Experimental study on seepage–corrosion coupling characteristics of a single fracture in limestone subjected to acid mine drainage

IF 3.3 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2024-12-31 DOI:10.1016/j.gete.2024.100633

Jing Liu , Shuangying Zuo , Yunchuan Mo

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引用次数: 0

Abstract

To investigate the influences of the acid mine drainage (AMD) in a closed coal mine on the corrosion and seepage stability of limestone with rough fractures, both distilled water and AMD solution were employed to implement seepage-corrosion tests on the seven sets of a single fracture of limestone specimens under different hydraulic conditions. We investigated the effects of confining stress and solution on the seepage parameters. Also, the mechanism of seepage reduction of fractured limestone caused by AMD solution was proposed. Moreover, COMSOL numerical software was used to simulate the chemical-seepage coupling field characteristics of a rough fracture under condition 4. The results are as follows: (1) The permeability, the Ca²⁺ concentration gradually decreases, and the osmotic stress, the total iron concentration gradually increases during the seepage process. (2) Differences between the bedding and matrix corrosion exist, the roughness of the fracture surface decreases, and “passivation” occurs on the surface, which makes the permeability decrease rapidly in the early stages and stabilize later. (3) The real-time permeability of fractured limestone under high confining stress is smaller than that under low confining stress and the sensitivity of permeability decreased with the increase of confining stress. (4) The numerical simulated results show the diffusion area of the solution on the fracture wall expands with increasing seepage-corrosion time and osmotic stress of the entrance section. This work will be of great significance to guide the treatment of AMD and the stability analysis of engineering rock masses.

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来源期刊

Geomechanics for Energy and the Environment Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

5.90

自引率

11.80%

发文量

期刊介绍： The aim of the Journal is to publish research results of the highest quality and of lasting importance on the subject of geomechanics, with the focus on applications to geological energy production and storage, and the interaction of soils and rocks with the natural and engineered environment. Special attention is given to concepts and developments of new energy geotechnologies that comprise intrinsic mechanisms protecting the environment against a potential engineering induced damage, hence warranting sustainable usage of energy resources. The scope of the journal is broad, including fundamental concepts in geomechanics and mechanics of porous media, the experiments and analysis of novel phenomena and applications. Of special interest are issues resulting from coupling of particular physics, chemistry and biology of external forcings, as well as of pore fluid/gas and minerals to the solid mechanics of the medium skeleton and pore fluid mechanics. The multi-scale and inter-scale interactions between the phenomena and the behavior representations are also of particular interest. Contributions to general theoretical approach to these issues, but of potential reference to geomechanics in its context of energy and the environment are also most welcome.