Modeling Experimental Study On The Influence Of Environmetal Factors Upon Temperature Field And Moisture Field In Expansive Soil Slope

This essay aimed at the representative expansive soil in Nanning, Guangxi. To build an expansive soil slope model. Using the environment generator, to simulate the environment temperature, air relative humidity and the rainfall. To observe the distribution and alteration laws in the expansive soil slope model, under the environmental factors changing. At the mean time, to observe and describe the fissures, displacements in the soil slope model.The environment temperature, air relative humidity and the rainfall have influenced inner of the slope soil's thermal transfer and temperature change. At a moderately high temperature and humidity, the soil's inner temperature change velocity was faster. After rainfall, the temperature change velocity in the inner slope model was changed. The environment temperature, air relative humidity was the same, but the temperature change velocity was slower after the rainfall. Only changing the environment temperature, air relative humidity and the rainfall, the influence depth of the inner slope soil's temperature field is about 0.8m, and the temperature change range was wider under the soil surface 0.5m. With the increasing depth, the effect of temperature hysteresises was distinct.The environment temperature, air relative humidity and the rainfall had a great effect on the slope soil's inner temperature field. The depth that was influenced environment temperature and air relative humidity on slope soil's inner moisture was about 0.5m.The biggest range of soil moisture was 3.5%. The rainfall had a bigger impact on the soil moisture change; the depth of influence was about 1.0m. The biggest range of soil moisture that was influenced by rainfall was 5.5%The environment temperature and air relative humidity had a great impact on the slope model fissure developing, the widest fissure was 6mm and the deepest fissure was 6cm. The environment temperature and air relative humidity had a small impact on the soil's surface displacement. According with the increase of cycles of dry-wet process, the types of fissure had changed. The developing of fissure accelerates the rainwater's permeation and made the slope surface displacement grown gradually. At last, it made the slope surface soil saturated and loosening.According to this modeling test, we have got lots of useful data and accumulated experience. It is significant for later modeling experiments and research.