干湿循环
云母石英片岩
核磁共振
损伤特性
dry-wet cycle
mica quartz schist
nuclear magnetic resonance
damage characteristic
作者简介
张钟文(1996-),男,江苏南通人,硕士研究生,研究方向为岩石力学(Email:zhongwensp@163.com);通讯作者:李志刚(1988-),男,河北张家口人,博士,讲师,研究方向为岩土力学(Email:lzgdyy@yzu.edu.cn)。
