自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 24    No. 3    March 2017

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Elastoplastic modeling of mechanical behavior of weak sandstone at different time scales
WANG Jing-yin(王京印)1, ZHANG Yu(张玉)2, 3, JIA Yun(贾赟)3, JIN Pei-jie(金培杰)2, ZHU Li-hong(朱丽红)1

1. School of Petroleum Engineering, China University of Petroleum, Qingdao 266555, China;
2. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266555, China;
3. Laboratory of Mechanics of Lille, University of Lille 1, Villeneuve d’Ascq 59655, France

Abstract:A unified constitutive model is proposed to describe the mechanical behavior of weak sandstone at different time scales. The instantaneous behavior of this material is characterized by the Drucker-Prager elastoplastic model, while the time-dependent deformation is described in terms of the microstructure evolution. This evolution is numerically simulated by progressive degradation of the elastic modulus and failure strength of the material. The proposed model is used to simulate the instantaneous triaxial compression and the multi-loading creep tests. Generally, good concordance is obtained between numerical simulations and experimental data. The proposed model is capable of describing the main features of these rocks, particularly irreversible deformations, pressure dependency, volumetric transition between compaction and dilatancy, and creep behavior.

 

Key words: weak sandstone; elastoplasticity; creep behavior; constitutive model; microstructure

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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