Fracture Mechanical Behavior of Sandstone Subjected to High-Temperature Treatment and Its Acoustic Emission Characteristics Under Uniaxial Compression Conditions

An analysis of the physical–mechanical properties and acoustic emission (AE) characteristics of rock following high-temperature treatment provides theoretical guidance for detecting thermal stability in underground engineering under high-temperature conditions. The physical and mechanical properties of rock, including density, wave velocity, porosity, peak strength, elastic modulus, and deformation modulus, change after subjection to hightemperature treatment (Tian et al. 2012; Ozguven and Ozcelik 2013; Wang et al. 2015). The internal composition and structure of rock materials under such conditions undergo complex physicochemical changes, eventually resulting in cracking by thermal expansion (Chmel and Shcherbakov 2015). Sandstone is a common sedimentary rock, used in a broad array of geotechnical engineering applications and present in many coal mines (Tian et al. 2012; Zhu et al. 2016). AE technology can help deepen our understanding of deformation and fracture of rock materials after high-temperature treatment. Because of differences in mineral composition and structure, previous studies have not reported on differences in AE time domain characteristics and the spatial evolution of sandstones. In this work, we studied the differences in physical–mechanical properties and AE characteristics during deformation and fracture of thermally damaged sandstone. Uniaxial compression tests were carried out, while simultaneously monitoring AE signals. The time & Enyuan Wang weytop@263.net