Research On Progress Optimization Of Railway Engineering Technical Interface

As a large-scale infrastructure project,railway engineering has the characteristics of long construction cycle,large investment scale,wide coverage,and difficult management.The interactions among the various subsystems included under it have resulted in a large number of technical interfaces.With the increasing size of the engineering system and the refinement of the construction content,it is increasingly difficult to control the complexity of technical interfaces and the uncertainty of the project duration.The progress of technical interfaces is a key link that affects the progress of the entire railway project construction.How to control and manage the progress of technical interfaces to ensure the progress of the entire railway project construction has become one of the focuses of railway project construction management.Therefore,this article takes the railway engineering technical interface as the research object,sorts out the dependencies between technical interfaces,analyzes the mechanism of the dependencies on the progress of technical interfaces,evaluates the importance of technical interfaces,and finds key technical interfaces.On this basis,combined with the relevant theories of interface exchange,the information resource exchange and physical resource exchange of technical interface processes under overlapping and parallel construction are analyzed,the interface construction period is calculated,and it is controlled and optimized to ensure the timely completion of the project.Firstly,through system division of railway engineering,each subsystem of railway engineering is decomposed in detail using EBS method,and the technical interface of railway engineering is identified using the technical interface matrix identification table;Sort out various dependencies between technical interfaces,establish a fuzzy dependency matrix for technical interfaces based on FUZZY-DSM,and quantify the dependency strength between technical interfaces;Based on this,combined with CNT theory,a directed weighted technology interface dependency network graph is constructed using technology interfaces as nodes,dependencies between technology interfaces as edges,and dependency strength as edge weights;Establish a technical interface transfer capability matrix based on the CCM and LCM of each interface node in the technical interface dependency network diagram,evaluate the importance of each technical interface,find key technical interfaces,conduct a cascade failure propagation analysis of construction delay,find the threshold value for construction delay control of key technical interfaces,and provide a theoretical basis for progress control of technical interfaces.Secondly,for key technical interfaces,a network diagram of technical interface processes is established based on the information interaction between the interface processes,and the Monte Carlo method is used to estimate the duration of the interface processes;Based on the relevant theories of interface exchange and concurrent engineering,and analyzing the impact of information communication transmission and feedback on the construction period of technical interface processes under overlapping and parallel construction,determine the rework time,and propose a reasonable range of overlapping and parallel interface processes by analyzing the impact of different degrees of overlapping and parallel interface processes on the rework time and total construction period;On this basis,for rework caused by overlapping and parallel interface processes,based on buffer management theory,buffer management is conducted for the duration of technical interface processes from both physical resources and information resource constraints,and relevant strategies for buffer management are proposed.Finally,select a certain section of a railway project as the research object,identify 15 technical interfaces,quantify the strength of the dependency relationship between technical interfaces,construct a directed weighted technical interface dependency network diagram,calculate the transfer capability matrix and node importance of technical interface nodes,and determine that the key technical interface is the subgrade and tunnel foundation treatment interface.On this basis,Define the direction of information transfer between the interface processes of the subgrade and tunnel foundation treatment interface,construct a network diagram of technical interface processes,and analyze the impact of the exchange of information and physical resources of the interface processes under overlapping and parallel conditions on the duration of the interface process.Compared to the result of not considering the overlapping execution of the interface processes,the total duration of the interface is reduced by 23.84%,and the rework time is reduced by 11.36%,That is,considering overlapping execution between interface processes can effectively shorten the project duration.Finally,the buffer management was performed on the technical interface construction period,resulting in a construction period buffer of 13.53 days,with a total construction period of 106 days.Compared to the total construction period of the interface without considering overlapping and parallel interfaces and buffer management,the total construction period was reduced by 38.37%,and compared to the total construction period of the interface with only overlapping and parallel construction,the total construction period was also reduced by19.08%.The research in this article provides a certain reference value for the progress control of railway engineering technical interfaces.