基于矿物溶解理论的砂岩化学损伤动态模型

doi:10.11896/cldb.22080206

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Abstract The deterioration of the physical and mechanical properties of rock under an acidic environment is essentially caused by the dissolution of rock minerals and further the expansion and penetration of pores and microcracks.To study the dissolution characteristics of sandstone minerals in an acidic environment, pH=1, 3 HCl solution was selected as the corrosive environment.The composition and content of sandstone minerals were identified by X-ray diffraction test, and the pH value of the solution, cation concentration, mass, and longitudinal wave velocity of samples were tested under different immersion periods.The dynamic chemical damage model for sandstone reflecting the corrosion process was established based on the mineral dissolution theory and chemical kinetic principle.The results show that the damage of sandstone in an acidic environment was mainly caused by the dissolution of feldspar and calcite.The mineral dissolution can be divided into three steps:interface adsorption, interface exchange, and desorption, and the slowest one plays a controlling role.The dissolution rate was proportional to the nth power of the H⁺ concentration, and the value of n (0＜n≤1) was related to the properties of minerals and the pH value of the solution.The acid-rock reaction was time-dependent;the reaction rate decreased with the corrosion time and tended to be stable.The sandstone deteriorated more seriously with the lower pH value and longer corrosion time.Under the action of pH=1, 3 HCl solution, the change laws of sandstone porosity with corrosion time, obtained by the chemical damage model, was in good agreement with that obtained by the longitudinal wave velocity, which verified the validity and rationality of the model built in the study.The finding can provide theoretical references for safety assessment and disaster prevention of rock mass engineering under an acidic environment.

Key words： sandstone mineral dissolution chemical damage model porosity longitudinal wave velocity

Published: 25 April 2024 Online: 2024-04-28

CLC number:

TU451

Fund:National Natural Science Foundation of China (41172237,52178393) and Open Fund of State Key Laboratory of Frozen Soil Engineering (SKLFSE202107).

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	Articles by authors
	LIANG Yanling
	HUO Runke
	SONG Zhanping
	MU Yanhu
	QIU Tian
	SONG Ziyi

Cite this article:

LIANG Yanling,HUO Runke,SONG Zhanping, et al. Dynamically Chemical Damage Model for Sandstone Based on Mineral Dissolution Theory[J]. Materials Reports, 2024, 38(8): 22080206-7.

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https://www.mater-rep.com/EN/10.11896/cldb.22080206 OR https://www.mater-rep.com/EN/Y2024/V38/I8/22080206

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