Open AccessAn extended super/subloading surface model for soft rock considering structure degradation
Author(s) -
Kai Cui,
Bin Hu,
Aneng Cui,
Jing Li,
Erjian Wei,
Zhen Zhang
Publication year - 2021
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0258813
Subject(s) - dilatant , softening , geotechnical engineering , yield surface , yield (engineering) , constitutive equation , surface (topology) , materials science , geology , structural engineering , engineering , composite material , mathematics , finite element method , geometry
The strain-softening and dilatancy behavior of soft rock is affected by the loading history and the development of structure. This study regards soft rock as a structured and overconsolidated soil and develops a new elastoplastic model based on the classical super yield surface Cam-clay model. The proposed model is capable of capturing the effect of yield surface shape on the mechanical behavior of soft rock by introducing a new yield function. The proposed model is validated against the triaxial test results on different types of soft rocks under drained condition. The comparison results indicate that the proposed model is suitable for describing the constitutive behavior of soft rock.