偶应力对含充填层状岩体边界层效应的影响

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Abstract The effect of material microstructure is not included in the traditional continuum theory. The microstructure size of rock material is usually above millimeter scale. Under high strain gradient condition，the bending deformation of layered rock mass is remarkable. Interfaces boundary layer effect of layered rock mass with inclusion is studied by adopting couple stress theory and finite element method. The results of the typical elasticity theory and the couple stress theory are compared. The results show that the absolute values of stresses and strains within interfaces boundary layer decrease. Under couple stress theory，the transition region of shear strain emerges near interfaces boundary layer. The abrupt change of the shear strain is relieved，but the shear stress is no longer continuous. The size of the region is influenced by the characteristic length，not by the second shear modulus，posion?s ration and elastic modulus.

Key words： rock mechanics couple stress layered rock mass with inclusion interfaces boundary layer effect finite element method

Received: 24 February 2011

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http://www.rockmech.org/EN/Y2011/V30/IS1/3288

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