Hybrid SWARA-COPRAS method for risk assessment in deep foundation excavation project: an iranian case study

Existing risks in deep foundation excavation projects is a major issue in developing cities. With the rapid in-crease in the number of various deep foundation and excavation projects in big cities of Iran, many accidents related to deep excavation have been reported every year. These accidents affected delay and increased cost of project implemen-tation. Therefore identification and assessment of risks of these accidents is essential. The aim of the research was to develop a framework to overcome limitations of previous approaches to assess of risks in excavation projects. According to the complexity of a problem and the inherent uncertainty, the framework adopted SWARA (Step-wise Weight As-sessment Ratio Analysis) and COPRAS (COmplex PRoportional ASsessment) methods through introducing new criteria for risk assessment. Data was collected through interview, a literature review and a questionnaire survey distributed to excavation project experts. A case study of deep foundation excavation in Shiraz was presented. The results have shown that the risks involving construction safety, unfavourable geological conditions, shortage of managerial experience, in-complete emergency plan and subsidence of ground are the most significant risks excavation projects in Shiraz. The proposed framework and the obtained results can help stakeholders of excavation projects in developing countries better to manage project risks.

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Design of Retaining and Protecting for a Deep Foundation Excavation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.919-921.1416 ◽

2014 ◽

Vol 919-921 ◽

pp. 1416-1420

Author(s):

Hui Wu Jin

Keyword(s):

Classical Method ◽

Design Method ◽

Small Deformation ◽

Structure Design ◽

Steel Pipe ◽

Deep Foundation ◽

Geological Conditions ◽

High Integrity ◽

Deep Foundation Excavation ◽

Design And Construction

Urban development often requires the construction of deep excavations. There are some difficulties during design and construction of foundation excavation, such as large engineering quantity, poor geological conditions, as well as challenges to design and construction of retaining and protecting structure. To solve these difficulties, supporting system of steel circle beam, steel pipe support and stiffened support compounding with steel pipe pile cofferdam is designed. Soil resistance calculating method is used for support structure design in all possible conditions and the result is compared with that using the classical method. With reasonable supporting process and construction measures, monitoring results including displacement of steel pipe piles and greatest axial force can meet the norm requirements. It is proved that the retaining and protecting system designed is safe and reliable. With the benefit of small deformation and high integrity, locking steel pipe piles gave full play to its locking function of water. The design method in the paper is feasible and may offer some references for similar deep foundation excavation.

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Risk Assessment in Deep Excavations and their Effect on Surrounding Structures : A review

10.31224/osf.io/zv9xy ◽

2021 ◽

Author(s):

Syed Uzairuddin

Keyword(s):

Risk Assessment ◽

Large Scale ◽

Prediction Models ◽

Three Dimensional ◽

Ground Movement ◽

Deep Foundation ◽

Deep Excavations ◽

Ground Deformations ◽

Theoretical Approaches ◽

Deep Foundation Excavation

—Construction is crucial to a country's overall economic growth, particularly in developing countries, in the current era of globalization. If construction operations are not carried out strictly according to a local or national building code, they might result in large-scale failures endangering human lives, personnel property, and the economic balance. It is vital to handle the construction process's risk elements. The self weight of soil behind the retaining line is the driving force and shear strength of soil is the resisting force as a result, deep excavations invariably cause lateral and vertical ground deformations. As a result of the produced ground deformations, nearby buildings and utilities become kinetically loaded. Risks associated with ground movement cannot be calculated solely using mathematical predicting models and engineering simulations as it needs to address the uncertainty of soil properties, Geo-materials, ground constitutive nature, building stage modelling, three-dimensional impacts of deep excavations, time-dependent natures of ground deformations, and the critical necessity to include human variables such as craftsmanship into prediction models are all important considerations.This article provides an overview of risk assessment and management technologies and approaches that have been adapted for use in deep excavations. This article presents a review of the most effective methods for evaluating hazards related with deep excavation and current mitigating techniques. Theoretical approaches to enhancing the safety of deep foundation excavation are examined in the context of a hospital building in Khartoum state and a residential district project in southern Jianxi province.

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Experimental and Numerical Investigations on Hydraulic Barrier Bottom Plug for Deep Excavations: A Case Study

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.d8445.0210421 ◽

2021 ◽

Vol 10 (4) ◽

pp. 57-61

Author(s):

An Phung Vinh

Keyword(s):

High Reliability ◽

Soft Soil ◽

Soil Layer ◽

Clayey Sand ◽

Deep Foundation ◽

Foundation Pit ◽

Geological Conditions ◽

Reasonable Proportion ◽

Hydraulic Barriers

In Vietnam, the solution of designing and constructing deep foundation pits with the geology of sandy or clayey sand is very difficult, especially in case soil mix mud. In some deep foundation pits, the unreasonable treatment solution causes the bottom plug of the foundation pit to be pushed up to the foundation pit or not to pump a foundation pit dried. Solving those problems, this article introduces a particular case study, sealing the bottom of the foundation pit for no 14 of Yen Xa drainage works with the Jet grouted bottom plug hydraulic barriers. To treat the soft soil layer, mix organic without breaking the upper soil layers, this solution uses Jet-grouting technology with a mixture of materials including cement, fly ash, blast furnace slag, lime in a reasonable proportion to ensure waterproof and not uplift the massive bottom plug hydraulic barriers when excavating soil in the pit. Results of calculation and acceptance after the foundation pit is completed show that this is a good solution, high reliability and can be applied to seal the bottom of the foundation pit in similar geological conditions.

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Mould Risk Assessment Based on RST-BN Approach

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.601.611 ◽

2012 ◽

Vol 601 ◽

pp. 611-617

Author(s):

Yong Quan Zhou ◽

Xu Tan

Keyword(s):

Risk Assessment ◽

Rough Set ◽

Rough Set Theory ◽

Research Result ◽

Research Work ◽

Attribute Selection ◽

Quantitative Risk Assessment ◽

Project Risks ◽

Core Reduction

Mould industry is crucial to all manufacturing fields, but there has been very little research work of mould project risk assessment in the world so far, it doesn’t match with mould’s important role in all industries. Mould project risks often became issues, made over 8% rework rate after mould delivery and 20% process rework rate in average. This paper summarized the disadvantage of FTA-BN approach to quantitative risk assessment of mould project, which is widely used in other industry fields, and proposed RST-BN approach instead, The attribute selection and fault diagnosis was developed based on the advantage of rough set theory (RST), to deal with the incomplete, vague and ambivalent data by the innovation algorithms of Core reduction and Unred reduction of attributes. The rough set approach enables one to discover the minimal subsets of condition attributes associated with risk events of mould project, to make BN modeling simpler and effective for quantitative risk assessment. Through a case study, our research result shows that the RST-BN is a promising approach for quantitative risk assessment of mould project development for mould-maker to rank risks and make mitigation plan in advance.

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Consideration of Uncertainties and Risks in the Building Process of Multifunctional Harbor Transshipment Complex

International Journal of Reliability Quality and Safety Engineering ◽

10.1142/s0218539316400118 ◽

2016 ◽

Vol 23 (06) ◽

pp. 1640011 ◽

Cited By ~ 19

Author(s):

Klochkov Yury ◽

Gabitova Lera ◽

Klochkova Elena ◽

Vasilieva Irina ◽

Dementiev Sergey

Keyword(s):

Risk Assessment ◽

Project Management ◽

Complex Model ◽

Building Process ◽

The Matrix ◽

Project Risks ◽

Fmea Analysis ◽

Project Realization

The present paper discusses types of management uncertainty exemplified by the case study of a project of building a multifunctional harbor transshipping center. The analysis is based on the ideas and works of I. Fischer. The paper shows that the role of project management actors substantially influences risks and that change of the actor’s role leads to minimization of risks and elimination of uncertainty about project realization time. To analyze project risks the authors develop a complex model of risk assessment based on analysis of probability and impact level of undesired events. Probability of undesired events is presented as a matrix of risk ranks and a tool for analyzing project risks based on the matrix of risk ranks and FMEA analysis is developed.

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An Overview of Risk-Based EEE Counterfeit Part Detection Based on SAE AS6171

10.31399/asm.cp.istfa2018p0051 ◽

2018 ◽

Author(s):

Michael H. Azarian

Keyword(s):

Risk Assessment ◽

Multiple Solutions ◽

Test Equipment ◽

Assessment Methodology ◽

Test Plan ◽

Specific Test ◽

Risk Assessment Methodology

Abstract As counterfeiting techniques and processes grow in sophistication, the methods needed to detect these parts must keep pace. This has the unfortunate effect of raising the costs associated with managing this risk. In order to ensure that the resources devoted to counterfeit detection are commensurate with the potential effects and likelihood of counterfeit part usage in a particular application, a risk based methodology has been adopted for testing of electrical, electronic, and electromechanical (EEE) parts by the SAE AS6171 set of standards. This paper provides an overview of the risk assessment methodology employed within AS6171 to determine the testing that should be utilized to manage the risk associated with the use of a part. A scenario is constructed as a case study to illustrate how multiple solutions exist to address the risk for a particular situation, and the choice of any specific test plan can be made on the basis of practical considerations, such as cost, time, or the availability of particular test equipment.

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