不同加载速率下煤系砂岩力学特性与微观形貌  

Mechanical properties and microscopic morphology of coal measures sandstone under different loading rates

作　　者：赵春俊 王鲁男 杨磊[2] ZHAO Chunjun;WANG lu nan;YANG Lei(Dongying Kenli District Vocational Secondary Professional School,Dongying 257000,China;Liaoning Petrochemical University,Fushun 113001,China)

机构地区：[1]东营市垦利区职业中等专业学校,山东东营257000 [2]辽宁石油化工大学,辽宁抚顺113001

出　　处：《四川建材》2025年第4期122-124,共3页Sichuan Building Materials

摘　　要：在煤炭开采过程中,煤系砂岩处在一种动态水-力环境中。通过饱水试验、单轴压缩试验及扫描电镜试验,探讨不同加载速率下含水煤系砂岩的力学性质参数、断口形貌特征的变化规律。结果表明,随着加载速率的增大,试样的峰值强度和弹性模量均呈现上升趋势,微观断裂模式从沿晶断裂逐渐向穿晶断裂演化;含水率的增大使得试样的力学特性呈现衰减的规律,表面颗粒间的胶结材料明显松动,损伤更为剧烈。In the process of coal mining,the coal measures sandstone is in a dynamic hydro-mechanical environment.The water saturation test,uniaxial compression test and scanning electron microscope test were carried out to explore the changes in the mechanical parameters and fracture morphology of the water-bearing coal measures sandstone under different loading rates.The results show that with the increase of loading rates,the peak strength and elastic modulus of the specimens show an increasing trend,and the microscopic fracture mode gradually evolves from along-crystal fracture to through-crystal fracture.In addition,the increase of water content results in a decay pattern of the mechanical properties.The cementing material between the surface particles is obviously loose,and the damage is more intense.

关 键 词：加载速率 含水状态 力学特性 微观形貌 

分 类 号：TU45[建筑科学—岩土工程] TD315[建筑科学—土工工程]