击实和三轴压缩条件下炭质泥岩的颗粒破碎及力学响应研究
Investigation of particle fragmentation and mechanical response of carbonaceous mudstone under percussive and triaxial compression conditions
摘要
Abstract
To investigate the particle crushing behaviour and mechanical properties of carbonaceous mudstone,the triaxial shear tests on teh fragmentation degree of carbonaceous mudstone with different coarse grain mass fractions were carried out under the best compaction condition,the influence of stone mass fraction on the particle size gradation and mechanical properties of carbonaceous mudstone were analyzed,and the relationship between the particle crushing of carbonaceous mudstone and the surrounding pressure and coarse grain mass fraction was clarified.The results show that the water sensitivity of carbonaceous mudstone is much greater than that of the soil-stone mixture of hard rock,the compaction curve is steeper,and compaction state is the best when the coarse grain mass fraction is 60%.With the increase of coarse grain mass fraction,the shear strength of carbonaceous mudstone shows a trend of first increasing and then decreasing.When the coarse grain mass fraction is 60%,the cohesive force reaches the maximum,and the internal friction is negatively related to the coarse grain mass fraction.When the coarse grain mass fraction is low,the shear strength of the carbonaceous mudstone is mainly provided by the cohesive force of the fine grains and the occlusal force of the coarse and fine grains,and the coarse grains are less broken.With the increase of the coarse grain mass fraction,the broken grains in the specimen are more obvious,and the internal friction is increased by the redistribution and occlusion of the grains.The shear strength is provided by the coarse grain fragmentation and the coarse grain-fine grain occlusion,and the cohesive force of the fine grains is smaller.The relative fragmentation rate of carbonaceous mudstone increases with the increase of surrounding pressure and coarse grain mass fraction,and there is a non-linear relationship between the relative fragmentation rate and coarse grain mass fraction and surrounding pressure.关键词
路堤工程/炭质泥岩/颗粒破碎/力学特性/相对破碎率Key words
embankment engineering/carbonaceous mudstone/particle fragmentation/mechanical properties/relative fragmentation rate分类
建筑与水利引用本文复制引用
刘琼,曾铃,查焕奕,陈佳艳,卞汉兵..击实和三轴压缩条件下炭质泥岩的颗粒破碎及力学响应研究[J].中南大学学报（自然科学版）,2024,55(3):1120-1131,12.基金项目
国家自然科学基金资助项目(52078067,52078066) （52078067,52078066）
湖湘青年科技创新人才项目(2020RC306) （2020RC306）
湖南省自然科学基金杰出青年基金资助项目(2023JJ10045) （2023JJ10045）
长沙市杰出创新青年培养计划项目(kq2206030) （kq2206030）
长沙理工大学"双一流"科学研究国际合作拓展项目(2019IC04) （2019IC04）
桥梁工程安全控制教育部重点实验室开放基金资助项目(15KB01)(Projects(52078067,52078066)supported by the National Natural Science Foundation of China （15KB01）
Project(2020RC306)supported by the Youth Scientific and Technological Innovation Talents Program of Hunan Province （2020RC306）
Project(2023JJ10045)supported by the Outstanding Youth Fund of the Natural Science Foundation of Hunan Province （2023JJ10045）
Project(kq2206030)supported by the Outstanding Innovative Youth Training Program of Changsha City （kq2206030）
Project(2019IC04)supported by the"Double First-class"International Cooperation and Expansion Program for Scientific Research of Changsha University of Science&Technology （2019IC04）
Project(15KB01)supported by the Open Fund of Key Laboratory of Bridge Engineering Safety Control,Ministry of Education) （15KB01）
