Lateral Pressure Calculation Methods And Numerical Simulation Studies Of Large Diameter Squat Silos

As the fundamental research in the field of grain storage areas, the security problems ofsilos have been the important hot topic in the field of many scholars and experts. Therefore,the lateral pressure of silos is directly related to the strength and security of the silos. In thispaper, it modifies the lateral pressure formula of the silos, and gives further calculation of thecoulomb method. This paper will give some answers to the problems, which are found duringthe use of <Reinforced concrete silo design specification>. It will also provide an appropriatecalculating method for the lateral pressure. The major studies of this article are as follows:1. The main content of this part is theoretical analysis. It also raises the calculatingformula of the lateral pressure. According to the problems, which are found during the use of<Reinforced concrete silo design specification>(GB50077-2003),this article carries on somefurther researches about whether to ignore the silo wall friction when calculating the rupturingangle. Because we can’t confirm that it’s deep silo or shallow silo, so we should consider thesilo wall friction in the calculating formula of the rupturing angle. And it will modify theoriginal formula of the specification. Therefore, to simplify the calculation, we can ignore thesilo wall friction when we calculate the pressure of shallow silo wall.The working condition is judged by the formula for calculation of fracture, which is afterthe considering of friction. According to different working condition, the modified coefficientis discussed. Afterwards, the formula of modified coefficient can be obtained from thediscussion. According to relevant calculations, and comparisons between the computed resultsand experimental result, it will help to determine whether the modified coefficient is suitablefor the calculation of the silo lateral pressure. The goal of this paper is that it can make somecontributions to the further modification and perfection of <Reinforced concrete silo designspecification>.2. Model tests. In order to verify that whether the above formula is correct andreasonable, we make some relevant experiment. This paper does some researches about theexperiment, which is obtained by20times smaller than the real silo (made by organic glass).Moreover, the height of the model silo is1100㎜, the inner diameter is500㎜, and thethickness of the wall is5㎜. Firstly, we use the pressure sensors to measure the pressure values, which are in the different location of the silo wall. Then, to verify the reasonability ofthe formula, we will make some comparisons between the theoretical calculation andnumerical simulation values.3. Numerical Simulations. What numerical program this paper adopts is PFC3D.Through using PFC3D(Particle Flow Code in3Dimensions), we can build the silo model,which has the same size with the above silo model of the experiment. After setting the relatedparameters, we’ll simulate the actual stress distribution of the silo model. And then, we’ll usethe virtual literal pressure sensor to measure the lateral pressure values of the correspondingheight. Through the comparison between numerical values and theoretical values, we canobtain the following conclusions: the revised formula is more suitable for the calculation ofthe silo wall lateral pressure.