复杂层状高陡岩质边坡变形与稳定性研究

我国西南地区坡高谷深,蕴含着丰富水能资源的同时,高陡岩质边坡变形与稳定问题亦相对突出。以乌东德水电站右岸厂房进水口边坡为例,重点研究层状岩质工程边坡变形与稳定问题,以及工程边坡对环境边坡变形与稳定性的影响。该处边坡结构复杂,顺向坡、斜向坡、横向坡、反向坡均有分布,不同边坡结构坡段变形破坏模式差异明显。在地质条件详细调查的基础上,分析不同边坡结构坡段变形破坏特征,并以此为依据进行有针对性的个性化设计。此外,工程边坡的开挖对上部环境边坡稳定性的不利影响也应予以足够的重视。充分考虑工程边坡开挖后顺层滑移、顺层倾倒等作用对上部环境边坡的变形影响,有针对性地提出了"先环境边坡变形影响区支护,后工程边坡开挖"的设计理念,治理效果在数值模拟中表现明显,实际效果将在边坡施工完成后得到进一步验证。本研究成果可为工程建设提供技术支持,亦为类似工程提供借鉴。

Study on deformation and stability of complex layered high and steep rock slope

Deep valley with high slope in southwest China contains abundant hydropower resources, while deformation and stability problems of the high and steep rock slope are relatively serious. In this paper the high slope at the intake of right bank powerhouse of the Wudongde Hydropower Station is taken as an ex- ample, focusing on deformation and stability problems of the layered rock slope and there effects on the surrounding slope deformation and stability. The structures of high slope in this case are very complex,dis- tributing with dip slope, diagonal slope, transverse slope and reverse slope, and segments with different slope structures may have different failure modes. On the basis of detailed geological investigation, the fail- ure characteristics for segments with different slope structure were analyzed, and a targeted design were made accordingly. Besides that, the adverse effects of excavation on the stability of the upper surrounding slope should also be paid enough attention to this kind of problem. Considering the impacts of bedding-slip and bedding toppling after excavation on the deformation of the upper surrounding slope, a design idea of "support surrounding slope deformation zone at first, and then excavate engineering slope" was put forward. The numerical simulation result shows good effect of the governance, which will be verified further in the construction. This paper provides technical support for engineering construction, which can be a reference for similar projects.