GEO-STRESS DISTRIBUTION AND UNLOADING FRACTURING MECHANISM OF HIGH ROCK SLOPES IN WESTERN PART OF CHINA

High geo-stress and its reduced epigenetic fracturing during unloading process has great significance to the rock engineering in southwestern China because of the exists of local high geo-stress in this area. The basic laws summarized as 3 basic models about regional geo-stress distribution and so called "camel type distribution" of a typical rock slope are revealed in this paper. Based on a lot of field evidences related to geo-stress release in rock slope, the author concludes the near surface fracturing accompanying with a river's cutting down or surface excavation as 4 epigenetic recreation conceptual models. The formation mechanism and engineering geological significance of these models are also discussed in this paper.