Study the correlation between microstructural features and geotechnical properties of collapsing soil at elevated temperatures

Abstract

This study explores the consequences of elevated temperatures on the geotechnical and microstructural properties of collapsible soil. Through a lab-scale setup, geotechnical characteristics were accurately investigated within a temperature range spanning from 50 °C to 200 °C. The focus was on understanding how temperature fluctuations, in conjunction with varying water contents, influence layer spacing, macropores, mesopores, and surface tension – all of which are integral in forming collapsible soil structures. The assessment involved an evaluation of microstructural properties for natural soil and soil subjected to temperatures, with specific attention to a 10% water content condition. The microstructure, identified as a critical determinant in soil collapse, was the primary focus of this study. The impact of high temperatures was probed, reaching up to 200 °C, on soil X-ray diffraction (XRD) responses and permeability efficiency. Higher temperatures were observed to produce smaller particles, leading to reduced pore sizes and a denser soil structure, a phenomenon validated through spectroscopic research. These findings were congruent with the geotechnical data, which indicated an enhancement in soil collapse resistance, maximum dry density, and overall geotechnical properties. Our study stresses elevated temperatures' significant effect on the microstructural and geotechnical facets of collapsible soil. These findings provide valuable insights into the behavior of collapsing soil under varying temperature conditions, contributing to a deeper understanding of this complex phenomenon.