Study On The Key Technologies Of The Expressway Service Area Planning

As a infrastructure of modernized transportation, the expressway improves the development of social economy and the living standards of the people. With the rapid development of the expressway in the world, its important status and function are known by people gradually. The domestic study on expressway mostly concentrate in such aspects as the planning, design, construction of its subject project at present. But the research of its important component, the expressway service facility, is still at the starting stage. A series of questions have exposed in the course of planning and construction of the service area of in our country. Because systematic theory and the method are short, we should make more urgent study on expressway service facility. Because of it, the writer spreads out research on the key technology of service area planning in the expressway basing on'Hebei Province Communications Department Science and Technology Project and the Study on Theory and Method of Expressway Service Area Compatibility Appraisal and Synthesis Plan Layout'. Based on analyzing the characteristics of the expressway service area and the service object, the paper approach relevant theories and the technology of the expressway service area planning. The core study of the paper is two key technical questions: one is how to build the transportation potential calculation model of expressway service area, another is which method can be used to calculate the scale of service area.First of all, the writer analyzed the current situation of the service area in expressway, according to the expressway situation of our country and the plan for future. And the writer point out that the study on theory and method of service area planning is also very weak and illustrate that the research of the paper is significance. on the basis of reviewing to the existing theory and method. Yet, the theoty and practical value are put forward.Secondly, based on the analysis to the characteristic of field system, the writer put forward the transportation potential to calculation the pause rate of the expressway service area. Traditional research means is to divide the pause rate into several types according to the number of the pause rate on the basis of investigating, regarded as the external analytical method and there was not inherently explain the formation mechanism of the pause rate. Through the analysis to the transportation field of expressway, the paper explains the inherent mechanism of the emerging of the pause rate and establish the transportation potential calculation model. The analysis of the living examples shows that: the transportation potential calculation model can comparatively fix the pause rate of the expressway service area accurately.Thirdly, the paper have set up a model to calculate the scale of the service area in the expressway, based on the reaching law of the demand person. According to the randomness characteristics of arrival and service time of the serivced object, it builds a queue theory model about the service area in the expressway. And queueing indexes are presented in definition of the service levels of the functional facilities in the service area. Then on the basis of the service levels that are up to the demand , the optimal scale of the service area is calculated by the queue theory model.Finally, combined with the planning project of the service area in expressway in Hebei, the research results of this text is proved. The aim is to introduce the method calculating driving-into rate model and the way of scale calculation into the application of the planning.