Path Planning And Scheme Evaluation Of Urban Underground Utility Tunnel

As an important engineering measure to achieve the sustainable development of urban underground space,the city's underground utility tunnel has attracted the attention of the society and the government.The planning and construction of utility tunnel has become an inevitable trend of social development.It is necessary to implement “planning ahead” in the process of building utility tunnel.How to do a good job in the planning work in the early stage,scientifically and reasonably realizing the effective use of underground space,and bringing into full play the economic and social benefits of an integrated pipe gallery is one of the issues that are currently facing.From the perspective of comprehensive pipeline network planning,this paper analyzes the differences in the functional characteristics of trunk tunnels and branch tunnels and sets up mathematical models to plan the trunk corridors.At the same time,the evaluation indicators and models are established,and the planning plans of the utility tunne are evaluated and compared in order to make the overall planning of the utility tunnel more scientific.This article mainly studies the following aspects:(1)Establish trunk tunnel planning model.This paper analyzes the characteristics of the utility tunnel planning,firstly proposes the appraisal system for the appropriative construction of the utility tunnel,and analyzes the appropriate construction of the utility tunnel for the roads in the proposed area.Secondly,the trunk tunnel must also pass through important urban nodes on the basis of considering the proper construction of the route.Therefore,this paper introduces the theory of complex networks,abstracts the urban road network into the network by the original method,uses the weighted complex network node contraction method,and calculates the degree of node importance based on the dissimilarity principle.Finally,a single-objective planning model was established to plan trunk tunnels.(2)Design a branch tunnel search algorithm.The branch pipeline tunnel mainly serves the surrounding users.Therefore,in the course of studying the utility tunnel planning of the branch line,the concept of tunnel service efficiency was proposed on the basis of considering the appropriate construction of the tunnel.At the same time,the artificial intelligence search method was introduced.Using the A* search algorithm,combined with the pipeline service rate of the branch tunnel,the construction of the tunnel and the length of the tunnel,the A* search algorithm evaluation function was designed,and the admissibility was proved.Finally,a dynamic multi-path planning algorithm is used to propose a search method for multiple non-repeating pipeline tunnels.(3)Utility tunnel path planning scheme evaluation.There are many factors that need to be considered in planning,but it is difficult to consider these factors simultaneously in the planning model.Therefore,on the basis of a certain plan for the trunk and branch pipeline tunnels,this paper proposes comprehensive pipeline corridor project evaluation indicators from the aspects of network topology,service quality,and economic and technical aspects,and uses “cloud model + entropy weight method” to establish comprehensiveness.Pipeline evaluation model,overall evaluation and comparison and selection of utility tunnel planning schemes.(4)Instance verification.In this paper,the old city of Shaanxi Province is selected as the actual project case.The planning model and the search algorithm for the pipe gallery established in this paper are used for the planning of the pipe gallery.The project comparison and selection are carried out and the optimal plan is obtained.The mathematic model established in this paper starts from the perspective of comprehensive pipeline planning for trunk and branch tunnels and comprehensively considers many factors that need to be considered in the actual planning.It can provide a new planning perspective,scientific planning basis,and quantitative planning for pipeline gallery planners.The method has important theoretical significance and reference value for the planning work in the early stage of comprehensive pipeline corridor construction.