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某工程在软弱基础上修建的碾压混凝土拱坝坝高大于100m,基础软弱,应力和位移大,尤其是坝肩向下游位移大。提出设置推力墩新结构来增强拱座受力,限制其变形。示例对水压荷载作用下坝体的应力和位移进行三维仿真分析,表明仅设置30m长的推力墩能消减50％的坝体下游面(水压荷载)拱向拉应力;位移减小20％;坝肩基岩几乎处于微压状态,水压应力向推力墩转移,加大坝基底面减小坝体沉陷。由于推力墩结构减小了拱跨度,增强了拱坝的整体性,分担了主要的坝肩荷载,可使拱坝应力得到改善,位移得到控制。
The dam height of a RCC arch dam constructed on the basis of weakness is larger than 100m. The foundation is weak, and the stress and displacement are large. In particular, the displacement of dam abutment is large downstream. Proposed to set up a new thrust pier structure to enhance the abutment force limit its deformation. The three-dimensional simulation analysis of the stress and displacement of the dam under the hydraulic load shows that only 30m long thrust pier can reduce the arch tensile stress to the downstream face of the dam (hydraulic load) by 50%; the displacement decreases by 20% ; Abutment bedrock almost in a micro-pressure state, hydraulic stress transferred to the thrust pier, increase the dam basement surface to reduce the dam settlement. As the thrust pier structure reduces the arch span, enhance the integrity of the arch dam, share the load of the main dam shoulder, arch dam can be improved stress, displacement control.