Assessment of Double Shield TBM performance by using downtime index (DTI)

Document Type : Research Paper


Department of Engineering Geology, Tarbiat Modares University, Tehran, Iran


In mechanized tunneling, TBM performance prediction is vital to estimate the time and cost of the project.
Therefore, calculating the performance parameters is so important. The utilization coefficient depends on
management parameters, personal ability, logistic utility and equipment, tunnel characteristics, objectives
and geological conditions. Although in each of the main models same as CSM, NTNU and QTBM, the
specific parameters used to estimate the utilization coefficient, the effect of management factor and
interactions and overlapping factors not considered. On the other hand, many parameters have a severe
dependence on each other and may simultaneously affect the performance of the TBM. Therefore, the
interaction matrix can be used to evaluate the interaction of parameters on each other and on TBM
performance. The effect of 18 parameters on the utilization coefficient was evaluated by the matrix method
in Karaj water conveyance tunnel. The interactions of these parameters show that the lack of utility services
and shift change have the most significant impact on TBM performance. By recording the actual delays in
each parts of tunnel, the downtime index (DTI) is obtained; this index has a direct relationship with tunnel
boring time and is inversely related to TBM performance


Main Subjects

Article Title [Persian]


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