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水库蓄水引起枢纽区产生抬升变形的现象在国内外水利工程中比较少见。为了解岩体水文地质结构对抬升变形的影响,通过对国内外文献研究,提出了坝基及近坝库岸边坡产生抬升变形的水文地质结构模式:即坝址区存在倾向下游或两岸的相对隔水层,且相对隔水层下存在透水性较大的水文地质结构层。采用流固耦合数值分析方法研究了相对隔水层产状要素变化对抬升变形空间分布规律的影响。研究结果表明:相对隔水层在上游库区的出露区域至坝体距离越近,下游岸坡抬升变形范围越大,抬升变形量也越大;随着相对隔水层倾向下游倾角的增大,枢纽区最大抬升位移呈先增大后减小的变化规律;隔水层倾向角的变化将引起抬升变形空间分布位置的变化。
Reservoir water caused by the hub zone uplift deformation phenomenon at home and abroad are relatively rare in hydraulic engineering. In order to understand the effect of hydrogeologic structure of rock mass on uplift and deformation, a hydrogeological structural model of uplift and deformation induced by the dam foundation and near bank dam bank is put forward through literature research both at home and abroad: Impermeable layer, and there is a relatively water-permeable hydro-geological structure layer below the aquitard. Fluid-solid coupling numerical analysis method was used to study the influence of the change of relative aquifer layer elements on the distribution of uplift deformation. The results show that the closer the riser zone to the dam body in the upstream reservoir area, the greater the range of uplifting and deforming of the downstream bank slope and the greater the amount of uplifting deformation. With the increase of the relative inclination of the riser The maximum lift displacement of large and hub areas first increases and then decreases. The change of dip angle of aquitards will change the location of the spatial distribution of uplift deformation.