Modeling And Simulation For The Traffic And Transportation System Of Underground Structure Group

With the proceeding of hydroelectric construction in our country, we will face the construction of underground structure group in more and more hydroelectric projects, and during the excavation of underground structure group, transportation is become the key process of controlling heading speed. Therefore, we must establish reliable measure of construction management, make out transportation road of inside and outside of hole and dump yard, choose the reasonable loading transportation equipment through calculating, and work out the dispatching opration way and safe operation measure of loading transportation equipment. The traffic transportation system of underground structure group is a kind of typical discrete event dynamic system, which is difficult to describe with analytic mathematic models. So far there are a lot of theoretical methods to analyze the discrete event dynamic system, among which Petri nets becomes one of the effective methods of studying discrete event dynamic system, for its perfect theoretical system, accurate systematic description to reality, convenience to use flexibly.Petri nets is applied in the simulation of the construction transportation system of the underground structure group in this paper. Because basic Petri nets is very inconvenient in modeling to the complicated system, and in colored Petri nets, one token color aggregation is defined for every place of the nets, and a movement color aggregation is defined for every transition of the nets. The token colure aggregation can make one token signify many kinds of resources, and the original place can only signify a kind of resource, expand the content of token represented, the movement color aggregation of transition can show the association condition that the more complicated events is happened at the same time. Therefore, in this paper, colored Petri nets is adoped to established the model of the traffic and transportation system of underground structure group with colored Petri nets. Four submodels of the transportation system are established: loading model, road model, model of interlace spot and unloading model of dump yards. Besides, the general simulation method of discrete event dynamic systems is dicussed and four kinds of simulation strategies based on Petri nets are introduced in this paper.In this paper, the case of traffic and transportation system of Shuibuya underground structure group is studied and some usable conclusions are obtained. After analyzing the simulation result, we optimize the reasonable plan of equipment sets and reflect the feature of dynamic transformation of the traffic and transportation system state.