(1. State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;2. Zhejiang Engineering Investigation Institute,Ningbo,Zhejiang 315010,China)
Abstract:Coarse aggregates of sericite schist are widely used in the construction of Gucheng–Zhuxi expressway as subgrade fillings. In order to study the mechanical properties of coarse aggregates of sericite schist,a series of large-scale triaxial tests under different stress paths were carried out,including the conventional drained triaxial,conventional undrained triaxial and constant p tests. All of the stress-strain curves under the low confining pressures exhibited the strain hardening phenomenon. However,the stress-strain curves exhibited the weak strain softening behavior under the high confining pressures. The volumetric strains were found to be mainly shear contraction under different confining pressures,and no shear dilatancy behavior appeared under low confining pressure. The reason of the abnormal strain change behaviour was explained through the analysis of the breakage characteristics of particles. In addition,it is verified that the Duncan?s nonlinear strength criterion has a good applicability for the sericite schist coarse aggregates .
薄宫林,小岛. 采用软岩弃碴的大型填土的设计和施工[J]. 中国铁道科学研究院译. 土与基础,1984,32(7):53-59. (BO Gonglin,KOJIMA Kobayashi. Design and construction of large scale subgrade filling with soft rock and waste slag[J]. Translated by China Academy of Railway Sciences. Soils and Foundations,1984,32(7):53-59.(in Chinese))
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