Study of the Microstructure Characteristics of Three Different Fine-grained Tailings Sand Samples during Penetration

Abstract

This paper explores the microstructural evolution characteristics of tailings sand samples of different types of infiltration failure during the infiltration failure process. The homemade small infiltration deformation instrument is used to test the infiltration failure characteristics of the tailings sand during the infiltration failure process. Evolutionary characteristics of the internal microstructure pores and particle distribution were also studied. Using CT (computerized tomography) technology to establish digital image information, the distribution of the microscopic characteristics of the particle distribution and pore structure after tailing sand infiltration were studied. Microscopic analysis was also performed to analyze the microscopic process of infiltration and destruction, as well as to see the microscopic structural characteristics of the infiltration and destruction of the total tailings. The test results show that there are obvious differences in the microstructure characterization of fluid soil and piping-type infiltration failures. Microstructure parameters have a certain functional relationship with macrofactors. Combining the relationship between macrophysical and mechanical parameters and microstructural parameters, new ideas for future research and the prevention of tailings sand infiltration and failure mechanisms is provided.

Testing of Materials and Elements in Civil Engineering

“…The paper by [ 21 ] explores the microstructural evolution characteristics of tailings sand samples from different types of infiltration failure during the infiltration failure process. A homemade small infiltration deformation instrument is used to test the infiltration failure characteristics of the tailings sand during the infiltration failure process.…”

“…Microstructure parameters have a certain functional relationship with macro factors. Combining the relationship between macrophysical and mechanical parameters and microstructural parameters, new ideas for future research and the prevention of tailings sand infiltration and failure mechanisms are provided [ 21 ].…”

Experimental Study of Mesostructure Deformation Characteristics of Unsaturated Tailings with Different Moisture Content

“…The changes in the mesostructure of the tailings under load cause their macroscopic deformation and destruction as well as changes in the mechanical properties, which are the predominant causes for tailings dam failure [34]. However, the existing studies on the mesoscopic nature of tailings were mainly performed under saturated conditions using physical experiments [35][36][37] or discrete element method (DEM) numerical simulations [38]. Few studies reported the mesostructure evolution of unsaturated tailings particles under load.…”