Weathering of petroglyph carrier surfaces in Baiyin under coupled wet-dry and chemical effects
KONG Xiangchao1, 2, HE Faguo1, 2*, XIE Mingyu1, 2, GUO Sirui1, 2, LU Tengfei1, 2, MA Yunfeng1, 2,YANG Xingjie1, 2, LV Xuemeng1, 2, ZHANG Lizhi1, 2
(1. School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, Gansu 730000, China; 2. Key Laboratory of Mechanics on Disaster and Environment in Western China of Ministry of Education, Lanzhou University, Lanzhou,
Gansu 730000, China)
Abstract：The Baiyin petroglyph carrier, influenced by thermodynamic cycles and hydrochemical processes, has developed a composite degradation mode characterized by fractures, bulging, warping, and peeling. Through laboratory-simulated dry-wet cycling experiments, aligned with the actual environmental conditions at the petroglyph site, a quantitative top-dripping method was employed to replicate the precipitation infiltration-lateral migration process that drives the water-rock interface reactions responsible for the chemical weathering of the petroglyphs. Systematic monitoring of the evolution of sample indicators across different cycle periods reveals the differential impact of dry-wet cycles on the weathering process of sandstone surfaces under varying environmental conditions. The results indicate that, under different environmental conditions, the number of dry-wet cycles is significantly positively correlated with the degree of degradation of the sample′s physical properties. The weathering of the carrier is primarily driven by the combined effects of expansion, salt crystallization, and dissolution, leading to changes in both the macroscopic and microscopic structure and mineral content of the sample surface. A weathering damage model is established based on the evolution of the sample′s pore rate, facilitating the quantitative characterization of surface damage under varying environmental stresses.
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2026, Vol. 45 
