Experimental study on mesostructural damage evolution of sandstone subjected to freeze-thaw cycling under uniaxial compression

被引:7
作者
Liu, Hui [1 ,3 ]
Han, SenLei [1 ]
Yang, GengShe [1 ]
Zhang, Yuan [2 ]
Yu, JinJie [1 ]
Feng, ZongXin [1 ]
机构
[1] Xian Univ Sci & Technol, Sch Architecture & Civil Engn, Xian 710054, Shaanxi, Peoples R China
[2] Northwest Elect Power Design Inst CO LTD, China Power Engn Consulting Grp, Xian 710075, Shaanxi, Peoples R China
[3] Xian Univ Sci & Technol, Coll Architecture & Civil Engn, 58 Yanta Middle Rd, Xian 710054, Shaanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
Freeze -thaw cycling; Nuclear magnetic resonance; Uniaxial compression; Acoustic emission; Sandstone damage; PORE STRUCTURE; NMR;
D O I
10.1016/j.rcar.2022.12.007
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
In perennially frozen or seasonally frozen soil regions, freeze-thaw cycling adversely impacts the mechanical properties of rock mass, resulting in landslides, rock erosion, and other geological disasters. The microscopic damage evolution law of loaded sandstone under the freeze-thaw cycle is analyzed by conducting Nuclear Magnetic Resonance (NMR) and uniaxial compression acoustic emission (AE) experiments. The experimental results have shown that: (1) Freeze-thaw cycling increases sandstone's internal pores, enlarges the pore size, and modifies the original pore distribution. (2) The damage due to freeze-thaw cycling is positively correlated with the initial damage to the rock, and the damage on the rock surface is more severe than inside the rock sample. (3) Freeze-thaw cycling negatively impacts the mechanical properties of sandstone, and the elastic deformation stage of sandstone gradually decreases as the number of freeze-thaw cycles increases and gradually transitions from brittle failure to ductile failure. (4) The characteristic parameters of AE ringing count and accumulated energy can reveal the severity of freeze-thaw damage and the dynamic evolution process, and the damage development rate exhibits abrupt changes at critical moments. After five freeze-thaw cycles, the damage development rate rises suddenly, as manifested by a sharp increase in the frequency and energy of AE events. High-energy AE events frequently occur during the rapid expansion period of damage, which can be adopted as an essential reference for damage propagation and aggravation.
引用
收藏
页码:317 / 328
页数:12
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