Application of GERT in Time Management of Tunnel Construction Projects

Document Type : research - paper

Authors

1 MSc Student in Civil Engineering, Islamic Azad University, West Tehran Branch,

2 Assistant professor of Imam Khomeini International University

3 -Assistant Professor, Mining Engineering Department, Engineering Faculty, Imam Khomeini International University, Qazvin

Abstract

Tunneling projects are implemented over a relatively long time due to the limited work environment. In this case, project management and implementation optimization are very important. Various methods can be used to control and manage the project. Network methods are one of the effective methods. . The CPM and PERT methods are the most commonly used. The GERT method is also one of the most efficient networking methods and can be used for situations where there are potential activities in addition to time. Due to the complexity of the operation and also the unknown geological conditions in the tunneling, in addition to the uncertain timing of some activities, not all activities are necessarily definitive and some activities will not be performed depending on the conditions in each project. Therefore, in this study the used of GERT method in tunneling has been investigated and an example is shown for its used. In this example, first different tunneling operations are outlined for the project of constructing a large cross-section tunnel. Then, according to the type of each activity, the likelihood of execution and the time interval of execution are defined. Due to the technical and operational conditions, the relationship between activities based on the GERT network was shown. The method of network analysis was expressed in both manual and software. A numerical example was implemented using Risk Analysis Primavera software and different completion times were obtained for different project percentages. Conversely, the corresponding probability times can also be set for different predicted times. The project execution time is 2981 days with 50% probability and 3082 days with 80% probability.

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Main Subjects


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