Triaxial test and numerical simulation verification of dilatancy characteristics of cemented soils

Subjects: Mechanics >> Solid Mechanics submitted time 2023-06-21 Cooperative journals: 《应用力学学报》

许胜才 蔡军 甘彬宏

Abstract：
The dilatancy usually occurs in cemented soils materials when it is at failure by shear,but the constant dilatancy angle model based on Mohr-Coulomb strength theory at present cannot correctly express the nonlinear volume change behavior of cemented soils materials during deformation and failure.Therefore,according to the triaxial test of cemented soils under different cement ratios and confining pressure conditions,combined with the theory of plastic mechanics,the model of dilatancy angle affected by the uniaxial compressive strength,equivalent pressure stress and equivalent plastic strain simultaneously is established with a nonlinear fitting method,and then,the model of the dilatancy angle is verified by numerical simulation using finite element technology.The results show that the stress-strain curves of the cemented soils triaxial test is a softening type,and an obvious volume expansion will be generated when the cemented soils is damaged.The dilatancy behavior of cemented soils is usually quantified by the dilatancy angle.The dilatancy angle model under the influence of equivalent pressure stress and equivalent plastic strain can reasonably express the nonlinear volume change behavior of cemented soils after the peak stress,and the simulation results are in good agreement with the test results.However,if the dilatancy angle is taken as a constant value,the dilatancy effect will be overestimated or underestimated,and it cannot correctly reflect the law of nonlinear volume change of cemented soils after the peak stress.

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