Study on the mechanism of the influence of non-squeezing pile on seismic liquefaction in sandy soil
Enhancing the effective anti-liquefaction capacity of foundations through engineering measures has been an important research focus in the field of geotechnical engineering in recent years.As a commonly used measure for foundation treatment,whether the anti-liquefaction capacity of the stratum can be improved after the reinforcement of non-squeezing piles is still controversial in the academic community,mainly because the mechanism of its influ-ence on sandy soil liquefaction is not clear.In response to this problem,this paper carried out geotechnical centri-fuge model test on the undisturbed sites with dry sand and saturated sandy soil and the sites reinforced by non-squeezing pile.By comparing the dynamic response and the development law of excess pore water pressure of the stratum in different experiments,it has been found for the first time that the mechanism of non-squeezing piles on the stratum is not only the"stiffness effect",but also the additional force generated by the deformation mismatch between the pile and the soil during the vibration process.This additional force will significantly increase the stress and strain level of shallow soil,increasing its possibility of liquefaction.With the increase of buried depth,this ad-ditional force gradually decreases,and the"stiffness effect"will gradually become the dominant factor.The relevant research results can provide some basis and support for further revealing the anti-seismic reinforcement mechanism of non-squeezing piles and evaluating its reinforcement effect.
non-squeezing pilesand liquefactionstiffness effectdeformation coordinationgeotechnical centri-fuge model test
万方数据
维普
