BACK REGRESSION ANALYSIS OF 3D INITIAL GEO-STRESS FIELDAT THE REGION OF XIAOWAN HYDROPOWER STATION

摘要

The basic factors influencing the initial geo-stress field at the dam site are firstly analyzed incombination with engineering geological and the topographic conditions at the region of Xiaowanhydropower station. Under the independent action of each basic factor, 3D FE model is then developed andcalculated with general FE program MSC.MARC. Based on the stress regression method of observed data,the regression effects of 9 cases of basic factor combinations are compared to each other. The horizontalcompressed tectonic movement field is simulated by mixed compression load for the substitution oftraditional uniform compress boundary load, and results show that the model is greatly improved inprecision and it can simulate the initial geo-stress field more properly.