Title The strength criterion and elastoplastic constitutive model of frozen soil under high confining pressures
Author Yang Yugui; Lai Yuanming; Dong Yuanhong; Li Shuangyang
Author Affil Yang Yugui, Chinese Academy of Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, State Key Laboratory of Frozen Soil Engineering, Lanzhou, China
Source Cold Regions Science and Technology, 60(2), p.154-160, . Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0165- 232X
Publication Date Feb. 2010
Notes In English. Based on Publisher- supplied data GeoRef Acc. No: 309598
Index Terms deformation; frozen ground; models; cohesion; soils; soil temperature; strains; stresses; temperature; confining pressure; constitutive equations; elastoplastic materials; failures; low temperature; shear strength; strain; stress; triaxial tests
Abstract A series of triaxial compressive tests of frozen soil has been conducted at a temperature of -6C under high confining pressures. The results verify that the strength of frozen soil increases to a peak value with increasing confining pressure, but with a further increase in confining pressure, the strength decreases for crushing and pressure melting phenomena under high confining pressures. In order to meet the needs of the engineering activities in underground works, where the frozen soil is under high confining pressures, a new failure criterion is proposed based on the experimental results. To analyze the deformation of frozen soil under high confining pressures, an elastoplastic constitutive model has to be established. In this study, the yield condition is proposed by employing an elliptical yield surface. The plastic potential surface depends on the same arguments, but a nonassociated flow rule is used. All parameters of the model are identified by tests. The validity of the model is verified by comparing its modeling results with the corresponding experimental results.
URL http://hdl.handle.net/10.1016/j.coldregions.2009.09.001
Publication Type journal article
Record ID 65006510