Static And Dynamic Features Research Of Lime-Soil Compaction Piles In Collapsible Loess Foundation

The use of lime-soil compaction pile is a simple, economic and effective method for processing collapsible loess foundation. It has been widely used in recent years in hydraulic structure engineering. In order to have a system comprehensive understanding for lime-soil compaction pile foundation in a water transportation project with a dark canal located in Mahe Town Dingxi City. Based on the summarization of hydraulic structure engineering foundation for years, considering the current specification, combined the theory of pile-soil interaction and finite element analysis method, Based on large finite element analysis software ANSYS10.0 , this article build a model of single lime-soil compaction pile and soil in a dark canal. In the course of modeling, this paper first considered the 2d model of pile and soil system, then focused on the problem of the contact between the pile and soil. Finally analyzed the model under vertical load and horizontal earthquake load with static and dynamic method of the nonlinear analysis .Specific as follows:Static analysis of interaction with lime-soil compaction pile and soil. Firstly imposes reasonable vertical load on the top of single pile and soil model, analyzes the overall deformation and stress changes of pile and soil. Then change the parameters, such as diameter and length of the pile, the parameter of soil, to see pile and soil key positions deformation and axial stress changes, get results of of pile body sink and the influence of pile-soil stress variation in the upper structure through changing each parameter, in order to supply reference for looking into upper structural behaviour and related engineering designDynamic analysis of interaction between pile and soil. Time-history analysis is given priority to model mainly in horizontal seismic load, input reasonable seismic waves--El-Centro waves, to see the horizontal displacement and stress changes of pile-soil model of different nodes,get a lot of graphics and data, through the screening and comparative, analyzes the horizontal displacement and stress of different nodes in the schedule changes. Got deformation and stress displacement variation of single pile and soil in horizontal seismic load. Thus some conclusions are drawn.Through the analysis of the above two aspects, the results can be more accurately reflect the single pile lime-soil compaction pile and soil in the stress state and they produced under the joint action of the change rule. Thus for pile group - the soil - the upper dark canal structure interaction of analysis and pile and soil was whether to produce pile group effect lay a good theoretical basis. Also for related engineering design and the application in related engineering foundation provide certain reference.