Abstract
To study the damage evolution of rocks under the action of wet and dry cycles, nuclear magnetic resonance (NMR) technology was used to test red sandstone under different times of wet and dry cycles. The T 2 spectral distribution curve, porosity, spectral peak area, and damage distribution curve of the rock were obtained, and the quantitative relationship between porosity, damage degree, and number of cycles was established. The results show that with the increase of the number of wet and dry cycles, the T 2 spectral curve of rock gradually moves to the right, but the moving amplitude gradually decreases. The porosity and spectral area increase with the increase of the number of wet and dry cycles, coupled with a declining growth rate, and the maximum increase in porosity is 18.789%. The damage degree of rock increase with the increase of the number of cycles, but with the continuous increase of the number of cycles, the damage rate decreases, and finally the damage degree of rock tends to be a constant value.
Highlights
The interaction between water and rock means that water and rock and soil body continuously carry out mechanical, physical, chemical and mechanical actions, and influence the state of rock and soil medium [1]
This problem is one of the basic research subjects of geotechnical engineering and is playing an increasingly important role in solving the environmental pollution and ecological security problems faced by human beings
The climate of Chuxiong Prefecture is a subtropical monsoon climate, the rainy season is from July to October, and it is located in an area with high sunshine value in Yunnan Province
Summary
The interaction between water and rock means that water (surface water, groundwater, and snow water) and rock and soil body continuously carry out mechanical, physical, chemical and mechanical actions, and influence the state of rock and soil medium [1]. Frosch et al [19] proved that NMR method is a noninvasive method for analyzing undisturbed reservoir sandstones with original fluid content; Zhou et al [20] used nuclear magnetic resonance technology to conduct measurement tests on granite to provide a basis for studying the damage mechanism of rock; Li et al [21] analyzed the relationship between NMR porosity and spectral area of freeze-thawed granite and uniaxial compressive strength by using nuclear magnetic resonance system; Sun et al [22] took granite samples from the high-level waste disposal repository in Beishan, Gansu Province, China, as the research object and used the low-field nuclear magnetic resonance system to carry out laboratory experiments on the thermal stability of the granite at the key pre-selected sites; Ren et al [23] carried out cyclic loading and unloading tests on water-saturated sandstone under laboratory conditions and combined acoustic emission technology and nuclear magnetic resonance analysis technology to explore the evolution law of its macro-and microdeformation and fatigue damage. In this paper, a new nondestructive testing method (NMR technology) was used to detect red sandstone with different wetting and drying cycles and analyze its meso-damage and deterioration characteristics, which provided a theoretical basis for the stability of sandstone under the action of water and rock in the future
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