基于关联规则挖掘的混凝土坝温控方案优化

Optimization of the temperature control scheme of concrete dams based on association rule mining approach

【目的】混凝土坝施工期温控措施反馈设计要求在较短时间内提出每个拟筑仓的个性化温控措施建议,确保指导现场施工的时效性。然而,已有反馈设计方法中的参数调整环节主要依赖计算人员的专业知识和工程经验,不利于提高温控措施反馈设计效率。【方法】应用关联规则挖掘理论,揭示常用温控措施对混凝土坝温控效果的影响程度。结合溪洛渡高拱坝工程,建立了温控数据的关联规则挖掘模型,对坝体一冷控温、一冷降温和中冷降温三个阶段的温控措施参数与温度控制指标之间的关联规则进行挖掘,得出了两者之间的定量关系。【结果】结果表明,在一冷控温阶段:(1)混凝土浇筑温度需要控制在11~12℃之间;(2)平均进口水温需要控制在7.5~9.5℃之间;(3)平均通水流量需要控制在27~35 L/min之间。此外,在一冷降温和中冷降温阶段,平均进口水温需要控制在14~16℃之间,平均通水流量需要控制在16~22 L/min之间。【结论】研究揭示了溪洛渡工程浇筑仓混凝土温控指标与温控措施之间的关联关系,便于工程师合理决策,为混凝土坝施工期温控措施反馈设计时科学高效调整参数提供参考依据,为溪洛渡工程的混凝土温控作出了一定贡献。

[Objective]The Feedback Design(FD)of temperature control measures during the construction period of a concrete dam require that the individual temperature control measures for each planned dam block for pouring should be proposed in a short period of time to ensure the timeliness of the on-site construction guidance.However,the parameter adjustment steps in the FD process mainly rely on the personnel,professional knowledge,and engineering experience of the computing staff,which is not conducive to improving the FD efficiency.[Methods]In this study,association rule mining theory is applied to reveal the influence degree of common temperature control measures for the temperature control effect of a concrete dam.An association rules mining model for the temperature control data is established based on the Xiluodu high arch dam project.The association rules between the temperature control parameters and the temperature control index of the dam in the initial cooling stage and the temperature-dropping period of the middle cooling stage are mined,and the quantitative relationships are obtained.[Results]The results show that in the temperature control period of the initial cooling stage:(1)the concrete pouring temperature needs to be controlled between 11~12℃,(2)the average inlet water temperature needs to be controlled between 7.5~9.5℃,and(3)the average water flow needs to be controlled between 27~35 L/min.Additionally,in the temperature dropping periods of both the initial cooling stage and the middle cooling stage,the average inlet water temperature needs to be controlled between 14~16℃and average water flow needs to be controlled between 16~22 L/min.[Conclusion]The discovered knowledge indicates relationships between the temperature control indexes and temperature control measures in pouring blocks for the Xiluodu high arch dam that enable the engineers to make reasonable decisions,which provides a reference for the scientific and efficient adjustment of the temperature control measures and makes some contributions during the construction period of the Xiluodu high arch dam.