Abstract:

Initial geostress is indispensable to the design and the construction of rock engineering. Based on the measured data of geostress and engineeringgeological conditions in the region of the Shuangjiangkou hydropower station, a geological model was developed to express the physiognomy of the research area and rock mass structure. The established 3D simplified geological model was calculated by fast Lagrangian analysis for the Continuum of FLAC3D. A multivariate regression model was established between the actually measured and corresponding calculated results of geostresses. According to multiple regression analysis, the optimum regression coefficient can be received. Through the comparison between computed and measured geostress values of measuring points, it was found that they are similar in values and directions,which suggests the accuracy and reasonability of the geostress field. The results offer reasonable geostress field for excavating simulation and analysis of the stability of the underground workshop of the Shuangjingkou hydropower station.

Key words: Shuangjingkou hydropower station; initial geostress; multivariate regression analysis; back analysis