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| Dry-wet damage characteristics and mechanism of metamorphic sandstone carrying Helan mouth¢s rock paintings under different conditions |
| CUI Kai1，2，GU Xin1，WU Guopeng1，LI He1，DU Zhengzu1 |
| (1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；2. Key Laboratory of Mechanics on Disaster and Environment in Western China，Ministry of Education，Lanzhou University，Lanzhou，Gansu 730000，China) |
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Abstract Dry-wet and chemical damages are important reasons that lead to the quickly weathering process of metamorphic sandstone carrying Helan mouth¢s rock paintings following freeze-thaw and chemical damages. The research conducted 15，30，45，60，90，120，150 and 180 dry-wet cycles of rock paintings carrier in different solutions to explore the damage characteristics of rock paintings carrier under the combined action of dry-wet and chemical solutions. The results show that the mass，the longitudinal wave velocity，the uniaxial compressive strength and the stress-strain characteristics of the samples generally present gradual and differential attenuation as the number of dry-wet cycles increases，and the rate of change presents three stages with two obvious inflection points of 15 times and 60 times. SEM and XRD analysis tests were performed to qualitatively analyze the microstructure and composition of the samples，and the quantitative relation between damage variables and macroscopic test indicators was established based on the porosity. Finally，by analyzing the internal damage mechanism，it is found that the differential combination of hydrolysis，chemical corrosion，salt crystallization and dissolution result in the formation of the different number and connection of linear pores and pores in the rock due to different dry-wet conditions，which provides the necessary theory and support for the scientific protection of rock paintings.
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2021, Vol. 40 
