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Effects of Thermal Treatment on the Dynamic Mechanical Properties of Coal Measures Sandstone

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Abstract

Many projects such as the underground gasification of coal seams and coal-bed methane mining (exploitation) widely involve the dynamic problems of coal measures sandstone achieved via thermal treatment. This study examines the dynamic mechanical properties of coal measures sandstone after thermal treatment by means of an MTS653 high-temperature furnace and Split Hopkinson pressure bar test system. Experimental results indicate that 500 °C is a transition point for the dynamic mechanical parameters of coal measures sandstone. The dynamic elastic modulus and peak strength increase linearly from 25 to 500 °C while the dynamic peak strain decreases linearly over the same temperature range. The dynamic elastic modulus and peak strength drop quickly from 500 to 800 °C, with a significant increase in the dynamic peak strain over the same temperature range. The rock mechanics are closely linked to material composition and mesoscopic structure. Analysis by X-ray diffraction and scanning electron microscopy indicate that the molecules inside the sandstone increase in density due to the thermal expansion of the material particles, which effectively improves the deformation resistance and carrying capacity of the sandstone and reduces the likelihood of axial deformation. With heat treatment that exceeds 500 °C, the dynamic mechanical properties rapidly weaken due to the decomposition of kaolinite; additionally, hot cracking of the mineral particles within the materials arises from coal sandstone internal porosity, and other defects gradually appear.

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Acknowledgments

Financial support for this work was provided by the National Basic Research Program of China (No. 2013CB227900), The National Science Fund for Excellent Young Scholars (No. 51322401), Project supported by National Natural Science Foundation for Young (No. 51304200, 51304201 and 51104128), Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20120095110013), Colleges and Universities in Jiangsu Province Plans to Graduate Research and Innovation (No. KYLX14_1371).

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  1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Ming Li, Xianbiao Mao, Lili Cao, Hai Pu, Rongrong Mao & Aihong Lu

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  1. Ming Li
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  2. Xianbiao Mao
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Correspondence to Xianbiao Mao.

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Li, M., Mao, X., Cao, L. et al. Effects of Thermal Treatment on the Dynamic Mechanical Properties of Coal Measures Sandstone. Rock Mech Rock Eng 49, 3525–3539 (2016). https://doi.org/10.1007/s00603-016-0981-5

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