关键词: 交通工程, 交通网络, 耦合映像格子, 道路故障, 级联失效

Abstract: In order to quantify the fault evolution rule of road traffic network, an analysis method of cascading failure of traffic network based on the coupled mapping lattice (CML) was proposed. Using L-space method, taking intersection as node and road as edge, the urban road network in Tongzhou city was abstractly dealt with. The characteristics of the urban road network in Tongzhou city were analyzed by using node degree K, node betweenness B and node strength S. Considering the influence of road network topology and flow characteristics comprehensively, a fault evolution model based on CML was proposed, and the influence law of cascading failure of road network under different combination of external disturbance and coupling strength was analyzed by simulation. The research indicates that: the larger the external disturbance R is, the more likely cascade failure will occur. The successive fault threshold is 1.6 at the maximum node of the deliberate attack betweenness B and 1.8 at the maximum node of the deliberate attack intensity S, which indicates that the topological network is more unstable than the flow distribution network, and the nodes with large betweenness must be protected. When the coupling coefficient ζ2 of weighted flow distribution is unchanged, no matter how the network topology coupling coefficient ζ1 changes, cascade failure will occur in road network, and the time and diffusion speed of successive failures in network are consistent. On the contrary, when ζ1 is unchanged, with the increase of ζ2, cascade failure will occur more easily.

Key words: traffic engineering, traffic network, coupled mapping lattices, road fault, cascading failure