examine some of the physico-mechanical properties of the Jiaozuo Sandstone after exposure. The regression coefficients between long-period radon concentration and barometric pressure are -1.5 kBq m(-3) hPa(-1) in the summer and 5 kBq m(-3) hPa(-1) in the winter months. The mechanical properties of the rock under examination are discussed before the results of the thermo-mechanical response of the sandstone are presented and analysed. Key Eng Mater 274276:883888. CrossRef Google Scholar Zhang Y, Zhang X, Zhao Y (2005) Process of sandstone thermal cracking.
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The average particle size was maximum at 40C. J Struct Geol 27:265281. Exp Mech 20(4 628634. Doi:.1029/2001GL013321, sosman RB (1965) The phases of silica. Also play an important role in the radon concentration variation. CrossRef, google Scholar, hughes DS, Cross JH (1951) Elastic wave velocities in rocks at high pressures and temperatures. Chin J Geophys 48(3 656659 Google Scholar Zoldners NG (1971) Thermal properties of concrete under sustained elevated temperatures. Fire Technol 38(4 373382. In the summer and winter periods the variability does not change. It was also observed that the average particle size was time dependent. Geological Society of America, New York, pp 39104. Rutgers University Press, New Jersey.
The mechanical properties considered include the stressstrain response, the uniaxial compressive strength, the modulus of elasticity and the Poissons ratio. References, david C, Menndez B, Darot M (1999) Influence of stress-induced and thermal cracking on physical properties and microstructure of La Peyratte granite. Principal Component Analysis of the raw data was performed to investigate the yearly, summer and winter variability of the radon concentration, temperature and barometric pressure. J Geol vol 44:541577.