不同应力路径下绢云母片岩粗粒料力学特性试验研究

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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 .

Key words： soil mechanics coarse aggregates of sericite schist stress path mechanical property particle breakage

Received: 01 July 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I9/1932

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