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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

40卷

期数:

2023年04期

页码:

153-162

栏目:

岩土工程

出版日期:

2023-07-10

文章信息/Info

Title:

Research on damage characteristics of freeze-thawed red sandstone based on uniaxial compression and SEM experiments

文章编号:

1673-2049(2023)04-0153-10

作者:

张 娜^1,2,赵伟征^1,2,罗水亮^1,2,王帅栋^1,2,王若晨^1,2,李显亮²

(1. 中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京 100083; 2.中国矿业大学(北京)力学与建筑工程学院,北京 100083)

Author(s):

ZHANG Na^1,2, ZHAO Weizheng^1,2, LUO Shuiliang^1,2, WANG Shuaidong^1,2, WANG Ruochen^1,2, LI Xianliang²

(1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China; 2. School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China)

关键词:

红砂岩;  冻融循环;  力学性能;  孔隙结构特征

Keywords:

red sandstone;  freeze-thaw cycle;  mechanical property;  pore structure characteristic

分类号:

TU458

DOI:

10.19815/j.jace.2022.04082

文献标志码:

A

摘要:

为研究冻融循环作用对岩石力学性能及微观结构的影响,以饱和红砂岩试样为研究对象,进行了不同冻融循环次数(0、5、10、15、20、30次)的冻融循环试验。通过单轴压缩试验,分析红砂岩试样在冻融循环作用下的力学性能变化规律; 通过扫描电镜(SEM)试验,并借助Image-Pro Plus图像分析软件,定量地表征不同冻融循环次数下损伤岩石微观孔隙结构变化; 最后基于岩石的损伤理论定量分析冻融循环红砂岩的损伤劣化特性。结果表明:在整个冻融循环过程中,红砂岩试样的质量变化率呈现出先增加后减小的趋势; 随着冻融循环次数的增加,其单轴抗压强度、弹性模量和泊松比均逐渐降低; 在冻融循环作用下,红砂岩试样表面颗粒剥落且胶结程度降低,颗粒间孔隙逐渐增大,微裂纹萌发、扩容、连通; 随着冻融循环次数的增加,孔隙结构愈发均匀,表现为分形维数随冻融循环次数的增加逐渐减小; 试验中的红砂岩抗冻性较差,其抗冻系数和冻融损伤程度随冻融循环次数变化较为明显,两者均可通过指数函数进行拟合; 该研究对于寒区工程建设中衡量砂岩宏微观特性具有一定的参考价值。

Abstract:

In order to study the effect of freeze-thaw cycles on mechanical properties and microstructure of rock, saturated red sandstone samples were taken as the research object, and freeze-thaw cycle experiments with different number of freeze-thaw cycles(0,5,10,15,20,30)were carried out. The variation of mechanical properties of red sandstone samples under freeze-thaw cycles was analyzed through uniaxial compression test. Through scanning electron microscopy(SEM)experiment, and with the help of Image-Pro Plus image analysis software, the changes of microscopic pore structure of damaged rock under different freezing and thawing cycles were quantitatively characterized. Finally, the damage degradation characteristics of freeze-thaw cycle red sandstone were quantitatively analyzed based on rock damage theory. The results show that the mass change rate of red sandstone samples increases first and then decreases during the whole freeze-thaw cycle. With the increase of freeze-thaw cycles, the uniaxial compressive strength, elastic modulus, and Poisson's ratio decrease gradually. Under the action of the freeze-thaw cycle, the particles on the surface of red sandstone sample are exfoliated and the degree of cementation is reduced. The pores between particles gradually increase, and the micro-cracks germinate, expand and connect. In addition, as the number of cycles increases, the pore structure becomes more uniform, showing that the fractal dimension decreases gradually with the increase of freeze-thaw cycles. The red sandstone in the test has poor frost resistance, and the frost resistance coefficient and freeze-thaw damage degree change significantly with the number of freeze-thaw cycles. Both can be fitted by the exponential function. This study has a certain reference value for measuring the macro and micro characteristics of sandstone in cold area engineering construction.

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备注/Memo

备注/Memo:

收稿日期:2022-04-21
基金项目:国家自然科学基金青年科学基金项目(41502264); 中央高校基本科研业务费专项资金项目(2021YJSSB10); 中国矿业大学(北京)大学生创新训练项目(C202106013)
作者简介:张 娜(1978-),女,工学博士,副研究员,博士生导师,E-mail:zhangn@cumtb.edu.cn。

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更新日期/Last Update: 2023-07-01