Design of sand-absorbing retaining wall and its protection benefit analysis
In order to solve the problem that the sand particles always bury the sand retaining wall,and result in the reduction of the protective effect of the sand retaining wall,in this paper,the numerical simulation is carried out to analyze wind velocity changes around the sand-absorbing sand retaining wall with different parameters based on the RANS method in the k-ε turbulence model and the porous medium model,and the wind tunnel tests are used to verify the correctness of the turbulence model and the mesh delineation strategy selection.The results show that the wind-sand flow passing through the sand barrier wall will form five velocity zones:the deceleration zone in front of the wall,the partial acceleration zone behind the wall due to the wall structure,the acceleration zone directly above the wall,the vortex zone behind the wall,and the recovery zone.As the porosity of the wall decreases,the larger the effective sheltering area are on the leeward side,the closer the sand accumulation location is to the wall on the leeward side.The optimal porosity of the sand-absorbing retaining wall ranges from 25％to 35％,and considering the manufacturing process,it is advisable to choose a porosity of 35％.The sand-absorbing function of the sand retaining wall designed in this paper is good,and the magnitude of the sand-absorbing volume is positively correlated to the porosity and the incoming wind speed.The horizontal wind speed around the sand-absorbing retaining wall increases gradually from"U"-shaped to"V"-shaped distribution with the increase of height,and the wind speed contour shows an inverted"S"-shaped distribution in the vertical direction.When the wind speed is certain,the effective protection distance increases with the increase of the height of the sand retaining wall,and the range of sand accumulation increases.When the height is certain,the location of sand accumulation gradually shifts to the downwind direction with the increase of the incoming wind speed.The higher the sand retaining wall is,the greater the wind pressure is,and the higher the cost of the project is.So,considering the protection distance and the cost of the project,the wall with four sand barriers is the most reasonable design.
NETL
NSTL
万方数据
