| In the plateau wetland highway design and increasing the large investment in the re-routes, the wetland weak foundation must be deal with. In view of the fact that the special function and the action of wetland at maintaining in the ecological equilibrium, wetland protection must be given dual attention in the dealing with wetland process. So it is the vital significance to choose the reasonable soft foundation methods.With the rapid development of civil engineering construction, gravel pile composite foundation has been widely used to treat the soft soil. Because of complexity of geological conditions and gravel pile composite foundation itself, now it has been discussing and studying gradually.Based on the field tests of lao-ji highway, it studies deeply the work mechanics and the calculation methods of gravel pile composite foundation through theory analysis, field tests and finite element analysis. Main contents and conclusion include:(1) In the full understanding plateau wetland characteristic, it is the science proper and environmental protection choice to use the gravle pile to deal with plateau wetland. The design and checking can be done in article.(2)The imitate analysis through plaxis software to engineering find: the negative friction force in upside of gravel pile, the max stress below the top of pile, the ratio of pile and soil increasing as load heavy, the exceed pore pressure dissipation quickly due to channels of gravel pile, the small of settlement.(3)Geogrid in the pile may restrict lateral displacement, decrease the discrepancy settlement and control the total settlement.(4) Be short of guidance in criterion, construction quality can be control by the combine of gravitation sounding test and engineering geophysics. Geophysics is effective and applied extensively on project prospecting and foundation inspecting.So it is the science proper and environmental protection choice to use the gravle pile to deal with plateau wetland.
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