Integrating numerical tools in underground construction process

Attar, Ahmed; Boudjakdji, Mohamed Amine; Bhuiyan, Nadia; Grine, Khaled; Kenai, Said; Aoubed, Ali

doi:10.1108/09699980910970851

Cited by 7 publications

(9 citation statements)

References 19 publications

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“…This seems a reasonable argument for most construction projects as was explained before introducing expression (2) and seems to be aligned with empirical results (e.g. [52,53]). However, if the risk increased by a power other than unity, the maximum compression achievable would have been different to 25%.…”

Section: Discussionsupporting

confidence: 85%

“…Project fast-tracking is increasingly being applied in the construction industry, as there is an increased demand for the expedient delivery of construction projects [53]. Unsuccessful coordination will eventually lead to project cost and/or time overruns.…”

Section: Discussionmentioning

confidence: 99%

“…With all of these limitations, it is to be expected that in real project settings, maximum schedule compressions will generally remain between 10% and 20% as some field studies [52,53] seemed to confirm. However, the upside is that with these lower rates of compression, the additional costs due to fast-tracking (∆c) will also be limited (in the case study, they remained at 17%).…”

Section: Discussionmentioning

confidence: 99%

“…Eldin [52], for example, examined four case studies and concluded that applying fasttracking could reduce project schedules by up to 25% at best; and Attar et al [53] found that fast-tracking practices were able to shorten underground construction projects by an average of 18%. Therefore, our model results seem to be in line with these two field studies measuring fast-tracking performance once these construction projects were finished.…”

Section: 1the Boundaries Of Fast-trackingmentioning

confidence: 99%

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Modelling the boundaries of project fast-tracking

Ballesteros‐Pérez

2017

Automation in Construction

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Fast-tracking a project involves carrying out sequential activities in parallel, partially overriding their original order of precedence, to reduce the overall project duration. The current predominant mathematical models of fast-tracking are based on the concepts of activity sensitivity, evolution, dependency and, sometimes, information exchange uncertainty, and aim to determine optimum activity overlaps. However, these models require some subjective inputs from the scheduler and most of them neglect the merge event bias.In this paper, a stochastic model for schedule fast-tracking is proposed. Relevant findings highlight the existence of a pseudo-physical barrier that suggests that the possibility of shortening a schedule by more than a quarter of its original duration is highly unlikely. The explicit non-linear relationship between cost and overlap has also been quantified for the first time. Finally, manual calculations using the new model are compared with results from a Genetic Algorithm through a case study.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: 1the Boundaries Of Fast-trackingmentioning

confidence: 99%

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Modelling the boundaries of project fast-tracking

Ballesteros‐Pérez

2017

Automation in Construction

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“…Kim, Lee, Kim, Koo, Jung, and Seo [15] and Jung, Kim, Lee, Hwang, and Seo [16] proposed a new conceptual construction process involving floating methods for expanding existing buildings and conceptually arranged the process for selecting the most suitable method among various construction methods according to characteristics of each site. Selection processes for appropriate construction techniques can influence both the time and costs of construction, as well as the environment [17].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Economic Impacts of Sustainable Vertical Extension Methods for Existing Underground Spaces

2020

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Without demolishing an entire existing building, it is possible to sustainably expand its underground spaces to enhance the building’s functionality. However, there have been a few relevant studies exploring this option, and they did not consider the financial feasibilities of underground vertical extension methods. Therefore, this paper analyzes the economic impacts of three sustainable vertical extension methods for existing underground spaces. The extension methods were the (1) bottom-up, (2) normal top-down, and (3) top-down with multi-post downward (MPD) methods. In order to analyze and compare the economic impacts of the underground vertical extension methods, 24 illustrative examples were generated in this paper. Construction costs of the three sustainable vertical extension methods for existing underground spaces are calculated and compared. Those are based on the quantity of used materials in the construction phase and dismantled materials in the demolition phase, as well as unit costs of each material. In addition, the structural stabilities of the examples are analyzed using MIDAS Gen 2017. As the results, the top-down method with MPD was the lowest sustainable method for vertically expanding underground spaces compared to other two methods under the same condition. Moreover, the higher the number of underground floors of existing buildings and the greater the number of extended basement floors, the more economically advantageous was the top-down method with MPD. Considering their structural stabilities and economic impacts of the extension methods help practitioners to select appropriate construction techniques and reduce costs, risks, and the amount of generated construction and demolition waste.

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