基于正交试验土石坝热-流耦合模型参数的敏感性分析
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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。
【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 5and 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 3and 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 ofsoil should be used as key parameters.
【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 5and 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 3and 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 ofsoil should be used as key parameters.
引文
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[18]张彬,李卫明,封帆,等.基于COMSOL的地下水封油库围岩流固耦合特征模拟研究[J].工程地质学报,2012,20(5):789-795.Zhang B,Li W M,Feng F,et al.Numerical simulation for fluid-solid coupling characteristics surrounding rock of underground water-sealed oil storage based on COMSOL[J].Journal of Engineering Geology,2012,20(5):789-795.
[19]孟亚运,李同春,姚纬明,等.堆石料流变参数对面板堆石坝变形敏感性分析研究[J].中国农村水利水电,2014(8):154-157.Meng Y Y,Li T C,Yao W M,et al.Sensitivity analysis of rockfill rheological model parameters to deformation of concrete faced rockfill dams[J].China Rural Water and Hydropower,2014(8):154-157.
[2]吴志伟,宋汉周.基于流-热耦合模型的土石坝渗流热监测研究[J].岩土力学,2015,36(2):584-590.Wu Z W,Song H Z.Numerical simulation of embankment dam seepage monitoring with temperature based on thermal-hydro coupling model[J].Rock and Soil Mechanics,2015,36(2):584-590.
[3]严文群,段祥宝,周志维.渗流场对温度场的影响机理初探[J].水动力学研究与进展,2013,28(1):35-40.Yan W Q,Duan X B,Zhou Z W.Study on mechanism about influence of seepage field on temperature field[J].Chinese Journal of Hydrodynamics,2013,28(1):35-40.
[4]段珣.基于温度示踪法的堤坝渗漏探测研究[J].科学技术与工程,2014,14(9):140-143.Duan X.Study on detection dam leakage with temperature tracer method[J].Science Technology and Engineering,2014,14(9):140-143.
[5]周志维.土石坝饱和非饱和渗流场与温度场耦合模型[D].江苏扬州:扬州大学,2013.Zhou Z W.Couple modeling of seepage field and temperature field for earth dam[D].Yangzhou,Jiangsu:Yangzhou University,2013.
[6]谷艳昌,王士军,庞琼,等.土石坝温度场反馈渗流场可行性研究[J].岩土工程学报,2014,36(9):1721-1726.Gu Y C,Wang S J,Pang Q,et al.Feasibility of temperature field feeding back seepage field for earth dams[J].Chinese Journal of Geotechnical Engineering,2014,36(9):1721-1726.
[7]吴志伟,宋汉周.基于Lu模型的浅部地温场与渗流场耦合研究[J].水利学报,2014,46(3):326-333.Wu Z W,Song H Z.Study on shallow geothermal field and seepage field coupling based on Lu model[J].Journal of Hydraulic Engineering,2014,46(3):326-333.
[8]倪恒,刘佑荣,龙治国.正交设计在滑坡敏感性分析中的应用[J].岩石力学与工程学报,2002(7):989-992.Ni H,Liu Y R,Long Z G.Applications of orthogonal design to sensitivity analysis of landslide[J].Chinese Journal of Rock Mechanics and Engineering,2002(7):989-992.
[9]朱志广,魏见海,姜容.正交试验设计在边坡敏感性分析中的应用[J].西部交通科技,2014(5):24-26.Zhu Z G,Wei J H,Jiang R.Application of orthogonal experimental design in sensitivity analysis of slope[J].Western China Communications Science and Technolog,2014(5):24-26.
[10]王瑞骏,李阳,丁占峰.堆石料流变模型参数敏感性分析的正交试验法[J].水利学报,2016,47(2):245-252.Wang R J,Li Y,Ding Z F.The sensitivity analysis of sevenparameter rockfill rheological model based on the orthogonal test method[J].Journal of Hydraulic Engineering,2016,47(2):245-252.
[11]李炎隆,李守义,丁占峰,等.基于正交试验法的邓肯-张E-B模型参数敏感性分析研究[J].水利学报,2013,44(7):873-879.Li Y L,Li S Y,Ding Z F,et al.The sensitivity analysis of Duncan-Chang E-B model parameters based on the orthogonal test method[J].Journal of Hydraulic Engineering,2013,44(7):873-879.
[12]吴梦喜.饱和-非饱和土中渗流Richards方程有限元算法[J].水利学报,2009,40(10):1274-1279.Wu M X.Finite-element algorithm for Richards’equation for saturated-unsaturated seepage flow[J].Journal of Hydraulic Engineering,2009,40(10):1274-1279.
[13] Van Genuchten M T.A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J].Soil Science Society of America Journal,1980,44:892-898.
[14] Shao M A,Robert H.Integral method for estimating soil hydraulic properties[J].Soil Science Society of American Journal,1998,62:585-592.
[15] Young M H,Karagunduz A,Simunek J,et al.A modified upward infiltration method for characterizing soil hydraulic properties[J].Soil Science Society of American Journal,2002,66:57-64.
[16] Healy R W,Ronan A D.Documentation of computer program VS2DH for simulation of energy transport in variably saturated porous media[R].Denver:US Geological Survey Information Center,1996.
[17] Lu S,Ren T,Gong Y S.An improved model for predicting soil thermal conductivity from water content at room temperature[J].Soil Science Society of America Journal,2006,71(1):8-14.
[18]张彬,李卫明,封帆,等.基于COMSOL的地下水封油库围岩流固耦合特征模拟研究[J].工程地质学报,2012,20(5):789-795.Zhang B,Li W M,Feng F,et al.Numerical simulation for fluid-solid coupling characteristics surrounding rock of underground water-sealed oil storage based on COMSOL[J].Journal of Engineering Geology,2012,20(5):789-795.
[19]孟亚运,李同春,姚纬明,等.堆石料流变参数对面板堆石坝变形敏感性分析研究[J].中国农村水利水电,2014(8):154-157.Meng Y Y,Li T C,Yao W M,et al.Sensitivity analysis of rockfill rheological model parameters to deformation of concrete faced rockfill dams[J].China Rural Water and Hydropower,2014(8):154-157.