Large Diameter Drilling Shaft Steel Plate Concrete Composite Wall Structure Research And Application

Drilling method of drilling is a coal mine shaft through one of the most effective method in deep alluvium.Along with the drilling borehole dia meter increase,to resist the deep alluvium strong soil and water pressure,must use higher strength of shaft wall structure.But due to the limitation of construction equipment lifting capacity,this limits the increase of wall thickness has become one of the big support of large diameter drilling shaft problem.To this end,this thesis in huainan mine to the west wind as the engineering background,the well was carried out by large diameter,thickness is relatively thin double steel plate of high strength concrete composite wall research and application.First,in terms of theoretical analysis,steel plates are assumed to be Mises criterion,concrete the Coulomb-Mohr strength criterion,theoretical analysis for the ultimate bearing capacity of the shaft wall.Then,according to the similarity theory,model test of similarity criterion,is derived through the model design,the double steel plate,high strength concrete composite wall structure model test for this kind of shaft wall stress,deformation and strength characteristics of the structure,and according to the test results,based on the structure analysis and limit equilibrium condition,established a large diameter,thickness is relatively thin double steel plate of high strength concrete ultimate bearing capacity formula of composite wall structure.Secondly,based on the finite element software ABAQUS,analysis model is established,and the numerical analysis model of the structure,the double steel high strength concrete composite wall and the re lationship between various influencing factors of bearing capacity,and according to the calculation results,return for bearing capacity of large diameter drilling shaft steel plate concrete composite wall regression formula.Finally,on the internal and external force wall construction field monitoring,the lateral pressure and the concrete stress value,for large diameter drilling shaft lining design and construction to provide the basis.