强震作用下面板堆石坝跨尺度面板开裂演化分析

孔宪京; 屈永倩; 邹德高; 陈楷; 刘京茂

doi:10.11779/CJGE202006001

强震作用下面板堆石坝跨尺度面板开裂演化分析 English Version

孔宪京^{1, 2,},
屈永倩^{1, 2, ,},
邹德高^{1, 2},
陈楷^{1, 2},
刘京茂^{1, 2}

1.
大连理工大学海岸与近海工程国家重点实验室,辽宁　大连　116024
2.
大连理工大学水利工程学院,辽宁　大连　116024

基金项目:

国家自然科学基金项目 U1965206

国家自然科学基金项目 51779034

中央高校基本科研业务费资助项目 DUT19ZD216

华能集团科技项目 HNKJ18-H25

详细信息

作者简介:
孔宪京(1952—),男,博士,教授,主要从事高土石坝抗震和岩土地震工程方面的研究。E-mail: kongxj@dlut.edu.cn

通讯作者:
屈永倩, E-mail: quyongqian@mail.dlut.edu.cn

中图分类号: TV64
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出版历程
- 收稿日期: 2019-09-18
- 网络出版日期: 2022-12-07
- 刊出日期: 2020-05-31

Cross-scale crack evolution analysis for face slab in concrete faced rockfill dams under strong earthquake

KONG Xian-jing^{1, 2,},
QU Yong-qian^{1, 2, ,},
ZOU De-gao^{1, 2},
CHEN Kai^{1, 2},
LIU Jing-mao^{1, 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

摘要

摘要: 准确定位面板薄弱区域、定量评价面板破坏程度对面板坝抗震安全评价至关重要。联合非完全点对点界面和四分树网格生成技术,实现了面板坝面板与垫层接触作用的两级跨尺度精细化建模；引入混凝土黏聚力模型并联合筑坝材料广义塑性模型、状态相关的弹塑性接触面模型考虑材料强非线性和破坏过程,建立了强震作用下面板动力弹塑性跨尺度开裂演化分析方法,并研发了显式地震波动分析框架下的SBFEM-FEM耦合计算软件。以200 m级面板坝为例进行了面板动力破坏数值分析,并分别考虑了面板配筋率、竖向地震和坝前水深的影响。结果表明：十分直观地再现面板坝防渗面板的动力开裂演化过程,有助于定位面板局部薄弱区域、定量评价面板破坏程度以及评估抗震措施加固效果,为混凝土面板抗震优化设计和极限抗震能力评估提供技术支持。可拓展用于其它混凝土防渗结构破坏计算,且可容易地扩展至三维分析应用。
- 强震作用 /
- 面板堆石坝 /
- 开裂演化 /
- 黏聚力模型 /
- 弹塑性分析 /
- 跨尺度
Abstract: It is crucially important for seismic safety evaluation of high concrete faced rockfill dams (CFRDs) to accurately locate the weak area of the panel and to quantitatively assess the damage of the face slab. In this study, the cross-scale model for CFRD is established using the interface element with asymmetric nodes and Quadtree for refined simulation of slab and cushion interaction. The cohesive zone model for concrete, the generalized plastic model for rockfill and the state-dependent elasto-plastic interface model are combined and used to describe the strong nonlinearity and failure process. On the above basis, the cross-scale crack evolution analysis method under strong earthquake is established and the coupled SBFEM-FEM analysis software is developed in the explicit earthquake wave motion input method frame. The dynamic failure analyses of slabs are performed for a 200-m-high CFRD considering the reinforcement ratio, vertical earthquake and water level of reservoir. The results indicate that the developed method can visually represent the seismic cracking evolution, conveniently locate weak areas of face slab, quantitatively determine the damage severity, and evaluate the aseismic measures. The research results may provide an effective method for the aseismic design and assessment of ultimate aseismic capacity of concrete slab. The proposed method can be extended to the failure analyses of other concrete structures and three-dimensional investigation and application easily.
- strong earthquake /
- CFRD /
- cracking evolution /
- cohesive zone model /
- elasto-plastic analysis /
- cross-scale

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图 1 黏聚力模型和界面单元

Figure 1. Cohesive zone model and interface elements

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图 2 牵引力和位移关系

Figure 2. Relationship between traction and displacement

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图 3 混凝土梁几何模型

Figure 3. Geometry of concrete beams

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图 4 测得的冲击荷载时间曲线

Figure 4. Time histories of measured loads

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图 5 加载点的荷载位移曲线

Figure 5. Relationship between load and displacement at loading point

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图 6 裂纹尖端扩展

Figure 6. Time histories of crack extension

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图 7 测点应变时程

Figure 7. Time histories of strain at observing points

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图 8 面板堆石坝跨尺度分析模型

Figure 8. Cross-scale model for CFRDs

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图 9 地震动加速度时程

Figure 9. Acceleration histories of input ground motion

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图 10 地震过程中裂缝位置和最大宽度

Figure 10. Location and maximum width of crack during earthquake

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图 11 面板迎水面开裂单元的裂缝宽度、刚度退化因子、混凝土顺坡向应力和钢筋应力时程

Figure 11. Time histories of axial stress of steel, concrete stress along slope, degeneration factor, and crack width of at upstream side during earthquake

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图 12 面板震后残余裂缝

Figure 12. Residual crack after earthquake

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图 13 面板顺坡向静动叠加应力

Figure 13. Stresses along slope of face slab at certain time

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图 14 考虑竖向地震后,面板的开裂位置,损伤时刻和最大裂缝宽度

Figure 14. Crack location, initial cracking moment and maximum crack width of concrete face slab considering vertical earthquake

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图 15 考虑竖向地震后,面板残余裂缝分布

Figure 15. Distribution of residual crack considering vertical earthquake

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图 16 坝体震后变形轮廓（放大50倍）

Figure 16. Residual deformations of dam (magnified 50 times)

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表 1 面板和基岩线弹性模型参数

Table 1 Parameters of slab and bedrock

名称 E/GPa ρ/(kg·m^-3) $ν$ $ν$

面板 31 2500 0.17
基岩 10 2400 0.25

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表 2 配筋率对面板动力开裂的影响

Table 2 Influences of reinforcement ratio on crack width

配筋率/% 地震中最大裂缝宽度/mm 震后残余裂缝宽度/mm

0.3 15.0 1.7
0.6 11.3 1.4
0.9 0.1 0.0

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表 3 坝前水深对面板动力开裂的影响

Table 3 Influences of water level on crack width

坝前水深/m 地震中最大裂缝宽度/mm 震后残余裂缝宽度/mm

190 20.0 1.2
170 0.1 0.0
140 0.0 0.0

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名称	E/GPa	ρ/(kg·m^-3)	$ν$ $ν$
面板	31	2500	0.17
基岩	10	2400	0.25

配筋率/%	地震中最大裂缝宽度/mm	震后残余裂缝宽度/mm
0.3	15.0	1.7
0.6	11.3	1.4
0.9	0.1	0.0

坝前水深/m	地震中最大裂缝宽度/mm	震后残余裂缝宽度/mm
190	20.0	1.2
170	0.1	0.0
140	0.0	0.0

强震作用下面板堆石坝跨尺度面板开裂演化分析 English Version

作者简介: 孔宪京(1952—),男,博士,教授,主要从事高土石坝抗震和岩土地震工程方面的研究。E-mail: kongxj@dlut.edu.cn

通讯作者: 屈永倩, E-mail: quyongqian@mail.dlut.edu.cn

计量

出版历程

Cross-scale crack evolution analysis for face slab in concrete faced rockfill dams under strong earthquake

期刊类型引用(4)

其他类型引用(5)

计量

出版历程

目录

作者简介:
孔宪京(1952—),男,博士,教授,主要从事高土石坝抗震和岩土地震工程方面的研究。E-mail: kongxj@dlut.edu.cn

通讯作者:
屈永倩, E-mail: quyongqian@mail.dlut.edu.cn