Study on the Effect of Loess Strength Induced by Different Action Methods of Stochastic Seismic Load

the seismic intensity and acceleration attenuation relationship of the field were studied used the method of regression and conversion analysis based on its macrograph intensity data in this paper, and the earthquake wave of the field with the 10% exceedance probability in the following 50 years was gained to carry out the dynamic triaxial test with sampled from Xia Da Lu village, Xi Ji county of Ning Xia Province, to research the effect of axes and surround dynamic load ratio, and damnification of loess strength induced by the stochastic seismic wave. The result shown that when the axes and surround dynamic load ratio k with a small value, the change of k could induce the transformation of loess strength limitedly, but along with the accretion of k, the bigger dynamic stress need to produce certain deformation, and if k>1, accompany with the increase of deviatonic stress, the smaller dynamic stress need. In addition, action of earthquake should damnify the framework of loess and reduce its shear strength in condition of lower concretion pressure, and the degree of reducing strength increased with the increase of amplitude of dynamic load, but if the sample in condition of higher concretion pressure, the bigger dynamic load should make the sample denser, produce bigger residual deformation and with higher shear strength.