Abstract
This study concerns the influence of chemical corrosion and geometric parameters on the macroscopic damage characteristics of brittle limestone containing a kinked fissure under uniaxial compression. The specimens are prepared in chemical solutions with different NaCl concentrations and pH values. The acoustic emission (AE) technique is adopted to detect the inner distortion of the failure behaviour. The physical process of the crack coalescence of kinked fissures is synchronously captured by a high-speed camera. Seven failure patterns are identified based on the final failure mode and the failure process. Furthermore, the stress intensity factor of kinked cracks under chemical corrosion is obtained by a theoretical analysis. Chemical erosion with an acidic solution has a relatively strong effect on the compressive strength of the tested specimen, while the initial crack angle is not affected by short-term chemical corrosion.
Highlights
Mechanics and Failure Behaviour of Natural rocks contain a large number of cracks and joints with irregular geometries, which are usually exposed to complex environments such as groundwater, rivers and oceans
These irregular cracks and chemical corrosion essentially determine the coalescence behaviour and mechanical behaviour of the rock, which are of great significance for assessing safety in rock engineering
In the past several decades, related research has mainly focused on two aspects, i.e., the influence of straight cracks on the coalescence behaviour of rock and the effect of chemical corrosion on the mechanical behaviour of rocks
Summary
Mechanics and Failure Behaviour of Natural rocks contain a large number of cracks and joints with irregular geometries, which are usually exposed to complex environments such as groundwater, rivers and oceans. Long-term contact between rock surfaces and different aqueous solutions causes the rock surface to become susceptible to chemical corrosion. These irregular cracks and chemical corrosion essentially determine the coalescence behaviour and mechanical behaviour of the rock, which are of great significance for assessing safety in rock engineering. It is of great practical significance to study the effect of chemical corrosion on the mechanical behaviour of rocks with pre-existing fissures under compression. In the past several decades, related research has mainly focused on two aspects, i.e., the influence of straight cracks on the coalescence behaviour of rock and the effect of chemical corrosion on the mechanical behaviour of rocks
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