In-situ stress field analysis based on multi-source information integration

Based on data mining and feature extracting of the source data of the in-situ stress field's characters, and combined with the technology of multi-source information integration, the analytical method of multi-source information integration for in-situ stress field is proposed. And the method is organized by three gradational steps: the first time of multi-source information integration for the source data of the in-situ stress field's characters→calculation of multi-source information integration→the second time of integration, feedback information integration. The calculation of multi-source information integrationis is carried out combining with uniform design and hybrid algorithm of simulated annealing and particle swarm optimization. This method is applied to simulate the in-situ stress field of Baihetan hydropower station, and the calculated results are consentaneous with the testing results. Meanwhile, the rock-core disking phenomenon when drilling and spalling phenomenon in the testing tunnel during excavation is compared with calculated results. It is shown that the proposed analytical method of multi-source information integration for in-situ stress field from the two sides of stress's magnitude and azimuth, is reasonable and practicable.