Evaluation of Cumulative Damage of Sandstone under Cyclic Wetting and Drying through Acoustic Wave Parameters and Resistivity Testing

Abstract

This paper carries out cyclic wetting and drying experiments on the sandstones from the bank slope of an inland port, and explores the deterioration features and acoustic wave parameters and resistivity (AWPR) of the sandstone. The variations in P-wave velocity, attenuation coefficient, nonlinear coefficient, resistivity, and other indices with the cycle number were discussed in details. Then, the correlations between P-wave velocity, resistivity, and physical-mechanical indices were analyzed based on the experimental results. Through the analysis on instantaneous damage analysis, a cumulative damage model was proposed, in the light of the AWPR. The results show that: the evolution of sandstone resistivity can accurately reflect the deterioration features of the sandstone under cyclic wetting and drying, providing a desirable tool to characterize rock strength deterioration and internal damage changes. Taking cycle number into account, the proposed theoretical model for cumulative damage can derive the damage and deterioration of sandstone excellently. By this model, the AWPR at any moment can be acquired in real time on site, which is convenient for engineering application.

Deterioration of Physical and Mechanical Properties of Rocks by Cyclic Drying and Wetting

“…The determination method for the parameters in the proposed damage model was also introduced. He et al [96] explored the deterioration features and acoustic wave parameters and resistivity (AWPR) of the sandstone in cyclic wetting and drying experiments and proposed a cumulative damage model in the light of the AWPR through the instantaneous damage analysis. Huang et al [97] investigated the physical and mechanical properties under In shale gas development and other engineering practices, the study of rock mass diffusion and seepage equations is very important [100][101][102].…”