竖井地基热排水固结模型试验研究

Model test system is firstly designed for thermal shaft drainage consolidation, then tests of thermal drainage consolidation and drainage consolidation are carried out by selecting typical soft clay of Ningbo area in the room temperature and the hydrothermal fluid circulation temperature of 70℃, respectively. The change law of temperature and pore water pressure of each measuring points and ground surface settlement are analyzed for the heating, step loading and cooling (constant load) stage, and the mechanism of thermal drainage consolidation is preliminary elaborated. The test results show that the thermal drainage consolidation method can accelerate the consolidation rate of the ground model, and consolidation time required to achieve the 90% reduction compared with drainage consolidation method significantly. After the temperature history, the final settlement of the surface is increased, shear strength is improved, and the soft ground treatment effect is enhanced.