数字化施工下高心墙堆石坝结构性态精细数值模拟研究
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摘要
为考虑实际施工质量对堆石坝结构性态的影响,提出了数字化施工下高心墙堆石坝结构性态精细数值模拟分析方法。首先,基于数字化施工技术估计得到了大坝任意位置处的坝料压实质量。其次,通过室内试验,建立了坝料压实质量与力学模型参数的回归关系模型,从而实现大坝任意位置处模型参数的空间估计。在此基础上,通过程序开发,实现了任意单元计算模型参数的精细赋值。最后,采用精细有限元模型实现了高心墙堆石坝应力变形的数值模拟,并采用精细扩展有限元模型实现了心墙蓄水期可能水力劈裂的预测模拟。计算结果显示该方法可以更好地反映大坝施工过程的变形情况,提高了计算的准确性。该方法充分考虑了大坝实际施工质量下坝料力学参数在空间上的差异性,克服了传统方法采用同分区相同坝料力学参数而导致的计算精度不足的弊端。
In order to consider the impact of actual construction quality on the structural behaviors for high core wall rockfill dams, a refined numerical simulation method for analyzing the structural behaviors of rockfill dams based on construction digitization is proposed. Firstly, the construction quality at any location of the dam is estimated by utilizing the construction digitization technologies. Secondly, the regression models between dam compaction quality and the model parameters are established using the samples of laboratory tests. Then the spatial estimation of model parameters at any dam location is achieved. On this basis, these parameters of each element are assigned by program development. Finally, the refined finite element simulation is proposed for analyzing the stress and deformation of high core wall rockfill dams. And the refined extended-finite-element simulation is presented for predicting the potential hydraulic fractures of high core wall. The calculated results show that the proposed method represents the structural behaviors more objectively and accurately, and it fully considers the spatial differences in mechanical model parameters resulting from the spatial difference in actual construction quality, thus representing an improvement in accuracy from the conventional methods which typically assign the same parameter values to the elements of the same dam zone.
In order to consider the impact of actual construction quality on the structural behaviors for high core wall rockfill dams, a refined numerical simulation method for analyzing the structural behaviors of rockfill dams based on construction digitization is proposed. Firstly, the construction quality at any location of the dam is estimated by utilizing the construction digitization technologies. Secondly, the regression models between dam compaction quality and the model parameters are established using the samples of laboratory tests. Then the spatial estimation of model parameters at any dam location is achieved. On this basis, these parameters of each element are assigned by program development. Finally, the refined finite element simulation is proposed for analyzing the stress and deformation of high core wall rockfill dams. And the refined extended-finite-element simulation is presented for predicting the potential hydraulic fractures of high core wall. The calculated results show that the proposed method represents the structural behaviors more objectively and accurately, and it fully considers the spatial differences in mechanical model parameters resulting from the spatial difference in actual construction quality, thus representing an improvement in accuracy from the conventional methods which typically assign the same parameter values to the elements of the same dam zone.
引文
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[12]陈辉,刘东海,戚蓝.数字化施工下堆石坝模型参数空间估计及赋值[J].岩土工程学报,2018,40(2):278-286.(CHEN Hui,LIU Dong-hai,QI Lan.Spatial estimation and assignment of rockfill dam finite element model parameters under digitized construction[J].Chinese Journal of Geotechnical Engineering,2018,40(2):278-286.(in Chinese))
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[15]李宗利,王亚红,金学洋,等.恒定光滑裂缝宽度缝内水压发展过程试验与分析[J].水力发电学报,2011,30(3):169-174.(LI Zong-li,WANG Ya-hong,JIN Xue-yang,et al.Experiment and analysis of water pressure development inside smooth fracture with a constant opening[J].Journal of Hydroelectric Engineering,2011,30(3):169-174.(in Chinese))
[16]MELENK J M,BABU?KA I.The partition of unity finite element method:Basic theory and applications[J].Computer Methods in Applied Mechanics and Engineering,1996,139(1/2/3/4):289-314.
[17]CARPINTERI A,VALENTE S,FERRARA G,et al.Experimental and numerical fracture modelling of a gravity dam[M].New York:Marcel Dekker,1994.
[18]李全明.土石坝水力劈裂的物理机制及数值仿真[M].北京:气象出版社,2012.(LI Quan-ming.Physical mechanism and numerical simulation of hydraulic fracturing in core of earth-rockfill dam[M].Beijing:China Meteorological Press,2012.(in Chinese))
[2]殷宗泽.高土石坝的应力与变形[J].岩土工程学报,2009,31(1):1-14.(YIN Zong-ze.Stress and deformation of high earth and rock-fill dams[J].Chinese Journal of Geotechnical Engineering,2009,31(1):1-14.(in Chinese))
[3]SU H Z,HU J,WEN Z P.Structure analysis for concretefaced rockfill dams based on information entropy theory and finite element method[J].International Journal for Numerical and Analytical Methods in Geomechanics,2012,36(8):1041-1055.
[4]陈生水,阎志坤,傅中志,等.特高面板砂砾石坝结构安全性论证[J].岩土工程学报,2017,39(11):1949-1958.(CHEN Sheng-shui,YAN Zhi-kun,FU Zhong-zhi,et al.Evaluation of safety performance of extremely high slabfaced gravel dams[J].Chinese Journal of Geotechnical Engineering,2009,39(11):1949-1958.(in Chinese))
[5]李全明,张丙印,于玉贞,等.土石坝水力劈裂发生过程的有限元数值模拟[J].岩土工程学报,2007,29(2):212-217.(LI Quan-ming,ZHANG Bing-yin,YU Yu-zhen,et al.Numerical simulation of the process of hydraulic fracturing in earth and rockfill dams[J].Chinese Journal of Geotechnical Engineering,2007,29(2):212-217.(in Chinese))
[6]ZHONG D H,CUI B,LIU D H,et al.Theoretical research on construction quality real-time monitoring and system integration of core rockfill dam[J].Science in China Series E-Technological Science,2009,52(11):3406-3412.
[7]钟登华,刘东海,崔博.高心墙堆石坝碾压质量实时监控技术及应用[J].中国科学:技术科学,2011,41(8):1027-1034.(ZHONG Deng-hua,LIU Dong-hai,CUI Bo.Real-time compaction quality monitoring of high core rock-fill dam[J].Science China-Technological Sciences,2011,41(8):1027-1034.(in Chinese))
[8]马洪琪,钟登华,张宗亮,等.重大水利水电工程施工实时控制关键技术及其工程应用[J].中国工程科学,2011,13(12):20-27.(MA Hong-qi,ZHONG Deng-hua,ZHANGZong-liang,et al.Key technologies of real-time construction control for major hydraulic and hydroelectric projects[J].Engineering Sciences,2011,13(12):20-27.(in Chinese))
[9]LIU D H,CUI B,LIU Y G,et al.Automatic control and real-time monitoring system for earth-rock dam material truck watering[J].Automation in Construction,2013,30:70-80.
[10]LIU D H,SUN J,ZHONG D H.Compaction quality control of earth-rock dam construction using real-time field operation data[J].Journal of Construction Engineering and Management,ASCE,2012,138(9):1085-1094.
[11]LIU D H,LI Z L,LIAN Z H.Compaction quality assessment of earth-rock dam materials using roller-integrated compaction monitoring technology[J].Automation in Construction,2014,44(8):234-246.
[12]陈辉,刘东海,戚蓝.数字化施工下堆石坝模型参数空间估计及赋值[J].岩土工程学报,2018,40(2):278-286.(CHEN Hui,LIU Dong-hai,QI Lan.Spatial estimation and assignment of rockfill dam finite element model parameters under digitized construction[J].Chinese Journal of Geotechnical Engineering,2018,40(2):278-286.(in Chinese))
[13]DUNCAN J M,CHANG C Y.Nonlinear analysis of stress and strain in soils[J].Asce Soil Mechanics&Foundation Division Journal 1970,96(5):1629-1653.
[14]王俊杰.基于断裂力学的土石坝心墙水力劈裂研究[D].南京:河海大学,2005.(WANG Jun-jie.Investigation on ability of rock-fill dam core to resist hydraulic fracturing based on fracture mechanics[D].Nanjing:Hohai University,2005.(in Chinese))
[15]李宗利,王亚红,金学洋,等.恒定光滑裂缝宽度缝内水压发展过程试验与分析[J].水力发电学报,2011,30(3):169-174.(LI Zong-li,WANG Ya-hong,JIN Xue-yang,et al.Experiment and analysis of water pressure development inside smooth fracture with a constant opening[J].Journal of Hydroelectric Engineering,2011,30(3):169-174.(in Chinese))
[16]MELENK J M,BABU?KA I.The partition of unity finite element method:Basic theory and applications[J].Computer Methods in Applied Mechanics and Engineering,1996,139(1/2/3/4):289-314.
[17]CARPINTERI A,VALENTE S,FERRARA G,et al.Experimental and numerical fracture modelling of a gravity dam[M].New York:Marcel Dekker,1994.
[18]李全明.土石坝水力劈裂的物理机制及数值仿真[M].北京:气象出版社,2012.(LI Quan-ming.Physical mechanism and numerical simulation of hydraulic fracturing in core of earth-rockfill dam[M].Beijing:China Meteorological Press,2012.(in Chinese))