摘要
白垩是一种典型的多孔岩石,三轴试验研究成果表明白垩具有2种塑性力学机理:塑性压缩(孔隙坍塌)和剪切破坏。孔隙度对白垩的塑性力学特征有重要影响,在描述白垩塑性行为的本构方程中,特别是描述塑性压缩(孔隙坍塌)的塑性力学机理,需要考虑孔隙的影响。基于对白垩力学机理的认识,建立了基于Gurson屈服准则的本构关系用来描述白垩的塑性压缩(孔隙坍塌)机理的本构模型,模拟结果与试验成果相一致。
Chalk is a typical material with high porosity. The experimental results suggest that the chalk behavior can be modeled in terms of elastoplastic model with two plastic deformation mechanisms： plastic compaction （pore collapse） and plastic shearing. Porosity plays an important role in the chalk plastic behavior. In other words, the effect of porosity needs to be taken into account in the modelling of chalk plastic behavior, especially in the modelling of chalk plastic compaction. Based on the concept, a new constitutive model, which is based on the Gurson criterion, is proposed for the description of plastic compaction behaviors in porous chalks. In general, the model predictions are in satisfactory agreement with the experimental results.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第17期3154-3158,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展规划(973)项目(2002CB412707)
