The Studying Of Artificial Frozen Soil's Thaw Settlement Character And Forecasting Model

According to geotechnical testing methods standards (GB/T 50123-1999), the author developed a set of testing devices that can perform frozen swollen experiment and thaw settlement experiment of artificial frozen soil. The frozen swollen testing devices are composed of specimen boxes, thermostatic box, temperature control system, temperature monitoring system, supply water system, deformation monitoring systems, pressure system and can perform frozen swollen experiment under the conditions of different temperatures, different water content, different dry density, different pressure and different freezing conditions. By the frozen swollen testing devices we can discover the relationship between the rate of frozen swollen and soil category, dry density, temperature, water content, pressure, freezing conditions and establish the corresponding models. The melt settlement testing devices are composed of pressing and heating cover plate, specimen boxes, thermostatic box, temperature control system, temperature monitoring system, deformation monitoring systems and pressure system. Aiming at three kinds of soil of Nanjing region—silt clay, mealy clay and mealy sand—the paper selected refrigeration temperature, water content, dry density and pressure as four factors to perform different levels singer-factor tests and orthogonal tests at the self-developed testing devices and found the influence laws that refrigeration temperature, water content, dry density and pressure have on all kinds of melt settlement coefficient and thaw compression factor. The paper shows that silt clay,...