黑龙江科技大学学报2024，Vol.34Issue(4)：517-522,6.DOI:10.3969/j.issn.2095-7262.2024.04.004
冻融红砂岩的微观孔隙结构与损伤特征
Microscopic pore structure and damage characteristics behind freeze-thaw red sandstone
摘要
Abstract
This paper intends to investigate the microscopic pore structure and damage characteristics behind red sandstone under freeze-thaw action.By using freeze-thaw cycle test,mercury injection test and numerical simulation,the study explores the variation laws behind pore volume,porosity and frost heave stress on the freeze-thaw red sandston,and obtains the macro and micro damage characteristics behind freeze-thaw red sandstone by using the frost heave stress and porosity as parameters.The results show that with the increase of the freeze-thaw times,the mineral particles at both ends of the red sandstone speci-men fall off apparently,the damage in the middle part increases gradually,the internal porosity of the specimen evolves and expands continuesly with the increase of the pore volume of large pores,and the ex-ponential function relationship exists between porosity and freeze-thaw times;with the increase of freeze-thaw times,the frost heave stress of red sandstone increasse continuesly,and the relationship between frost heave stress and the freeze-thaw times follows a cubic polynomial relationship.The distribution range of the frost heave stress at both ends gradually expands,and the freeze-thaw damage starts from both ends and then extends to the middle region,as which is basically consistent with the apparent damage results after freeze-thaw.With the increase of freeze-thaw times,the macro and micro damage variables of red sandstone continue to increase,and basically consistent with the change law.关键词
冻融循环/微观孔隙结构/孔隙度/表观损伤/热应力Key words
freezing-thawing cycle/microscopic pore structure/porosity/apparent damage/thermal stress分类
建筑与水利引用本文复制引用
兰永伟,高宏伟,刘朋飞,张恒..冻融红砂岩的微观孔隙结构与损伤特征[J].黑龙江科技大学学报,2024,34(4):517-522,6.基金项目
黑龙江省省属高等学校基本科研业务费项目(2023-KYYWF-0533) （2023-KYYWF-0533）
