| The total mileage of expressway in China had reached 5.3*104km at the end of 2007 after 20 years'rapid development,which puts China in the second position in the world.The freeway network will reach 8.5*104km by 2020,approaching the USA in term of total mileage.The maintenance of motorway pavement is becoming more and more important in order to keep the performance of the road service in terms of safety,confort,speed and economics. Pavement Management System (PMS) is very important during the course of road maintenance.PMS is a kind of scientific management mode and a tool for assistant decision. It is distinct from the traditional decision mode that depends on human experience. So PMS is of benefit to the systematism, scientificity and modernization of the pavement management decision, and good for making best use of the pavement resource. Pavement Maintenance Management System (PMMS) is one of the subsystems of PMS. With the development of expressway construction and the gradual formation of expressway network in China,the problems about the maintenance of expressway have become more and more important and prominent. There is lack of uniform standard and criterion of expressway maintenance in China,and the expressway maintenance modes is different in different region. So the study in the thesis is of great significance to the sustainable development of expressway and regional economy. And it is of practical significance to the management decision-making work in maintenance management department and express management department.According to the present situation of maintenance management of China expressway, the maintenance management decision problems of network-level expressway in province region are regarded as the study objects. Based on the evaluation and prediction of pavement performance, the main frame of decision optimization of PMMS for network-level expressway is proposed.The optimization model of pavement maintenance fund allocation is established.The key content of the thesis is the decision optimization of PMMS for network-level expressway. The goal of the decision optimization is to establish the plan of the pavement maintenance and the scheme of the fund allocation. Firstly the main frame of study on decision optimization of PMMS for network-level expressway is proposed according to the application situation of the decision optimization methods in the field. Secondly the requirement and measure of PMM are analyzed. The concepts of combination state and the transition probability of the combination state of pavement performance are defined. The calculation method of transition probability of the combination state is studied- Then the method of minimizing the weighted sum of deviation square that is kind of group ranking method in mufti-object decision-making is used in the ranking of PMM The ranking of the pavemern maintenance for the different routes in the network is discussed. Finally the pavement maintenance fund allocation of network-level expressway is studied emphatically. Combination of the ideas of dynamic planning and Markov decision planning,the Markov Decision Planning (MDP) Model for the optimization of pavement maintenance fund allocation is established. At the same time, the existence of the optimum relation of MDP model and the feasibility of the calculation method applying linear planning method are discussed. The core arithmetic of linear planning according to optimum relation on cutting hyperplane is put forward. The core arithmetic is used in the two kinds of model, one is the financial planning, and the other is the project planning of the PMM fund allocation. |
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