Path Planning Of The Underground Integrated Utility Tunnel In Urban Areas From The Perspective Of Vulnerability

Urban integrated utility tunnel construction is an important embodiment of city sustainable development concept,which is a great importance to improve the urban functions.Urban integrated utility tunnel is a primary work and major initiative as the the trend of future urban development,especially,at contemporary time when land resources are so valuable.Meanwhile,how to do the path planning work in the early stage of construction is need to be solved,which can make the integrated utility tunnel construction more scientific and effective,then maximize benefits.Based on the analysis of the main factors influencing the path planning of the integrated utility tunnel,this paper puts forward the concept of geological vulnerability and fragile road segment from the perspective of vulnerability,and expounds the close relationship among them.Then a single-target programming model with multiple constraints and a multi-target programming model with multiple constraints are set up respectively from the perspective of vulnerability.Different algorithms are used to solve and form a variety of specific path schemes.The main research contents of this paper are as follows:(1)The vulnerability evaluation index system is established according to the content of engineering geological evaluation on the basis of the concept of geological vulnerability.Then the corresponding geological vulnerability assessment model is established by using the method of the information entropy and interval number variable weight comprehensive correlation to provide geological constructive analysis.(2)The concept of the fragile road segment is put forward according to the relationship between the integrated utility tunnel construction and the road;then thefragile road segment identification model is established to give a quantitative judgment standard and method which about the priority of the section in building utility tunnel,all of these based on connecting factors affecting road vulnerability traditionally and selecting the pipe section.(3)Based on the requirement of vulnerability,a single-target programming model with multiple constraints is established when the scale of the integrated utility tunnel meets demand and the lowest path cost is regarded as a fundamental goal,then the improved ant colony algorithm and basic ant colony algorithm are used respectively to get different path schemes.Finally,results show that the improved algorithm is superior;The multi-target programming model is established with the largest road vulnerability,the lowest geologic vulnerability and the shortest path,the validity and scientificity of the improved ant colony algorithm are verified and formed,forming a variety of urban underground integrated utility tunnel path planning method.Finally,a practical project is used as a case to validate the model.Selected lines not only conform to the actual integrated utility tunnel line layout,but also consist with the theoretical analysis,the results show that factors considered in this paper are reasonable and methods are practical.This paper provides a practical and feasible guiding ideology and method for the formation of a large-scale integrated corridor planning network.In this paper,a variety of underground integrated utility tunnel path planning model are established from the perspective of vulnerability,which provides a unique planning perspective,scientific design basis and system operation method for the designer.Thus,it has important theoretical guiding significance to the preliminary planning work of the urban integrated utility tunnel construction.