The Geotechnical Centrifuge Model Experiment Study of the Slope Soft-Soil Foundation Improved by Cement Soil Mixing Method

This essay takes a research site of the capacity expansion and conversion project from Dazhou to Chengdu as the prototype,designing 5 groups of indoor geotechnical centrifuge model tests based on the foundation treatment of the cement soil mixing method,and analyzing the strengthening effect of different piles layout under loads of embankment and the influence about the pile-soil load-sharing and the pulling force of the reinforced cushion geogrid. Analysis shows that the non-uniformity of the slope soft-soil foundation in structure affects significantly on the foundation's mechanical response,such as the pressure distribution and load-sharing. Unloading effect and the adjustment of pile-soil load-sharing may occur with the increasing depth. The use of the varying pile spacing mode can adjust the distribution of pile-soil pressure,and better adapt to the change of the thickness of the soft-soil foundation and improve the uniformity of foundation strengthening. The pulling force of the reinforced cushion geogrid is affected by many factors,for instance the embankment loading,the thickness of soft-soil foundation and the pile spacing arrangement. Its distribution pattern has significant feature of the asymmetry. There is good consistency between the appearing position of the maximum value and the possible deformation location of the slope soft-soil foundation.