Study on Creep Parameters and Long-Term Strength of White Sandstone under the Coupling Effect of Chemical Corrosion and Temperature

Yong Wang; Qin Xu; Ye Zhou; Jiahong Wang; Mo Xiao; Guifei Wang

doi:10.6911/

Authors

Yong Wang School of Science, Qingdao University of Technology, Qingdao, 266520, SD, PR China
Qin Xu School of Science, Qingdao University of Technology, Qingdao, 266520, SD, PR China
Ye Zhou School of Science, Qingdao University of Technology, Qingdao, 266520, SD, PR China
Jiahong Wang School of Science, Qingdao University of Technology, Qingdao, 266520, SD, PR China
Mo Xiao School of Science, Qingdao University of Technology, Qingdao, 266520, SD, PR China
Guifei Wang School of Science, Qingdao University of Technology, Qingdao, 266520, SD, PR China

DOI:

https://doi.org/10.6911/

Keywords:

White sandstone; instantaneous strain; steady-state creep rate; long-term strength; temperature–chemical coupling.

Abstract

To quantitatively analyze the influence of coupled chemical corrosion and temperature effects on the creep characteristic parameters of white sandstone, the instantaneous strain, steady-state creep rate, and long-term strength were extracted based on uniaxial stepwise loading creep tests. The results indicate that under acidic or alkaline environments, the instantaneous strain and steady-state creep rate at each loading level gradually increase with rising temperature, exhibiting minor variations within the range of 0–50 °C but showing a significant increase after 75 °C. Under neutral environments, both parameters increase slowly. At the same temperature, the instantaneous strain and steady-state creep rate rank in the order of acidic > alkaline > neutral conditions. The long-term strength is approximately 70 % of the instantaneous strength and decreases with increasing temperature, with a more pronounced decline after 75 °C; the lowest long-term strength is observed under acidic conditions. Temperature primarily affects the creep parameters by accelerating the rate of chemical reactions, and the deterioration of creep parameters induced by chemical corrosion and temperature effects exhibits a mutually reinforcing and superimposed promoting effect. This study provides a basis for the environmental impact assessment of rock creep parameters.

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