Experimental study on mechanical properties of inherent anisotropy sand under pure principal stress rotation
[Purposes]This paper aims to reveal the effects of inherent anisotropy and deviatoric stress q on the mechanical properties of sand and deepen the understanding of soil dependence on stress direction.[Methods]Hollow cylinder specimens of sand with inherent anisotropy were prepared by using a new specimen preparation device.The hollow cylinder apparatus was used,and a series of undrained pure principal stress rotation tests were carried out under conditions of different bedding plane α3 and q.[Findings]During the pure principal stress rotation,the critical rotation cycle of sand varies with the change of α3 or q,and the maximum numerical difference can be 9 times.The accumulation rate of pore pressure in the early stage is also related with α3 and q,but the stable pore pressure value in the middle stage is less affected by the two parameters.With the increase in α3 and q,the accumulation rate of shear strain is accelerated,and the area of hysteresis loops and the dip angle also change.[Conclusions]The dynamic properties of sand,such as strain development patterns,pore pressure changes,and shear stress-shear strain relationship,are all closely related with the inherent anisotropy and q,and changes in q affect the relationship between the inherent anisotropy and the dynamic properties.
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