Numerical Simulation On Bottom Pressure And Lateral Pressure Of Bulk Grain Pile In Large Warehouse

In order to achieve the goal of grain storage green and safety,control of grain physical field,biological field state variation factor,the establishment of multi-field coupling model is very important.The pressure field of bulk grain pile in large warehouse is the foundation of multi-field coupling model.At present,there are few research results of the pressure field in the warehouse can provide reference for multi-field.The establishment of pressure field can provide reference for grain inspection and optimized design of warehouse structure.In order to simulate the pressure field of bulk grain pile in large warehouse,the Duncan-Chang model was introduced and developed in FLAC3 D software.The Duncan-Chang model parameters were obtained through the wheat triaxial test.Based on the present method,the wall friction value's effect on the bottom pressure of the bulk grain pile was investigated,as well as the relationship between the bottom pressure of grain pile and the stack height.Comparison results of the bottom pressure of grain pile,between present numerical simulation and the corresponding experimental data,show the accuracy and applicability of Duncan-Chang(E-B)constitutive model.The friction force of silo wall is one key factor for the non-uniform bottom pressure.The numerical simulation results can provide pressure field data for the establishment of multi-field coupling studies.In this paper,the lateral pressure and friction of the wall are simulated and analyzed.The lateral pressure of the silo wall is linear with the depth in the depth range of 1~4.5m,and the slope of the curve is approximately the same as that of the standard curve,the results of simulation results is less than the standard formula.The simulation results of the measured lateral pressure values in the depth range of 0~1m are larger than those calculated by the standard formula.When the depth is close to 5m,the result is opposite.As to the friction of the silo wall,the results of simulation results is less than the standard formula in the depth range of 2~5m.The simulation results show that the friction force is approximately linear with the depth,and the slope is less than the standard value.The simulation result are larger than standard value,and increase first then decrease in the depth of 0~1m.Through the research and analysis,it is considered that the parameter k which affects the distribution of the lateral pressure and the friction force changes with the change of the confining pressure.The maximum static friction is the main factor leading to the above phenomenon.In this paper,the FLAC3 D software is introduced into the numerical simulation of bulk grain pressure field in a large warehouse in the first time,and the constitutive relation of the grain pile is introduced into the Duncan Chang model to calculate the stress in any position of the grain pile.The data of pressure field is established for the multi-field coupling model.