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基于正交试验土石坝热-流耦合模型参数的敏感性分析
张文兵1, 任 杰1, 杨 杰,等1
西安理工大学 水利水电学院,省部共建西北旱区生态水利国家重点实验室
摘要:
【目的】研究热-流耦合模型参数的敏感性,减小运行期土石坝热-流耦合模型参数校正过程的工作量,为土石坝热-流耦合模型参数选取提供依据。【方法】采用正交试验法,以某水库土石坝为例,基于大坝热-流耦合模型,以坝体与坝基平均温度作为敏感性分析的主要指标,对大坝热-流耦合模型各参数的敏感性进行分析。【结果】渗透率和土体比热容对土石坝温度场影响较敏感,其极差值分别为0.124 5和0.086 2,其余参数的敏感性由强到弱依次为孔隙率(n)、饱和含水率(θs)、导热系数(λ)、残余含水率(θr)和土体密度(ρ),极差值分别为0.046 5,0.029 3,0.026 6,0.014 3和0.011 3,相对于渗透率和土体比热容,这5个参数对于温度场计算结果的影响较小。【结论】在对土石坝温度场进行校正时,应将模型中的渗透率和土体比热容作为重点参数。
关键词:  土石坝  热-流耦合模型  温度场  正交试验法  敏感性分析
DOI:
分类号:
基金项目:国家自然科学基金项目(51679194)
Sensitivity analysis of thermal-hydro coupling model parameters in earth rock dam based on orthogonal test method
ZHANG Wenbing,REN Jie,YANG Jie,et al
Abstract:
【Objective】The sensitivity of thermal-hydro coupling model parameters was studied to reduce the workload of parameter correction during operation,which would provide basis for parameter selection of thermal-hydro coupling model.【Method】Based on the dam thermal-hydro coupling model,the sensitivity of dam thermal-hydro coupling model parameters for the earth rock dam of a reservoir was analyzed using average temperature of dam body and foundation indexes.【Result】The permeability and specific heat capacity of soil were sensitive to temperature field of the earth-rock dam,with the range values of 0.124 5 and 0.086 2,respectively.The sensitivity of other parameters was in the decreasing order of porosity (n),saturated water content (θs),thermal conductivity (λ),residual water content (θr) and soil density (ρ) with range values of 0.046 5,0.029 3,0.026 6,0.014 3 and 0.011 3,respectively.Compared to permeability and soil specific heat capacity,these five parameters had little effect on calculation of temperature field.【Conclusion】In the correction of temperature field of earth rock dam,permeability and specific heat capacity of soil should be used as key parameters.
Key words:  earth rock dam  thermal-hydro coupling  temperature field  orthogonal test method  sensitivity analysis