论文成果
Linear elastic and plastic-damage analyses of a concrete cut-off wall constructed in deep overburden
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- 论文类型:期刊论文
- 发表时间:2015-09-01
- 发表刊物:COMPUTERS AND GEOTECHNICS
- 收录刊物:SCIE、EI、Scopus
- 文献类型:J
- 卷号:69
- 期号:69
- 页面范围:462-473
- ISSN号:0266-352X
- 关键字:Asphalt concrete core dam; Deep overburden; Concrete cut-off wall;
Plastic-damage model; Damage degree
- 摘要:Asphalt concrete core dams (ACCDs) are becoming more widely used worldwide. ACCDs with concrete cut-off walls (for controlling foundation seepage) have been constructed in deep overburden. It is important to assess dam safety by analysing the stress and deformation behaviour of the concrete cut-off wall. In this study, a 3D finite element (FE) procedure was developed to simulate the dam construction and water impounding processes of an ACCD. Rockfill/gravel materials were described using a DuncanChang model, and the interface between the concrete cut-off wall and the foundation gravel was modelled using interfacial elements that follow a tangential hyperbolic stress-strain model. The linear elastic and plastic-damage models were employed to model the concrete cut-off wall. The stress-deformation behaviour and the damage distribution of the concrete cut-off wall were numerically simulated and analysed. The results indicate that the plastic-damage model was more reliable than the elastic model in describing the mechanical behaviour of the concrete cut-off wall. The plastic-damage model can be used to evaluate the safety of concrete cut-off walls constructed in deep overburden. (C) 2015 Elsevier Ltd. All rights reserved.