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干湿循环条件下泥质砂岩细观损伤特性研究

发表时间:2014-07-31  浏览量:1504  下载量:734
全部作者: 刘新荣,张梁
作者单位: 重庆大学土木工程学院
摘 要: 以砂岩为研究对象,运用细观颗粒流(particle flow code, PFC)数值软件进行干湿循环交替作用三轴压缩模拟研究,获得砂岩应力-应变曲线,并分析其变形破坏特征。相对于没有经过干湿交替作用的干燥试件,经过不同次数的干湿循环作用后,砂岩的弹性模量有不同程度的降低。运用连续损伤力学理论分析干湿循环对岩石变形的影响,初步建立岩石细观损伤演化方程。结果表明:对砂岩进行细观参数损伤分析,可以为宏观工程实际提供数值参考。
关 键 词: 水利工程基础学科其他学科;干湿循环;泥质砂岩;损伤;颗粒流
Title: Msoscopic damage characteristic research of argillaceous sandstone under dry-wet cycles
Author: LIU Xinrong, ZHANG Liang
Organization: School of Civil Engineering, Chongqing University
Abstract: A series of uniaxial compression simulation tests on sandstone under dry-wet cycle have been carried out using particle flow code (PFC) soft. The corresponding complete stress-strain curves are obtained and characteristics of deformation and failure are analyzed. Compared with the dry specimens, elastic modulus, uniaxial compressive strengths of the specimens under “dry-saturation” cycling are all decreased to some degree. The effects of dry-wet cycle on rock strength and deformation are analyzed by theories of darnage mechanics. Through introducing the volumetric change caused by rock dilatancy to the darnage variable, the evolution equation of darnage of rock meeting with water is established, which is closely related to rock stress state. The results show that by microscopic analysis of the sandstone damage, this research can actually provide a reference value for the macro works.
Key words: other subject of basic science of water conservancy project; dry-wet cycle; argillaceous sandstone; damage; particle flow code
发表期数: 2014年7月第14期
引用格式: 刘新荣,张梁. 干湿循环条件下泥质砂岩细观损伤特性研究[J]. 中国科技论文在线精品论文,2014,7(14):1461-1468.
 
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