干湿循环对红砂岩力学与微结构的影响研究  

The impact of dry-wet cycles on the mechanical properties and microstructure of red sandstone

作　　者：黄雪琪 Huang Xueqi(Guangdong Chemical Geological Exploration Institute,Guangzhou Guangdong 510800,China)

机构地区：[1]广东省化工地质勘查院,广东广州510800

出　　处：《山西建筑》2024年第17期93-96,共4页Shanxi Architecture

摘　　要：为了研究干湿循环对红砂岩力学性能的影响及机理,开展不同循环次数下的红砂岩力学试验,结合扫描电镜试验结果分析微观结构变化。试验结果表明:干湿循环作用造成红砂岩力学特性的显著下降,随着循环从0次增加至200次的过程中,红砂岩的抗压强度、弹性模量逐渐衰减;随着干湿循环次数增加,红砂岩内部孔隙的数量不断增加,尺度不断扩大;由微观形态图像发现红砂岩内部结构在循环次数增加过程中出现孔隙扩大现象,压实密度不断降低。该研究为天然条件下岩石的环境损伤机理的深入认识提供科学参考。In order to study the influence of dry and wet cycles on the mechanical properties of red sandstone and its mechanism,mechanical tests of red sandstone with different cycles were carried out,and the microstructure changes were analyzed according to the results of scanning electron microscopy.The test results show that the mechanical properties of red sandstone decrease significantly due to dry and wet cycling,and the compressive strength and elastic modulus of red sandstone decrease gradually with the cycle increasing from 0 to 200 times.With the increase of dry and wet cycles,the number and scale of internal pores in red sandstone increase continuously.It is found from the microscopic morphology images that pore expansion occurs in the internal structure of red sandstone during the process of increasing the number of cycles,and the compaction density decreases continuously.This study provides scientific reference for the in-depth understanding of environmental damage mechanism of rocks under natural conditions.

关 键 词：红砂岩 干湿循环 强度 微观机理 

分 类 号：TU452[建筑科学—岩土工程]