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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

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.