溢流面板坝泄槽锚杆设计参数敏感性分析

针对设锚杆的溢流面板坝泄槽流激振动性能复杂的特点,建立拟三维仿真模型,采用时域分析法对锚杆设计参数的敏感性进行了研究。结果表明:在一定的水流限制流速条件下(v≤40 m/s),在影响溢流面板坝流激振动性能的3个锚杆设计参数中,锚杆布设间距对关键点的拉应力和接缝处法向变形响应幅值影响最大,锚杆布设长度及直径影响相对较小。大致规律为:关键点的应力随锚杆布设间距和锚杆直径的增加而增大,随布设长度的增大而减小;关键点的法向变形随板后布设长度和锚杆直径的增加而增大,随锚杆布设间距的增加而减小;3种因素存在显著性顺序:锚杆布设间距,布设长度,锚杆直径。研究成果可为同类坝型泄槽锚杆参数的设计提供指导。

Sensitivity analysis on design parameters of discharge channel anchors of overflow concrete-faced rockfill dam

Aiming at the complexity of flow-induced vibration in anchored discharge channel of overflow concrete-faced rockfill dam, a three-dimensional simulation model was established to carry out sensitivity analysis to the anchor design parameters by time domain analysis. The results show that under the condition of the flow velocity v≤40 m/s, in the three anchor design parameters that affect the flow-induced vibration performance of the dam, the anchor′s interval has the most influence on the tensile stress and normal deformation of the specified points besides the minor influences of anchor′s buried length and diameter. The general rule is that the stress at the key point increases with the increase of the interval and diameter, while it decreases with the increasing of the buried length; the normal deformation at the key point increases with the increasing of the buried length and the diameter, and it decreases with the denser interval. There is a significant sequence of the three factors: buried space > buried length > diameter. The research results can provide guidance for the design of the anchor parameters of spillway channels.