Geotechnical Behavior of Rocks under High Thermal Effect

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Abstract
The effect of under/after high temperature conditions on the thermo-mechanical behaviour of different rocks is extremely important issue for several engineering applications. Changes in the properties of rock after undergoing high temperature may affect stability and even induce engineering disasters. In General, the scope of high temperature ranges from normal temperatures (10-50 ¡C) to high temperatures (1000- 1500 ¡C). Temperature is one of the key factors that influence the microstructure, the physical and mechanical properties for variety of rocks as Granite, Sandstone, Limestone, Mudstone, Marble and Diorite. A review study for vast majority of previous experimental investigations was carried out for some mechanical, physical and thermal properties of rocks, including deformation modulus, Poisson’s ratio, tensile strength and compressive strength all vary considerably with increasing temperatures. Therefore, the results of experimental studies indicated that, behavior of rocks that exposed to high temperatures is different from those under normal temperature conditions. It has been known that rock strength and deformation modulus generally declined with the elevated temperature, especially beyond a certain temperature. Moreover, new correlations for the uniaxial compressive strength (UCS) with Tensile strength (TS) and for Young’s modulus (Es) with uniaxial compressive strength (UCS) due to the elevated temperatures for different types of rocks were presented.

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