淤积泥砂对垂直地运动作用时刚性坝面动压力的影响研究
|
摘要
作者应用时域显式有限元模型分析了可压缩库水条件下淤积泥砂对垂直地运动作用时刚性坝面上动压力的影响。文中首先通过与解析解的比较,验证了计算模式的正确性。随后的分析中研究了作为液固两相介质处理的淤砂层的饱和度、厚度、渗透系数和孔隙率对坝面动压力的影响,以及作为液固两相介质、单相固体、单相重流体介质处理的淤砂层模型间的计算结果差异。计算结果表明:饱和淤砂层使得库水自振频率增加,而非饱和淤砂层使得库水自振频率明显减小。
The effects of sediment on the hydrodynamic pressures acting on rigid dams during vertical ground motion were studied By use of an explicit finite element scheme in this paper. and the model was also verified by comparing the results with the analytical solutions. Sediment was modeled as porous medium in the model and the effects of its saturation, thickness, permeability and porosity on dynamic pressures octing on rigid dam faces were analyzed. Finally, sedment was modeled as unitary solid and unitary fluid, respectively, and the results were compared with those obtained by modeling sediment as porous medium. The investigation shows that the fully saturated sediment would increase the natural frequencies of the reservoir water and the partially saturated sediment would decrease the natural frequencies significantly.
The effects of sediment on the hydrodynamic pressures acting on rigid dams during vertical ground motion were studied By use of an explicit finite element scheme in this paper. and the model was also verified by comparing the results with the analytical solutions. Sediment was modeled as porous medium in the model and the effects of its saturation, thickness, permeability and porosity on dynamic pressures octing on rigid dam faces were analyzed. Finally, sedment was modeled as unitary solid and unitary fluid, respectively, and the results were compared with those obtained by modeling sediment as porous medium. The investigation shows that the fully saturated sediment would increase the natural frequencies of the reservoir water and the partially saturated sediment would decrease the natural frequencies significantly.
引文
[1] WestergaardHM.Waterpressuresondamsduringearthquakes[J].TransactionsofASCE,1933,98:418-433.
[2] 杜修力,王进廷.动水压力及其对坝体地震反应影响的研究进展[J].水利学报,2001,(7):13-21.
[3] FenvesG,ChopraAK.Effectsofreservoirbottomabsorptionanddam water foundationrockinteractiononfrequencyresponsefunctionsforconcretegravitydams[J].EarthquakeEngineeringandStructuralDynamics,1985,13(1):13-31.
[4] MedinaF,DominguezJ,TassoulasJL.Responseofdamstoearthquakeinculdingeffectsofsediment[J].JournalofStructuralEngineering,ASCE,1990,116(1):3108-3121.
[5] 傅作新,陆瑞明.水库的库底条件和挡水结构的动水压力[J].水利学报,1987,(5):28-34.
[6] ChengAHD.Effectsofsedimentonearthquake inducedreservoirhydrodynamicresponse[J].JournalofEngineeringMechanics,ASCE,1986,112(7):654-663.
[7] BougachaS,TassoulasJL.SeismicresponseofgravitydamsⅠ:Modelingofsediments[J].JournalofEngineeringMechanics,ASCE,1991,117(8):1826-1837.
[8] BougachaS,TassoulasJL.SeismicresponseofgravitydamsⅡ:Effectsofsediments[J].JournalofEngineeringMechanics,ASCE,1991,117(8):1839-1950.
[9] ChenBF,HungTK.Hydrodynamicpressureofwaterandsedimentonrigiddam[J].JournalofEngineeringMechanics,ASCE,1993,119(7):1411-1433.
[10] DominguezJ,GallegoR,JaponBR.Effectsofporoussedimentsonseismicresponseofconcretegravitydams[J].JournalofEngineeringMechanics,ASCE,1997,123(4):302-311.
[11] DuXiuli,WangJinting,HungTinkan.EffectsofSedimentontheDynamicPressureofWaterandSedimentondams[J].ChineseScienceBulletin,2001,46(7):521-524.
[12] 杜修力,王进廷.阻尼弹性结构动力计算的显式差分法[J].工程力学,2000,17(5):37-43.
[13] 王进廷,杜修力,赵成刚.液固两相饱和介质波动分析的一种显式有限元法[J].岩石力学与工程学报,2002,21(8):1199-1204.
[14] 王进廷,杜修力,赵成刚.分层分介质中波动传播分析的显式有限元法[J].岩石力学与工程学报,2003,22(1).
[15] 王进廷.高混凝土坝-可压缩库水-淤砂-地基系统地震反应分析研究[D].北京:中国水利水电科学研究院,2001.
[16] 李小军.非线性场地地震反应分析方法的研究[D].哈尔滨:国家地震局工程力学研究所,1993.
[17] 王维佳.粘性可压缩流体中的波[J].地球物理学报,1984,27(1):84-93.
[18] BiotMA.Theoryofpropagationofelasticwavesinafluid saturatedporoussolid[J].JournaloftheAcousticalSocietyofAmerica,1965,28,168-191.
[19] BiotMA,WillisDG.Theelasticcoefficientsofthetheoryofconsolidation[J].JournalofAppliedMechanics,1957,24:594-601.
[2] 杜修力,王进廷.动水压力及其对坝体地震反应影响的研究进展[J].水利学报,2001,(7):13-21.
[3] FenvesG,ChopraAK.Effectsofreservoirbottomabsorptionanddam water foundationrockinteractiononfrequencyresponsefunctionsforconcretegravitydams[J].EarthquakeEngineeringandStructuralDynamics,1985,13(1):13-31.
[4] MedinaF,DominguezJ,TassoulasJL.Responseofdamstoearthquakeinculdingeffectsofsediment[J].JournalofStructuralEngineering,ASCE,1990,116(1):3108-3121.
[5] 傅作新,陆瑞明.水库的库底条件和挡水结构的动水压力[J].水利学报,1987,(5):28-34.
[6] ChengAHD.Effectsofsedimentonearthquake inducedreservoirhydrodynamicresponse[J].JournalofEngineeringMechanics,ASCE,1986,112(7):654-663.
[7] BougachaS,TassoulasJL.SeismicresponseofgravitydamsⅠ:Modelingofsediments[J].JournalofEngineeringMechanics,ASCE,1991,117(8):1826-1837.
[8] BougachaS,TassoulasJL.SeismicresponseofgravitydamsⅡ:Effectsofsediments[J].JournalofEngineeringMechanics,ASCE,1991,117(8):1839-1950.
[9] ChenBF,HungTK.Hydrodynamicpressureofwaterandsedimentonrigiddam[J].JournalofEngineeringMechanics,ASCE,1993,119(7):1411-1433.
[10] DominguezJ,GallegoR,JaponBR.Effectsofporoussedimentsonseismicresponseofconcretegravitydams[J].JournalofEngineeringMechanics,ASCE,1997,123(4):302-311.
[11] DuXiuli,WangJinting,HungTinkan.EffectsofSedimentontheDynamicPressureofWaterandSedimentondams[J].ChineseScienceBulletin,2001,46(7):521-524.
[12] 杜修力,王进廷.阻尼弹性结构动力计算的显式差分法[J].工程力学,2000,17(5):37-43.
[13] 王进廷,杜修力,赵成刚.液固两相饱和介质波动分析的一种显式有限元法[J].岩石力学与工程学报,2002,21(8):1199-1204.
[14] 王进廷,杜修力,赵成刚.分层分介质中波动传播分析的显式有限元法[J].岩石力学与工程学报,2003,22(1).
[15] 王进廷.高混凝土坝-可压缩库水-淤砂-地基系统地震反应分析研究[D].北京:中国水利水电科学研究院,2001.
[16] 李小军.非线性场地地震反应分析方法的研究[D].哈尔滨:国家地震局工程力学研究所,1993.
[17] 王维佳.粘性可压缩流体中的波[J].地球物理学报,1984,27(1):84-93.
[18] BiotMA.Theoryofpropagationofelasticwavesinafluid saturatedporoussolid[J].JournaloftheAcousticalSocietyofAmerica,1965,28,168-191.
[19] BiotMA,WillisDG.Theelasticcoefficientsofthetheoryofconsolidation[J].JournalofAppliedMechanics,1957,24:594-601.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心