Finite-element simulation of anti-frost behavior of trapezoidal corrugated-steel water channel
In order to study the anti-frost behavior of trapezoidal corrugated-steel water channel in frozen soil environment,the three-dimensional solid-shell finite element model was established,which could precisely simulate the interaction between the channel and soil.The prediction formula of elastic modulus of frozen soil was proposed considering the influence of water content and temperature.By considering the change of temperature field in different months,the soil-channel interaction in the actual warming and cooling process was simulated by using transient heat transferring.The deformation and stress of corrugated steel water channel were analyzed by considering the impact of water content and temperature on the constitutive parameters,such as elastic modulus,frost-heaving coefficient,internal fraction angle and cohesive force.The influences of water content,groundwater depth,space and geometry of transverse brace,width of flange slab and thickness of corrugated steel were investigated for the deformation and stress.The results show that the corrugated-steel water channel can be employed to resist horizontal frost-heaving action.The initial water content and depth of groundwater have significant influence on the deformation and stress,especially when the groundwater level locates in the lower part of the side wall of channel.The deformation can be reduced by setting several transverse braces,decreasing the slope of side wall,increasing the thickness,and widening the flange slab,among which the former two approaches are more economic and effective.Yet,the profile of brace should meet the stability requirement.The flange slab can provide some stiffness only when there are braces.Although widening the flange slab can reduce the top transverse deformation,it is minor within 10-100 mm of the width.The Mises stress in the channel is general lower than the yield strength value for the channel without brace,which is remarkable in the corner and bottom,while insignificant in the side wall.By setting the braces,the location of great stress has changed to the connections of flange slab and braces,where the steel can yield.
corrugated-steel water channelanti-frost behaviorfrozen soildeformationstress
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