Study on the dynamic characteristics of high polymer cementitious Gobi soil under bidirectional vibration
Seismic disaster is one of the frequently encountered problems in geotechnical engineering in China,in order to study the change rule of dynamic properties of Gobi soil when subjected to seismic action,a large dynamic and static triaxial test system is used to simulate the excitation stress of the soil body when subjected to the joint action of longitudinal and transversal waves of earthquakes,and to study the influence of various factors on the dynamic shear modulus,damping ratio and residual deformation of the Gobi soil when subjected to bi-directional vibration of the Gobi soil after mixing a certain amount of polymer cementing material.The effect of two-way vibration on the dynamic shear modulus,damping ratio and residual deformation.The results show that:under bidirectional vibration,the dynamic shear modulus decreases gradually with the growth of dynamic shear strain,and with the increase of radial dynamic stress ratio,the dynamic shear modulus shows a tendency of increasing and then decreasing;the peripheral pressure and consolidation ratio are positively correlated with the dynamic shear modulus;when the phase grows within 0°～180°,the dynamic shear stress of the specimen under the action of bidirectional vibration increases,and the dynamic shear modulus increases,and the damping ratio is less affected by the various factors.Smaller.The residual deformation of polymer cemented Gobi soil decreases rapidly with the increase of polymer mass ratio;the dynamic residual body strain and residual shear strain increase at a phase difference of 180°.The preliminary results of the study show that the dynamic deformation characteristics of polymer cemented Gobi soil under bidirectional vibration can provide a reference basis for the application of polymer cemented Gobi soil and the seismic design of engineering.
万方数据
维普
