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结合某碾压混凝土拱坝的拱座,在减弱和加强侧约束时,即在坝体部分高程的破碎软弱岩石减弱坝体侧约束以及坝体下游边墙和护坦增强坝体侧约束的情况下,研究侧约束对于坝体应力和位移的影响。从仿真计算结果可以看出,减弱侧约束时,坝体会自动地进行应力调整,实现坝体的应力重分布,不会产生应力的集中;同时由于拱向应力的增大,即增大了抗剪面剪应力,抵消了坝体下游破碎岩石的影响。而增强侧约束,可以减少坝体位移,特别是坝肩位移。
Combined with the abutment of a certain RCC arch dam, when weakened and strengthened the lateral constraints, that is, the weak and weak rocks at the elevation of the dam weaken the constraints on the dam body side, Under the influence of lateral constraint on the stress and displacement of the dam, From the simulation results, it can be seen that when the lateral restraint is weakened, the dam will automatically adjust the stress to realize the stress redistribution of the dam without concentration of stress. At the same time, due to the increase of stress in the arch, Shear shear stress, offset the impact of broken rock downstream of the dam. The enhanced lateral constraint can reduce the displacement of the dam, especially the displacement of the dam.