Evaluation method of improvement effect of improved ground

摘要

Problem to be solved: to provide an evaluation method of the improvement effect of the improved ground which can evaluate the strength and rigidity of the improved ground on the supporting ground in a simple and short time.Evaluation method of strength of improved ground on support ground 1Before and after ground improvementAt the same observation position on the ground surfaceA known reference point P of the depth of support ground 1 isA plurality of microtremor observations are performed simultaneously with the reference point P and the observation point with interval.From the microtremor waveform by microtremor observationThe Fourier spectral ratio from the reference point P in each observation set is obtained.The peak period difference observed in the Fourier spectral ratio before and after the ground improvement is obtained.Based on the numerical results obtained separatelyThe strength and stiffness of the improved ground are evaluated from the peak period difference before and after the ground improvement.Diagram