Automatically and rapidly modelling and back analysis of initial geotress field in rock mass

A redevelopment of AutoCAD2008 was done and an object-oriented program was developped that can rapidly and automatically calculate the grid nodes' ground elevations and establish the 3-D finite element model that could reflect the terrain condition.By using 3-D nonliner finite element regression back analysis method,a function of lateral pressure parameter of geostress is put forward and initial geostress field is carried out through 3-D simulation of excavation.The back analysis of initial geostress field of underground house of Pushihe Pumped Storage Power Station is carried out;and the results show that the calculations fitted well with actual geostress and the method is acculate and high-speed and reasonably reflect the influence of landform on initial geostress field.