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【目的】闸门井结构是抽水蓄能电站引水系统的重要永久建筑物，椭圆断面闸门井具有优越的结构力学特性，然而，当前关于椭圆断面闸门井结构设计参数尚无规范化取值标准。为了明确椭圆断面闸门井结构设计参数对其结构性能的影响，保障闸门井的安全性，【方法】采用正交试验法设计试验方案，开展了闸门井结构力学特性参数敏感性分析研究。建立了闸门井结构有限元数值模型，以闸门井最大应力与结构变形为力学特性评价指标，以井筒断面离心率、井筒与井座衬砌厚度为设计参数，依据数值分析结果进行结构参数敏感性分析，研究各参数影响性规律，并对比分析最优参数方案与原方案的结构分析结果。【结果】结果显示：在各结构设计参数中，井座衬砌厚度对椭圆断面闸门井的最大变形及应力的极差值均为最大，井座衬砌厚度越大，闸门井最大变形与应力幅值越小。根据上述结论，进一步研究了椭圆断面闸门井优化设计方案。当各结构参数按基准值增加20%取值时，闸门井各项力学特性评价指标最优。优化后的椭圆断面闸门井井筒最大变形减少20%,井座最大变形减少19.61%,井筒最大拉应力减少44.16%,井筒最大压应力减少28.57%,井座最大拉压力减少18.09%,井座最大压应力减少19.42%。【结论】结果表明：井座衬砌厚度对椭圆断面闸门井力学特性的敏感性最高，适当增加井座衬砌厚度能够有效降低椭圆断面闸门井最大变形及应力。研究成果可为椭圆断面闸门井结构设计提供一定的理论技术支持。
Abstract：[Objective]The gate well structure is an important permanent building of the pumped storage power station diversion system, and the elliptical section gate well has superior structural mechanical properties.In order to clarify the influence of the structural design parameters of the elliptical section gate well on its structural performance and to guarantee the safety of the gate well, [Methods]the orthogonal test method was used to design an experimental scheme and conducts a sensitivity analysis study of the mechanical characteristics parameters of the gate well structure.The numerical finite element model of the valve well structure was established, and the maximum stress and structural deformation of the valve well were taken as indices for evaluating the mechanical characteristics, and the eccentricity of the drilling section and the thickness of the borehole and well seat lining were taken as design parameters, and the sensitivity analysis of the structural parameters was carried out according to the result of the numerical analysis, the law of influence of each parameter was studied, and the result of the structural analysis of the optimal parameter scheme and the original scheme were compared and analyzed.[Results]The results show that among the influencing factors, the maximum deformation and stress of the elliptical section gate well are the largest in terms of the extreme difference between the thickness of the well seat liner and the stress, and the larger the thickness of the well seat liner, the smaller the maximum deformation and stress amplitude of the gate well.According to the above conclusion, the optimized design scheme of the elliptical section gate well was further studied. When each structural parameter is increased by 20% according to the base value, the evaluation index of each mechanical characteristic of the gate well is optimal.The optimized elliptical section gate well has 20% reduction in maximum wellbore deformation, 19.61% reduction in maximum seat deformation, 44.16% reduction in maximum wellbore tensile stress, 28.57% reduction in maximum wellbore compressive stress, 18.09% reduction in maximum wellbore tensile stress, and 19.42% reduction in maximum wellbore compressive stress.[Conclusion]It is concluded that the seat liner thickness has the highest sensitivity to the mechanical properties of elliptical section gate wells, and increasing the seat liner thickness can effectively reduce the maximum deformation and stress of elliptical section gate wells.
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基本信息:
DOI：10.13928/j.cnki.wrahe.2023.11.005
中图分类号:TV743;TV663
引用信息:
[1]杜柏,李芬花,徐超.基于正交试验法的椭圆断面闸门井结构力学特性参数敏感性分析[J].水利水电技术(中英文),2023,54(11):53-65.DOI:10.13928/j.cnki.wrahe.2023.11.005.
基金信息:
国家自然科学基金项目(U2106224); 中央高校基本科研业务费专项资金资助(2023MS073)