Analysis And Study On The Survivability Of Railway Network

China is vast in size. The railway extends in all directions and be barrier-free, take a large span of economic ties and interaction of transport work. In the case of high capacity and unexpected events occur, the road network function will be damaged more or less, or be paralyzed. It needs to take immediately emergency measures to make the rail network return to normal as soon as possible. The rail network is characterized by invulnerability adapts to respond to emergencies and recovery capabilities, with high survivability of the rail network to meet the demand for transport and network status changes, and can return to normal. Therefore, this paper focuses on the rail network survivability assessment and emergency restoration under study the issue of work includes the following five components:1. Propose the concept of the railway network system and analyze their composition. Railway network system is divided into the physical network and railway transport network. Tthe characteristics of the railway network is studied in terms of exoteric, dynamics and non-self-organization. On this basis, the network mdel of railway network, and analyze the complex characteristic of China's railway network. This is the theoretical research basis for the subsequent chapters.2. Propose definition of invulnerability of railway network, the invulnerability of the railway network is summed up the emergency, adaptability and resilience. On this basis, the invulnerability model of ailway network is proposed, which describes the whole process from the occurrence of unexpected events to the stable state which is made back to by taking repairing and scheduling measures. Finally, the invulnerability framework of the railway network is studied.3. Propose survivability assessment method of the railway network. The survivability assessment indexs of railway network is proposed from the aspects of both network topology and network performance. The index is calculated on the basis of changing in network performance under the emergency and normal situations. Finally, the survivability of railway network is assessed and analyzed at the background of the 2008 snowstorm.4. Studied the repairing methods of physical network under emergency. The concept of key nodes and key sides is gived and the affecting factors are analyzed. The identifying method of key nodes and key sides which consided the traffic demand between nodes and freight priority is proposed from the aspect of the contribution to the railway network after node or side repaired. On this basis, the repairing timing program is given under emergency.5. Studied the railway evacuation schemes problem. The railway evacuation schemes under emergency are divided into passenger evacuation schemes and freight evacuation schemes. For the railway passenger evacuation schemes, the optimization method of railway passenger transportation route is proposed aiming the large passenger transport volume and same destination. For the railway freight evacuation schemes, the dynamic service network model which conside vehicle allocation problem is built according to the operational characteristics of nonstop, whole train transportation and transportation priority. The objective is the maximum of the satisfaction to transport demand and vehicle utilization. A relaxation algorithm which is sub-optimization method by time-cycles is desiged to solve the above model. The feasibility and effectiveness of the proposed model and algorithm are verified by an example analysis.