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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2020, Vol. 54 Issue (7): 1390-1400    DOI: 10.3785/j.issn.1008-973X.2020.07.018
    
Elasto-plastic dynamic response analysis and seismic fragility research of high core earth-rockfill dam
Cong-cong JIN1,2(),Shi-chun CHI1,2,*()
1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
2. School of Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China
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Abstract  

The dynamic analysis of Nuozhadu high core earth-rockfill dam was conducted by adopting the improved PZC elastic-plastic model and the dynamic consolidation finite element program SWANDYNE II. The permanent deformation of the dam was obtained, and the calculation basis for seismic fragility analysis was provided. The crest relative seismic settlement rate was selected as the fragility performance parameter. The 60 well-matched ground motion records were picked from PEER according to the statistical earthquake situation in the main potential seismic source area of Nuozhadu high core earth-rockfill dam. The grade of performance level of the high core earth-rockfill dam was proposed combined with the performance of the dam anti-seismic level and the earthquake damage grade of core earth-rockfill dams. The seismic fragility analysis approach for the high earth-rockfill dam based on ANN-MSA was provided by introducing the artificial neural network method and combined with multi-strip method. The SWANDYNE II program was used to analyze the seismic ground motion by processing the selected seismic records. The relative seismic subsidence rates of the different PGAs can be obtained, which were used as training samples and test samples. RBFNN was utilized to train the training samples. The model through training and testing can well predict the relative seismic settlement rate. The seismic fragility of Nuozhadu high core earth-rockfill dam was analyzed combined with the prediction results of ANN and MSA method, and the three-dimensional seismic fragility surface of the dam was obtained.

Key words： modified PZC elasto-plastic model      SWANDYNE II program      ANN method      MSA approach     
Received: 23 December 2019      Published: 05 July 2020
CLC:  TV 641  
Corresponding Authors: Shi-chun CHI     E-mail: jincong3623@mail.dlut.edu.cn;schchi@dlut.edu.cn
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Cite this article:

Cong-cong JIN,Shi-chun CHI. Elasto-plastic dynamic response analysis and seismic fragility research of high core earth-rockfill dam. Journal of ZheJiang University (Engineering Science), 2020, 54(7): 1390-1400.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2020.07.018     OR     http://www.zjujournals.com/eng/Y2020/V54/I7/1390


高心墙堆石坝弹塑性动力反应分析及地震易损性研究

采用改进PZC弹塑性模型和动力固结有限元程序SWANDYNE II，对糯扎渡高土石坝进行动力分析，直接得到大坝永久变形，为地震易损性研究提供计算基础. 采用坝顶相对震陷率作为易损性性能参数，根据糯扎渡高土石坝所在区域的主要潜在震源区内统计地震情况，从PEER中选取60条吻合较好的地震动记录. 基于性能的大坝抗震设防水准 和土石坝震害等级，提出适合高土石坝的性能水平划分. 引入人工神经网络方法，结合多条带分法，提出基于ANN-MSA的高土石坝地震易损性分析方法. 该方法通过对选取的地震动记录调幅处理，利用SWANDYNE II程序对地震动进行分析，得到不同PGA的坝顶相对震陷率，作为训练样本和检验样本. 采用RBFNN对训练样本进行训练，利用训练和检验后的模型预测坝顶相对震陷率. 结合ANN预测结果和MSA方法，对糯扎渡高土石坝进行地震易损性分析，计算出该大坝的三维地震易损性曲面.


关键词： 改进PZC弹塑性模型,  SWANDYNE II程序,  ANN方法,  MSA方法 
Fig.1 Dam finite element model
筑坝料 Ko Go Mg Mf αg αf H0 β0 β1 γ' γden Hu0 γu
堆石料Ⅰ 930 810 1.61 1.24 0.45 0.45 800 3.1 0.10 40 130 1400 6.5
堆石料Ⅱ 1050 960 1.55 1.17 0.45 0.45 1000 3.3 0.15 40 130 1400 7.5
心墙料 240 190 1.05 0.79 0.45 0.45 1400 3.2 0.13 16 80 900 4.3
Tab.1 Parameters of improved PZC model
Fig.2 Comparison of static test results and improved PZC model calculation results of gravel
Fig.3 Comparison of dynamic test results and improved PZC model calculation results of gravel clay
Fig.4 Contour lines of major and minor principal stresses
P100 Amax/(cm·s-2) T1/ s T2/ s βmax γ
2% 385 0.12 0.7 2.6 1
Tab.2 Peak ground acceleration and parameters
Fig.5 Time-history of input motion
Fig.6 Contour lines of permanent displacements
Fig.7 Deformation of dam outline after earthquake
震级分档 地震数量
5≤M<6 61
6≤M<7 22
7≤M<8 6
Tab.3 Statistical table of historical destructive earthquakes
Fig.8 Distribution of potential hypocentral regions
名称 震级上限 震源编号
普洱-思茅 7.0 4
临沧东 6.5 6
莲花塘 6.5 7
耿马-澜沧 8.0 10
勐海 7.5 11
勐海西南 7.5 12
Tab.4 General potential hypocentral region
Fig.9 Distribution of potential hypocentral regions
Fig.10 Acceleration spectrum curves of 60 earthquakes
震害等级 震害状态
Ⅰ 级 宏观上无震害
Ⅱ 级 有宽度小于5 mm纵向裂缝，宏观上无沉降，需要作简单的处理
Ⅲ 级 有多条宽度大于5 mm纵向裂缝，宏观上可以看出沉降，有横向裂缝，需要进行整修和加固
Ⅳ 级 坝体产生滑裂，坝坡局部隆起、凹陷或滑坡，需要进行大修和加固
Ⅴ 级 坝坡大面积滑坡，坝基失稳，坝体陷落，设置垮坝，需要重修
Tab.5 Earth rockfill dam earthquake damage criteria
Fig.11 Relationship between peak ground acceleration and relative seismic settlement rate
性能水平 性能描述 δ
PL 1 轻微破坏 坝顶震陷量不超过50 cm (0.5/H)×100%
PL 2 中等破坏 50年超越概率10%作用下坝顶相对震陷率 1.8 ${a_{\max }}$
PL 3 较重破坏 100年超越概率2%作用下坝顶相对震陷率 1.8 ${a_{\max }}$
PL 4 严重破坏 100年超越概率2%作用下坝顶相对震陷率加1 m安全超高 1.8 ${a_{\max }}$+(1.0/H)×100%
Tab.6 Grade of performance level of high earth rockfill dam
Fig.12 Loma Prieta earthquake wave
Fig.13 Contour lines of permanent displacements
训练样本 检验样本
编号 PGA/g δf/% δR/% E/% 编号 PGA/g δf/% δR/% E/%
1 0.02 0.0129 0.0125 ?3.10 31 0.04 0.0321 0.0323 0.65
2 0.06 0.0461 0.0454 ?1.65 32 0.08 0.0793 0.0802 1.13
3 0.10 0.1128 0.1159 2.78 33 0.14 0.1681 0.1669 ?0.70
4 0.12 0.1466 0.1512 3.16 34 0.18 0.2350 0.2320 ?1.29
5 0.16 0.2154 0.2221 3.15 35 0.24 0.3358 0.3382 0.71
6 0.20 0.2906 0.2937 1.07 36 0.28 0.4142 0.4138 ?0.08
7 0.22 0.3216 0.3298 2.54 37 0.34 0.5465 0.5337 ?2.34
8 0.26 0.3946 0.4027 2.04 38 0.38 0.6256 0.6174 ?1.30
9 0.30 0.4779 0.4767 ?0.24 39 0.44 0.7484 0.7481 ?0.04
10 0.32 0.5078 0.5144 1.30 40 0.48 0.8334 0.8385 0.61
11 0.36 0.5857 0.5907 0.85 41 0.54 0.9656 0.9784 1.32
12 0.40 0.6998 0.6689 0.44 42 0.58 1.0757 1.0743 ?0.13
… … … … … … … …
29 0.96 2.0869 2.0886 0.08 49 0.94 2.0247 2.0223 ?0.11
30 1.00 2.2146 2.2230 0.38 50 0.98 2.1503 2.1358 ?0.67
Tab.7 RBFNN train result of relative settlement rate
Fig.14 Earthquake fragility surface
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