Abstract
Some geological engineering problems are caused by weathering of black shale within dispersed sulfide minerals (mainly pyrite), in which some weathering products such as acid water and expansive sulfates play an important role. These effects are essentially manifested through oxidation of sulfide minerals. Complex chemical reactions occur simultaneously and influence mutually in water-rock interaction process. Chemical weathering of black shale is a factor leading to engineering problems such as landslides and acid corrosion. The objectives of present study are to understand the process of water-rock interactions between black shale and water. The semi-immersion simulation experiment is mainly used to explore the chemical weathering characteristics of black shale under natural conditions.
Highlights
Black shale interacts closely with environmental water, where sulfide minerals are highly sensitive to oxidizing environments and tend to form acidic products during oxidation
Based on the physicochemical properties, microscopic morphological characteristics and formation conditions of weathering products of black shale, this paper combines field investigation and indoor immersion experiment to focus on the chemical weathering behavior of black
4.1 Microscopic morphological characteristics Electron microscope and SEM were used to analyze the microscopic characteristics of the weathering products precipitated on the surface of the black shales in the semi-immersion experiment
Summary
Black shale interacts closely with environmental water, where sulfide minerals are highly sensitive to oxidizing environments and tend to form acidic products during oxidation. The predecessors carried out a large number of indoor model experiments to analyze the characteristics of water-rock interaction. Chemical weathering of black shale was analyzed by immersion experiment using crushed rock samples by Wu [2]. The leaching experiment conducted by Bai was used to analyze the changes in physical properties of the rock mass and the chemical reaction between the infiltrated acidic water and rock [3]. Based on the physicochemical properties, microscopic morphological characteristics and formation conditions of weathering products of black shale, this paper combines field investigation and indoor immersion experiment to focus on the chemical weathering behavior of black. Fissure water samples were collected adjacent to black shales
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