Constitutive model for monotonic and cyclic responses of loosely cemented sand formations

作     者：Mojtaba Rahimi Dave Chan Alireza Nouri 

作者机构：Department of Mechanical EngineeringAzad UniversityKhomeinishahr BranchIsfahanIran Department of Civil and Environmental EngineeringUniversity of AlbertaEdmontonT6G 2W2Canada China Three Gorges UniversityYichangChina 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2018年第10卷第4期

页      面：740-752页

核心收录：

学科分类：08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Funding for this project has been provided by BP Canada and the Nature Science and Engineering Research Council of Canada(NSERC) 

主　　题：Cyclic loading Monotonic loading Cemented sand Plasticity Constitutive model 

摘      要：This paper presents a model to simulate the monotonic and cyclic behaviours of weakly cemented *** elastoplastic constitutive model within the framework of bounding surface plasticity theory is adopted to predict the mechanical behaviour of soft sandstone under monotonic and cyclic loadings. In this model, the loading surface always passes through the current stress state regardless of the type of loading. Destruction of the cementation bonds by plastic deformation in the model is considered as the primary mechanism responsible for the mechanical degradation of loosely cemented sands/weak *** model cyclic response, the unloading plastic and elastic moduli are formulated based on the loading/reloading plastic and elastic moduli. The proposed model was implemented in FLAC2D and evaluated against laboratory triaxial tests under monotonic and cyclic loadings, and the model results agreed well with the experimental observations. For cyclic tests, hysteresis loops are captured with reasonable accuracy.