Abstract
The constructions of urban infrastructure are an important sector that provides remarkable ingredients for the economic development of modern cities. However, a large number of transportation infrastructure construction projects are delayed; therefore, those projects always exceed their original time and cost estimates. So construction delay has been considered as a recurring problem in the construction projects of urban infrastructure, and it adversely affects the time, cost, safety, and quality of construction. This paper is committed to investigating the time performance of subway tunnel constructions in China to identify the causes of delay based on the questionnaire surveys of 87 tunnel consultants and 91 contractors, and a total of 49 delay causes of tunnel construction are identified one by one in this study. It can be concluded from this study that the six most severe delay causes are national policy for subway tunnel construction, complicated geological conditions, payment delays by owners, award projects to the lowest bid price, shortage of advanced large equipment, and low productivity of laborers. There is a relatively reliable agreement between the tunnel consultants and contractors of 76.3% on the ranking of different delay causes.
Highlights
(ii) Continued increase in material and labor prices (iii) Dependency on government investments to implement construction projects of infrastructure (iv) Complicated geological conditions in different areas
Yang et al identified the delay causes in various stages of BOTprojects by the opinions of BOT participants, and the study results revealed that the “improper contract planning,” “debt problem,” and “uncertainty on political issues” were the most significant delay causes [18]
E studied project participants mainly involve contractors and consultants, the contractors are holding the valid registrations in tunnel specialization within China from the Chinese Contractors Association. e studied project participants do not involve owners because the subway tunnel construction projects are public infrastructure projects which are always funded by the local governments, it means that there is only one owner for each project and so the view of the owner is not collected through a questionnaire survey. e studied contractors and consultants are selected by random sampling from an available list. e detailed communication information of studied contractors and consultants are obtained from the database of the Chinese Contractors society
Summary
(ii) Continued increase in material and labor prices (iii) Dependency on government investments to implement construction projects of infrastructure (iv) Complicated geological conditions in different areas. In China, the general investigations have indicated that construction project delay is a common phenomenon, but there are no former researches which have carefully investigated the causes of project delay in subway tunnel construction. Is paper aims to investigate the most severe delay causes of subway tunnel projects in China. Identifying causes is always the basic work when catching a problem, and corrections can be done [8], so it is hoped that the studies of this paper may guide further works to improve the performance of the projects especially in the subway tunnel construction
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