Pore-Water Pressure and Shear Characteristics of Lateritic Clay under Different Temperature Paths

The thermal-induced pore-water pressure and shear characteristics of lateritic clay under different temperature paths without drainage are studied through a series of temperature-controlled undrained triaxial shear tests with temperatures ranging from 5°C to 50°C. The effects of different temperature paths under undrained conditions on pore-water pressure and shear behavior are discussed. The results indicate that monotonic heating and multistage heating have equivalent effects on the accumulation of pore-water pressure when the initial temperature and target temperature are the same. The initial positive pore-water pressure induced by heating leads to a lower bearing capacity during the early stage of the shearing process. The secant elastic modulus (εa = 0.1%) shows a significant decrease with increasing temperature, suggesting that mechanical properties at small strains are influenced by temperature. However, undrained heating has no influence on the shear strength finally. Furthermore, under undrained conditions, temperature variations do not alter the unique relationships among void ratio, deviator stress, and mean effective stress.