高混凝土面板堆石坝面板浇筑时机的研究
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摘要
为了避免面板浇筑后堆石体的大量或不均匀变形,最新提出通过对堆石体填筑施工初期的监测资料进行整理和分析,对比邓肯模型、双屈服面弹塑性模型及清华非线性K-G模型在堆石坝应用的优缺点。结合施工初期的实测信息,确定在特定条件下最能反映堆石体真实情况的本构模型,利用BP神经网络结合遗传算法反演模型的最优参数,再正分析计算预测的堆石体施工期的沉降变形情况。将预测得到的沉降变形资料与堆石体填筑完成的实测沉降变形资料进行对比分析,以预测的堆石体沉降变形情况为参考数据,结合工程的实际要求,合理安排预留沉降期,进而确定合理的面板浇筑时机,避免堆石体较大的前期沉降变形对面板带来的不利影响,有效改善面板受力和变形情况。
In order to avoid large or non-uniform deformation of rockfill after face slab placement,it is proposed to analyze and sort out the early monitoring data of rockfill filling,and compare the advantages and disadvantages of Duncan model,two-yield surface elastic-plastic model and Tsinghua non-linear K-G model applied in rockfill dams.Based on the measured data at early construction,the constitutive model reflecting actual status of rockfill in specific conditions is determined.In combination with genetic algorithm,the BP neural network is used to back calculate the optimal parameters of the model,then analyze and calculate the predicted rockfill settlement and deformation during construction.By analysis and comparison of the predicted settlement and deformation with the measured settlement and deformation of the completed rockfill,and taking the predicted settlement and deformation of rockfill for reference,the settlement period is rationally prepared in advance and face slab placement time is reasonably determined so as to prevent negative influence of large rockfill settlement and deformation on the face slabs and improve the stress and deformation of face slabs.
In order to avoid large or non-uniform deformation of rockfill after face slab placement,it is proposed to analyze and sort out the early monitoring data of rockfill filling,and compare the advantages and disadvantages of Duncan model,two-yield surface elastic-plastic model and Tsinghua non-linear K-G model applied in rockfill dams.Based on the measured data at early construction,the constitutive model reflecting actual status of rockfill in specific conditions is determined.In combination with genetic algorithm,the BP neural network is used to back calculate the optimal parameters of the model,then analyze and calculate the predicted rockfill settlement and deformation during construction.By analysis and comparison of the predicted settlement and deformation with the measured settlement and deformation of the completed rockfill,and taking the predicted settlement and deformation of rockfill for reference,the settlement period is rationally prepared in advance and face slab placement time is reasonably determined so as to prevent negative influence of large rockfill settlement and deformation on the face slabs and improve the stress and deformation of face slabs.
引文
[1]梅锦煜.高混凝土面板堆石坝堆石体施工期变形研究[J].水利水电技术,2006,37(7):7-10.
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[4]蒋国澄.中国混凝土面板堆石坝十年回顾[C]//中国混凝土面板堆石坝十年学术研讨会论文集.北京,1995:1-10.
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[15]岑威钧.堆石料亚塑性本构模型及面板堆石坝数值分析[D].南京:河海大学水工结构工程,2005.
[16]岑威钧,王修信,Erich Bauer,朱岳明.堆石料的亚塑性本构建模及其应用研究[J].岩石力学与工程学报,2007,26(02):312-322.
[17]姜韶华.面板堆石坝非线性地震响应数值计算方法及三维效应分析[D].大连:大连理工大学岩土工程,2001.
[2]蔡金燕.水布垭混凝土面板堆石坝面板裂缝的成因与处理[J].湖北水力发电,2008,(02):32-34.
[3]刘光廷.高面板堆石坝面板应力规律分析及改善应力状态的对策[J].水利学报,2006,37(02):135-140.
[4]蒋国澄.中国混凝土面板堆石坝十年回顾[C]//中国混凝土面板堆石坝十年学术研讨会论文集.北京,1995:1-10.
[5]蒋国澄,赵增凯.中国的高混凝土面板堆石坝[C]//中国水利学会2001学术年会论文集,2001.
[6]徐泽平,邓刚.高面板堆石坝的技术进展及超高面板堆石坝关键技术问题探讨[J].水利学报,2008,39(10):1226-1234.
[7]冯业林.天生桥一级水电站混凝土面板堆石坝[M]//王柏乐.中国当代土石坝工程.北京:中国水利水电出版社,2004.
[8]蒋国澄.我国混凝土面板堆石坝的发展与经验[J].水力发电,1999,(10):45-48.
[9]夏富洲,混凝土面板堆石坝变形预测及反分析的神经网络方法[C]//武汉大学硕士生论文.武汉:2005.
[10]苏安安.水布垭面板堆石坝土体参数的位移反演分析[D].北京:清华大学水利水电工程系,2007.
[11]Duncan JM,CY Chang.Nonlinear analysis of stress and strain insoils[J].SMFD,1970.
[12]Duncan JM.etal.Strength,stress-strain and bulk modulus pa-rameters for finite element analysisof stresses and movements insoil masses[R].California:Berkerly,1980.
[13]Gao Lianshi.The nonlinear uncoupled K-G model for rockfillmaterial and its verification[C]//14Th Intrernational Conferenceon soil Mechanics and Foundational Engineering.Hamburg,1997.
[14]牟声远.高混凝土面板堆石坝安全性研究[D].西安:西北农林科技大学水工结构工程,2008.
[15]岑威钧.堆石料亚塑性本构模型及面板堆石坝数值分析[D].南京:河海大学水工结构工程,2005.
[16]岑威钧,王修信,Erich Bauer,朱岳明.堆石料的亚塑性本构建模及其应用研究[J].岩石力学与工程学报,2007,26(02):312-322.
[17]姜韶华.面板堆石坝非线性地震响应数值计算方法及三维效应分析[D].大连:大连理工大学岩土工程,2001.
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