陕西煤炭2026，Vol.45Issue(1)：19-26,8.DOI:10.20120/j.cnki.issn.1671-749x.2026.0104
不同剪切角度下不同粒度砂岩力学响应机制差异性研究
Mechanical response mechanism difference of sandstone with different particle sizes under different shear angles
摘要
Abstract
In order to explore the mechanical response mechanism of sandstone under different particle sizes and shear an-gles,Sigma 300 scanning electron microscope and MTS universal testing machine were used to carry out 9 groups of mechan-ical tests with different shear angles on three rock samples of medium sandstone,fine sandstone and siltstone with different particle sizes,and the mechanical response mechanism of sandstone under different shear angles was analyzed.The results show that:With the decrease of sandstone particle size,the shear strength increases significantly.The peak strength of fine sandstone and siltstone is 63.27%and 89.55%higher than that of medium sandstone,respectively.The peak strength of shear stress shows a"Z"type change trend with the increase of shear angle,and the shear strength of fine sandstone is 14.93 MPa,which is the most affected by shear angle.In addition,the turning point of sandstone peak strength moves for-ward with the decrease of particle size,and the turning angles of fine sandstone and siltstone are 0°～10° and 20°～30° earlier than those of medium sandstone,respectively.In the process of shear failure of sandstone,with the decrease of sand-stone particle size,the increase of elastic energy of rock sample increases from 0.39 to 1.1,and the brittleness index increa-ses from 0.42 to 0.55.The research results can provide a basis for the study of surrounding rock control technology of mine roadway.关键词
粒径/微观结构/剪切角度/强度变化趋势/砂岩抗剪特性Key words
particle size/microstructure/shearing angle/strength change trend/shear properties of sandstone分类
矿业与冶金引用本文复制引用
CAO Zhongzong,MING Fang,HU Fanghong,HAN Guohui,QIN Jianyun,YANG Fajun..不同剪切角度下不同粒度砂岩力学响应机制差异性研究[J].陕西煤炭,2026,45(1):19-26,8.基金项目
2023阿克苏地区科技兴阿项目(2023KJXA07) （2023KJXA07）
新疆维吾尔自治区重点研发专项项目(2022B01034) （2022B01034）
