Modelling the thermal–hydro-mechanical behaviour of unsaturated soils with a high degree of saturation using an extended precise integration method

Unsaturated soils with a high degree of saturation (HDS) are commonly encountered in marine and lacustrine sediments. In these soils, the gas phase generally exists state discrete bubbles, which is sensitive to stress temperature changes can dramatically change soil's engineering properties. This paper explores thermal-induced behaviour HDS using an efficient extended precise integration method (XPIM). Biot poroelasticity theory, include thermal effects compressibility gas–water mixture, employed analyze soil under non-isothermal conditions. Based on Laplace–Fourier transform Taylor series expansion, such problems be solved by XPIM. The robustness XPIM was confirmed comparing present results analytical solutions test data. Extensive parametric studies undertaken examine both grain expansion anisotropic permeability ( S r ). variations more pronounced lower initial values (e.g., 90% compared 99%). These quantitative demonstrate benefits proposed method, proves extremely several orders than conventional numerical approaches, its precision limited only computational effort used.