Analysis And Research On Trait Of GanDa Highway Gravel Pile Composite Foundation

The gravel pile composite foundation is widely used in the foundation treatment in current project, but the theoretical research on which is still lagging behind. In particular the gravel pile composite foundation subsid calculations, and the scene of the subsid value of the measured difference between the relatively large; The calculation of bearing capacity is still semi-empirical, semi-theoretical, and the accuracy of the calculation results is mostly decided by the calculator's practical experience and the quality of parameter quality provided in the field trials. Study on numerical simulation of soil stress and strain have some advantages, And is gradually used to guide the practice of engineering in recent years.This thesis adopting the project which use the gravel pile to deal with the soft soil foundation in the section of K38 +150 ~ K38 +300 in GanDa expressway, deeply discuss the mechanism of soft soil subsid and gravel pile composite compound, and focus on the numerical simulation.Firstly of all, it is introduced that the GanDa expressway soft engineering geological characteristics and analyzed its physical and mechanical properties. it is calculated the subsiding value and consolidation time of soft soil foundation under the road bed load,and adopting numerical simulation software analyzed the stress-changing laws of soft soil foundation when the road bed loads and loads hierarchically,and then explained the theory and appraisaled of stability.Secondly, it is analyzed that the gravel pile-compounding the foundation and strengthens mechanism, and destroys the mode. it is discussed that the thoughts of the loading strength and subsiding calculations and design theory when the gravel pile-compounding the foundation. and adopting numerical simulation software analyzed the stress-changing laws of the gravel pile-compounding foundation when the road bed loads and loads hierarchically, and then explained the theory and appraisaled of stability.Thirdly, adopting of numerical simulation software it is simulated the stress-changing states of gravel pile-compounding the foundation under road bed load using different design parameters.and compare the imitating results with evaluating, put forward a best scheme of dealing with soft soil foundation by gravel pile.