高陡边坡深部卸荷张拉裂缝的成因机制探讨

在高地应力地区，一些特定的高陡边坡，其内部发育有大量的深部张拉裂缝，水平深度可达200 ~300 m，甚至更深，超出了工程经验中对卸荷改造规律的认识，合理解释这一特殊的工程地质现象成为工程地质学的新课题。通过对前人研究成果的分析和总结，从边坡岩体的赋存环境、岩体结构和地质构造等方面，对深部张拉裂缝的成因机制进行了进一步的探讨。从现阶段的研究结果看，这种深部卸荷张拉裂缝对边坡稳定性只是产生局部的影响，但这些深部裂缝在内动力作用或充水的条件下，裂缝可能会进一步扩大发展，对边坡的稳定性起到控制作用。

Discussion on genetic mechanism of large-depth unloading tension fracture in high and steep slope

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.