某水电站拱肩槽高边坡稳定性工程地质分析判断和有限元分析

Engineering Geology and Finite Element Analysis of Spandrel Groove High Slope Stability of A Hydraulic Power Station

为了合理确定某水电站拱肩槽高边坡的开挖坡比,正确评价其稳定性。文章通过现场地质原型调研对拱肩槽高边坡工程地质条件进行定性和定量分析,采用数值模拟计算分析了人工高边坡在自重应力和构造应力场作用下开挖后的应力场和位移场的变化趋势,以及不同工程部位的变形破裂特征,得出了人工边坡在叠加构造应力场作用后,较在自重应力场作用下坡体的应力有所增加,位移增加较大,但总体相差不大;工程边坡开挖后,虽然坡体应力重分布,在坡面和层间错动带附近有拉应力分布,坡脚会出现剪应力集中现象,但坡体的整体位移量不大,无大范围破坏区出现,仅在开挖面及岩体断层带附近发生局部松弛和破坏,工程边坡整体处于稳定状态的结论。

In order to reasonable confirm spandrel groove high slope excavation ration of a hydraulic power station, and accurately evaluate its stability, the paper makes qualitative and quantitative analysis on engineering geology of spandrel groove high slope through field geological prototype research, and analyzes stress and displacement field change trend of artificial high slope alter excavating under Junction of sell - gravity stress and tectonic stress fidd through adopting numerical simulating calculation, as well as deformation and fracture features of different engineering position, thus the conclusion is the stress and displacement of artificial slope under imbricate tectonic stress field function induces some increase compare with self - gravity stress function, but the difference is not evident. After excavating, although slope stress distributing again, tensile stress dtstributes near to slope surface and shear zone of layer and bottom of slope occurs shear stress centralized phenomenon, the whole displacement is not obvious, and has not occurred large - scale destroyed areas, only partial slack and breakage has occurred near to excavating surface and fault zone of rock mass, the whole engineering slope is stable, the paper provides some reference for the similar engineering.