Assessing maintenance strategies for cutting tool replacements in mechanized tunneling using process simulation

Conrads, Alena; Scheffer, Markus; Mattern, Hannah; König, Markus; Thewes, Markus

doi:10.1057/s41273-016-0046-5

Cited by 16 publications

(7 citation statements)

References 13 publications

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“…Notably, two studies in the existing literature have applied SD, ABM, and DES simultaneously (Conrads et al, 2017;Goh et al, 2016; see Table 1). Conrads et al (2017) implemented an integrated DES, ABM, and SD simulation framework to study maintenance strategies for cutting tool replacements in mechanized tunneling.…”

Section: Des and Abm And Sdmentioning

confidence: 99%

Integration of discrete event simulation with other modeling techniques to simulate construction engineering and management: an overview

Araya

2022

rdlc

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Although Discrete Event Simulation (DES) has been the preferred simulation technique in construction operation studies, it suffers from limitations, such as narrowed focus at the operational level. To minimize the effect of DES limitations, researchers have proposed the integration of DES with other simulation techniques, such as agent-based modeling (ABM), system dynamics (SD), and virtual environments (VE). However, limited studies have discussed whether this integration process minimizes DES’ limitations and to what extent. This study summarizes 99 journal manuscripts in the existing literature published between 2010-2020, focusing on integrating DES with ABM, SD, and VE. This study found that the integration of DES with ABM, SD, and VE addressed multiple of DES’ limitations, namely, the lack of human behaviors in process-oriented modeling, the limited strategic perspective, and challenges related to the verification and validation of DES models’ outputs. Ultimately, this study calls for future studies to evaluate the simultaneous integration of DES, ABM, and SD modeling techniques so the complexity of construction projects can be truly accounted for, as comprehensive simulation tools will require the integration of multiple methods to counterbalance their limitations.

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Section: Des and Abm And Sdmentioning

confidence: 99%

Integration of discrete event simulation with other modeling techniques to simulate construction engineering and management: an overview

Araya

2022

rdlc

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“…Although simulation has been studied extensively in tunneling, relatively few studies have used simulation for modeling microtunneling projects (Nido et al , 1999; Luo and Najafi, 2007; Marzouk et al , 2010; Dang, 2013; Dang et al , 2013; Conrads, 2017). Luo and Najafi (2007) analyzed and simulated the factors affecting productivity in an actual microtunneling field study.…”

Section: Literature Reviewmentioning

confidence: 99%

A hybrid simulation approach for microtunneling construction planning

Moharrami

Taghaddos

RazaviAlavi

et al. 2021

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Purpose Construction planning for microtunneling projects is a complex process due to the high level of uncertainties inherent in underground construction and the interdependent nature of decision variables. Simulation is a suitable decision-making tool to account for uncertainties and to model complex dependencies among decision variables. This paper aims to improve microtunneling construction planning by using simulation. Design/methodology/approach This study proposes a hybrid simulation approach that combines discrete event simulation (DES) with continuous simulation (CS) for microtunneling construction planning. In this approach, DES is used to model construction processes at the activity level and CS is used to model the continuous flow of soil material in the system. Findings To demonstrate the capability of the proposed approach in construction planning of microtunneling projects, different construction plan scenarios are compared in a microtunneling case study. The results of the case study show suitability of the hybrid DES-CS approach in simulating microtunneling construction processes and the practicality of the approach for identifying the most efficient construction plan. Originality/value This study proposes a new modeling approach for microtunneling construction processes using hybrid simulation and provides decision support at the construction planning stage of projects.

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“…Tunneling projects often operate in a similar manner to an assembly line [41]. There is a constant stream of materials being moved from the tunnel entrance to the TBM and excavated material from the TBM being conveyed to outside of the tunnel.…”

Section: Overview Of Tunneling Processmentioning

confidence: 99%

Imaging ahead of a tunnel boring machine with DC resistivity: A laboratory and numerical study

Mifkovic

Swidinsky

Mooney

2021

Tunnelling and Underground Space Technology

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Tunnel Boring Machines (TBMs) are powerful tools for tunneling and underground construction, which excavate material and install a segmental concrete tunnel liner for support.However, unknown ground conditions pose a significant risk to tunneling operations and any damage to the machine can be disastrous to a project. As such, there is a need for tools which look ahead of the TBM for potential hazards during tunneling, including water saturated zones, faults, boulders and metal pipes. Geophysical methods offer the capability to image ahead of tunneling in order to prevent damage to the machine or nearby infrastructure, thus improving tunneling operations. In particular, the DC resistivity method is useful because it is sensitive to a large range of conductivity variations in geological and man-made materials.The research presented in my thesis consists of three parts: (1) a laboratory study of a scale model TBM and tunneling environment, (2) a series of forward models studying different survey designs, and (3) the inversion and imaging of synthetic data under different assumptions. I introduce several new survey designs that attach DC resistivity electrodes on a probe or probes, which are then pushed into the earth in front of the machine each time excavation stops. My laboratory data and forward modeling results show that this method reduces interference caused by the metallic TBM body, and increases the distance ahead of the machine at which a target may be detected: depending on the specific survey design, the TBM influence is minimal once the probe is pushed 20% to 55% of the TBM diameter ahead of the machine and targets can be detected up to 60% TBM diameter away. Finally, I invert synthetic data to produce ahead-of-tunneling images using different amounts of prior information (e.g. TBM and host rock resistivity) and perform a time-lapse inversion, which has not been done for DC resistivity on a TBM before. I conclude the inversions with two types of comparisons to the true model and show that including more prior information decreases model error, but does not necessarily improve how well a target can be imaged.

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Assessing maintenance strategies for cutting tool replacements in mechanized tunneling using process simulation

Cited by 16 publications

References 13 publications

Integration of discrete event simulation with other modeling techniques to simulate construction engineering and management: an overview

Integration of discrete event simulation with other modeling techniques to simulate construction engineering and management: an overview

A hybrid simulation approach for microtunneling construction planning

Imaging ahead of a tunnel boring machine with DC resistivity: A laboratory and numerical study

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