Multiphase Risk-Management Method and Its Application in Tunnel Engineering

Bai, Yun; Dai, Zhijun; Zhu, Weiyu

doi:10.1061/(asce)nh.1527-6996.0000124

Cited by 22 publications

(11 citation statements)

References 8 publications

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“…While applying observational modelling, the lesson learnt from the earlier stage of the same project is used to reduce the size of the initial risk. Progressive application of such dynamic risk management is termed as Multiphase Risk Management Method [192] [193]. Furthermore, the cushion layer compressibility and the interaction effects among each pile while the soil moves around the piles would require 3D finite element analysis.…”

Section: Risk Management Processmentioning

confidence: 99%

Deep Foundation Pit Excavations Adjacent to Disconnected Piled Rafts: A Review on Risk Control Practice

Uge¹,

Guo²

2020

OJCE

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Foundation pit excavation engineering is an old subject full of decision making. Yet, it still deserves further research due to the associated high failure cost and the complexity of the geological conditions and/or the surrounding existing infrastructure around it. This article overviews the risk control practice of foundation pit excavation projects in close proximity to existing disconnected piled raft. More focus is given to geotechnical aspects. The review begins with achievements to ensure excavation performance requirements, and follows to discuss the complex soil structure interaction involved among the fundamental components: the retaining wall, mat, piles, cushion, and the soil. After bringing consensus points to practicing engineers and decision makers, it then suggests possible future research directions.

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Section: Risk Management Processmentioning

confidence: 99%

Deep Foundation Pit Excavations Adjacent to Disconnected Piled Rafts: A Review on Risk Control Practice

Uge¹,

Guo²

2020

OJCE

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“…Liu et al [16] studied the probability of risk occurrence, potential consequence, and level of rockburst risk in the Jinping II hydropower station. To update the variation of new knowledge and early warnings, Bai et al [17], Shalev et al [18], Paltrinieri et al [19], and Khan et al [20] explored dynamic risk management and updated risk evaluation to lessen uncertainty, since any process is subject to constant evolution due to natural or human causes [20]. These studies provided valuable methods for analysis and assessment of risk of delayed payment in LHPC.…”

Section: Model Namementioning

confidence: 99%

Risk Propagation of Delayed Payment in Stakeholder Network of Large Hydropower Project Construction considering Risk Resistance and Mitigation

Chen

Liu

et al. 2018

Mathematical Problems in Engineering

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Large hydropower project involves numerous stakeholders in the construction phase. The risk of delayed payment may escalate into an event of catastrophic economic loss through complex stakeholders’ relationships. This paper builds a complex stakeholder network by collecting all contract prices in large hydropower project construction (LHPC) and proposes a novel mathematical model based on Cellular Automata Susceptible-Infected-Susceptible (CA-SIS) framework to analyze the risk propagation of delayed payment (RPDP). In the model, to approximate actual loss diffusion, risk-resisting and risk-mitigating abilities of stakeholders are combined, and relevance between risk mitigation and time is taken into account. The rationality and feasibility of the novel model are illustrated through its application to an actual LHPC. The simulation results include the following: RPDP presents three phases: risk first slightly propagates, risk then exponentially breaks out, and at last propagation consequence will reach a stable state related to stakeholders’ risk-resisting ability closely; in respect of stakeholders’ risk-mitigating ability and property of the network, RPDP range decreases with the increase of number of partners and homogeneity of contract price distribution; in respect of stakeholders’ risk-resisting ability, RPDP range decreases with the decrease of number of partners. This research can serve as a powerful complement to analyze and control the delayed payment in LHPC.

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“…Compared with other soil, the loess has special structural and water sensitivity: (1) the joint fissure is developed, the mesoscopic structure is porous, and the difference of dry and wet strength is remarkable; (2) most of them have strong collapsibility, softening, and deforming in water [2][3][4][5][6]. Therefore, the change of water environment is very easy to induce engineering geological hazard, and the effect of humankind engineering activity can easily increase the disaster of loess [7][8][9][10][11][12][13]. In the past 10 years, Xi'an city, as a main developing city in Western China, has taken the leadership in large-scale construction of subway in the loess strata [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…The soil model followed the Mohr-Coulomb failure criterion [69], and the pore water pressure obeyed Darcy's law in order to appropriately Figure 12: Surrounding rock pressure-time curves of Y1, Y2, and Y3. 8 Geofluids simulate the seepage of saturated loess. In the modeling, the lower boundary of the model restricted displacement in the X and Y directions, in which two sides of the model restricted displacement in the X direction.…”

Section: Modeling Introductionmentioning

confidence: 99%

Structural Response of the Metro Tunnel under Local Dynamic Water Environment in Loess Strata

et al. 2019

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The reasons, prevention, and control of loess disaster are of great concern in practice. In recent years, Xi’an city, China, has taken the leadership in large-scale construction of subway lines in the loess strata. To study the structural response of the tunnel in loess region under local hydrodynamic environment, an experimental testing in 1g as well as a numerical simulation were performed, in which the achieved results were verified and were found to be in good agreement. Furthermore, the results showed that when the water outlet point is above the lining, the overall stress of the lining is “peanut shell,” as the water pressure of the outlet point decreases, the tensile stress of the top and bottom of the lining increases, while the compressive stress on both sides decreases; the channel form of the flow to the lining changes with the variation of the position of the water outlet point. It is worth mentioning that in the process of water gushing, the closer to the water source, the greater surface subsidence is, and there is a positive correlation between water pressure and surface subsidence. This study is of significant benchmark for the construction, maintenance, and prevention of tunnel in loess strata under the influence of water environment.

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Multiphase Risk-Management Method and Its Application in Tunnel Engineering

Cited by 22 publications

References 8 publications

Deep Foundation Pit Excavations Adjacent to Disconnected Piled Rafts: A Review on Risk Control Practice

Deep Foundation Pit Excavations Adjacent to Disconnected Piled Rafts: A Review on Risk Control Practice

Risk Propagation of Delayed Payment in Stakeholder Network of Large Hydropower Project Construction considering Risk Resistance and Mitigation

Structural Response of the Metro Tunnel under Local Dynamic Water Environment in Loess Strata

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