关键词: 高地应力, 高陡边坡, 卸荷, 深部张拉裂缝, 成因机制, 边坡稳定性

Abstract:

In high geo-stress area, many deep tension fractures developed in the inside of some high and steep slope with horizontal depth of 200 to 300 m or even deeper, which is beyond the understanding of unloading laws in practical experience. So a reasonable explanation of this special engineering and geological phenomenon becomes a new subject. The genetic mechanism of tension fracture in deep unloading condition is further discussed on the basis of the analysis and summary of previous research results, in terms of around environment, rock structure and geological tectonics. The results in current stage showed that the tension fracture in deep unloading condition can partially affect the slope stability; the fracture would develop and expand under inner force or water filling condition, so as to control the stability of the slope.

Key words: high geo-stress, high and steep slope, unloading, deep tension fracture, genetic mechanism, stability of slope