Requirement for Error Control of Nonlinear Experiments of Soils

Abstract eng:
Many researches in recent years have approved that the nonlinear behavior of soils has significant effect on the surface ground motion. The laboratory experiments on the relationship of the shear modular and damping ratio with the shear stain are complicated generally and existing results from various devices may be different in great extent. The experiment technique should be improved and the error should be limited in engineering accuracy. Therefore, the standard of error control should be provided, which is important for further work both on the experiment skills and improvement of equipment itself. However, there is an obvious shortage in the study on the standards of error limitation of the experiments results. In this paper, the requirement for the error control of the experiments on the soil shear modular and damping ratio with the shear strain is studied and specification of accuracy limitation of the experiments is presented. The one of the key points in the paper is that establish relationship among the soil nonlinear proper variation, the surface ground spectrum and the spectra, and the other is that the structure response is taken as the base of measuring the soil nonlinear variation. The effect of the experimental error of the soil shear modular and damping ratio on the acceleration spectrum is investigated by using the simulation method. The typical models of soil layers under various kinds of inputting seismic waves are employed in the analysis first. Then, the specification of the error limitation of the soil shear modular and damping ratio is determined by the extents of the corresponding structure responses. Through the analysis, the standard of measuring accuracy of the soil shear modular and damping ratio with the intensity of the inputting seismic waves is attained and the scope of the soil shear strain with the intensity of the inputting seismic waves is also presented.

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