基于传递熵的埋藏式压力管道钢管-混凝土间隙参数敏感性分析

Sensitivity Analysis of Steel Pipe-Concrete Gap of Buried Pressure Pipe Based on Transfer Entropy

抽水蓄能电站在国家电网中可以起到调峰填谷的作用,有效提高电网供电质量,实现有限水源的循环利用。该文根据某工程实际数据建立宏观高精细化数值仿真模型,对“围岩—混凝土衬砌—钢管”三者联合承载结构进行参数敏感性分析。在考虑围岩地应力的基础上,将规范解析法计算结果与数值仿真结果对比分析,验证数值模型的准确性。引入传递熵算法计算钢管—混凝土衬砌初始间隙对结构联合承载能力的影响,通过对比围岩分担率变化和熵值变化说明传递熵算法在参数敏感性分析中的可行性,建议钢管—混凝土初始间隙应控制在1 mm以内。进行抽水蓄能电站的压力管道钢管—混凝土间隙参数敏感性分析,可为其设计施工提供一定的参考,并验证传递熵算法进行参数敏感性分析的可行性,为类似分析提供思路。

Pumped storage power station can play the role of peak shaving and valley filling in the national power grid,effectively improve the power supply quality of the power grid,and realize the recycling of limited water sources.A high-precision numerical simulation model with macro meso coupling is established to analyze the parameter sensitivity of the combined bearing structure of“surrounding rock concrete lining steel pipe”.On the basis of considering the in-situ stress of surrounding rock,the calculation results of the standard analytical method are compared with the numerical simulation results to verify the accuracy of the numerical model.The transfer entropy algorithm is introduced to calculate the sensitivity of steel pipe thickness and initial gap.By comparing the change of sharing rate and entropy value,it shows that the transfer entropy algorithm is feasible in parameter sensitivity analysis,and it is better to control the initial gap within 1mm.At the same time,it is concluded that the influence of initial gap change on steel pipe stress displacement is greater than that of steel pipe thickness change.The sensitivity analysis of penstock parameters of pumped storage power station can provide some reference for its design and construction,and introduce the transfer entropy algorithm for analysis,so as to provide ideas for similar analysis in the future.