Research On Vertical Bearing Capacity Of Composite Shaft Lining Structure Of High Strength Concrete And Double Steel Cylinders

Recently,with the new vertical shaft of coal mine cross-over special thick alluvium,the composite boring shaft lining structure of high strength concrete and double steel cylinders,is more and more widespread availability.But in special strata of drainage depression,shaft lining will subject to huge vertical additional force.And in the past the research according to the force mechanics of composite boring shaft lining structure of high strength concrete and double steel cylinders,is carried out under horizontal load.The vertical force property of this kind shaft lining is lack currently.In orde to clear up the the vertical capacity's property and make the design not only economically and reasonable but also safe and reliable,its vertical bearing capacity is systematically researched by the combination method of theory analysis, physical simulation tests and numerical simulation calculations in body matter.Firstly,the sectional stress of this shaft lining structure are analyzed by theoretical analysis,and on base of concrete multi spindle strength theory,a approximate formula for calculating the vertical bearing capacity of the shaft lining is deduced.Secondly,a structure experiment's similarity rule is established by physical simulation tests.The model is designed and processed.Then the shaft lining model's deformation and vertical bearing capacity and the increased coefficient of concrete compression strength in the shaft lining structure through the load-on experiment.And puts forward a formula for calculating the vertical capacity of the shaft lining Thirdly,the data of the vertical bearing capacity of the shaft lining is getted from numerical simulation calculations by ANSYS software,then we find that the result of vertical bearing capacity and the result by physical simulation tests is anastomotic,it indicate that researching shaft lining by numerical simulation is feasible.This paper's conclusions can be used for designing the bearing capacity of the composite shaft lining structure of high strength concrete and double steel cylinder and contractile shaft lining junction as a reference.