Three-Dimensional Discrete Element Method And Its Application On The Metropolitan Pipeline Engineering

Discrete element method was developed by 1970s,It is a numerical analysis way which was used to analyse the rock distortion. After that ,some scholars noticed its especial strongpoint and applied it to the other fields. However, most of them are of two dimensions and the research of the three dimensional element method on many respects is only be forepart.Based on the computer simulate experiments, model experiments and some extent theoretic analysis, a three dimensional discrete element method was improved,a technique of the cell contact discerntion was studied and a way of seeking the parameters was discussed. This paper used the chain-form search to discern the cells' contact and replaced the traditional full-form search method. In addition, rational choose the parameters is an intractability. At first, this paper analysed the model stability by the temporal curves of velocity and temporal curves of diplacement. And then,the relations between parameters and velocity distribution were studied by temporal curves of variances. At last,the correctness of the model was validated by physical experiments.The city pipeline engineering consists of feedwater pipe,rainwater pipe and sewage pipe, is a part and parcel of the municipal engineering.In the process of constructing the city pipeline, a technique was demanded to analyse the slope stability, so that we can forecast the trend of slope destroy.The 3-DEM is fit for analyzing the non-continuous and the great transfiguration and thus it is fit for analyzing the slope destroy.This paper simulated an example by using the 3-DEM software, and the result demonstrates that it was feasible.