Research On Liquefied Soil-pile-slab Lateral Dynamic Intreaction Test

This paper focuses on the research of liquefied soil-pile-slab lateral dynamic response tests,which include two types of samples, sand and gravel soil, and analyze about the non-liquefiedand liquefied perspectives. By different forms of the sine wave and seismic wave input，detailedstudies of dynamic response of slab and p-y hysteresis curve of pile in different workingconditions are performed and it achieves plenty of valuable results. The main content includes：.First of all, the advanced FBG data acquisition system is introduced in three parts:acquisition principle, instruments and data processing. A new curve fitting method is putforward based on the characteristics of FBG. It has been proved by experimental data that thismethod is effective with high accuracy.Secondly, the researches on liquefied soil-pile-slab lateral dynamic interaction tests arestudied, which include the method of selecting soil samples, the method of making model boxand model pile, sensor selection and layout, and test conditions design. The non-contact laserdisplacement and the FBG data acquisition system used in the field of geotechnical arerelatively rare at home and abroad.Then the test data are analyzed by the comparison of the acceleration and displacementbetween the shaking table and slab, which shows that the shaking table and slab have similarforms of motion and the difference increases by the peak acceleration in non-liquefied test; inliquefied test, the acceleration and displacement increases rapidly along with the soilliquefaction. Tests of seismic wave can get the same conclusions.At last, the p-y curves of pile-soil-slab are investigated. Through comparing the p-yhysteresis curves in different peaking acceleration, it presents that the press of the pile andlateral displacement increase with peak acceleration, and the increase rate of displacement aremore distinct. And the area of p-y hysteresis curves increases correspondingly. In saturationtests combined with pore water pressure ratio, the p-y hysteresis curves are analyzed, whichshows that the slope of p-y curves decline, the relative displacement significantly increase andthe area of p-y curve hysteresis increase as well.