Effects of Water and Cyclic Loading on Ultrasonic and Mechanical Properties of Sandstone: An Experimental Study

Yan Chen, Guolong Zhang, Erhu Bai, Baohua Guo and Rong Dou
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Yan Chen: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Guolong Zhang: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Erhu Bai: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Baohua Guo: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Rong Dou: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China

Energies, 2022, vol. 15, issue 21, 1-16

Abstract: In this study, the water absorption, mechanical properties, and energy evolution characteristics of sandstone were examined through experimental and theoretical analysis. The P-wave velocity was found to initially decrease, then increased with immersion time and water content. The water absorption rates of three sandstone specimens decreased with immersion time and water content. The post-peak deformation of the sandstone changed from brittle failure to strain softening. With the increase in water content, the peak strength and loading Young’s modulus per cycle decreased. The loading Young’s modulus showed that the unloading stress and increment of unloading stress nonlinearly increased with the number of cycles and decreased before peak strength. With the increase in the number of cycles, residual strains of the sandstone specimens decreased slightly initially and then increased, while the elastic strains increased before peak strength and then decreased at the post-peak stage. With the increase in unloading stress, the energy densities nonlinearly increased. At the same unloading stress, an increase in water content led to an increase in the input energy density and energy ratios of the sandstone specimens.

Keywords: water content; P-wave velocity; strength; young’s modulus; residual strain; energy density (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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