Analysis of factors affecting the deformation of soft rock tunnels by data envelopment analysis and a risk assessment model

Bai, Chenghao; Xue, Yiguo; Qiu, Daohong; Su, Maoxin; Ma, Xiaoyan; Liu, Haiting

doi:10.1016/j.tust.2021.104111

Cited by 20 publications

(3 citation statements)

References 47 publications

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“…There is limited research on handling and identifying challenges and barriers that influence the execution of tunnels. For example, twelve main influencing factors involving subjective and objective factors were identified as well as four actual indices to assess the deformation risk of tunneling in soft rock [26]. An assessment for delay risk was conducted to predict delays in tunneling boring machine (TBM) projects and to assign the causing critical risk factors [20].…”

Section: Identifying Risk Factors Affecting Machinery Tunnel Executionmentioning

confidence: 99%

Developing a Model for Analyzing Risks Affecting Machinery Tunnel Execution

Eid

Issa

2023

Buildings

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Tunneling projects face several risks during the execution stage that affect the execution objectives (cost, time, quality, and safety). This study aimed to define the main execution activities of machinery tunnels with the associated risk factors and to develop a model for evaluating and analyzing the effects of the risk factors on the execution stage. The recognized activities of executing tunnels included the following: (A01) thrust and reception shaft installation; (A02) machine setup and break-in; (A03) machine progression and lining placing; and (A04) machine break-out and removal. Additionally, thirty-two risk factors associated with these activities were identified. Risk factor probability of occurrence and impacts on cost, time, quality, and safety were determined. Due to this risky and uncertain environment, the fuzzy logic method was applied for developing a model to analyze the effects of the risks on the tunneling process. The model was applied and verified using data collected in Egypt. Many correlations were determined among risk factors that affected tunneling execution objectives, resulting in close relationships with each other. The results emphasized many significant risk factors, such as “conflict between technical geological report and the ground nature”, and “shaft wall damage during break-out”. A03, which is related to machine progression and lining placing, was declared the riskiest activity group during tunneling execution. Further, safety was rated as the objective most affected by risks. The risk model presented in this study can be modified and applied to other cases, while the results and key risks can support the decision-makers who deal with tunneling construction.

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Section: Identifying Risk Factors Affecting Machinery Tunnel Executionmentioning

confidence: 99%

Developing a Model for Analyzing Risks Affecting Machinery Tunnel Execution

Eid

Issa

2023

Buildings

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“…The same approach is presented by Wijesooriya et al [20], who use this procedure to describe the behavior of an industrial chimney under the influence of wind. Bai et al [21] use predictive models (Data Envelopment Analysis (DEA)) to describe 12 factors affecting the deformation of a tunnel. In [1], FEM is used to assess the impact on the deflection of building walls of increasing loads on the structure in mining conditions.…”

Section: Introductionmentioning

confidence: 99%

Selection of an Algorithm for Assessing the Verticality of Complex Slender Objects Using Semi-Automatic Point Cloud Analysis

Matwij,

Lipecki,

Jaśkowski

2024

Remote Sensing

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Remote technologies, including laser scanning, are frequently employed to acquire data describing the geometric condition of engineering objects. The automation of point cloud processing becomes essential for promptly and reliably monitoring changes in their current shape. The article introduces a methodology for generating point clouds, focusing on detecting the shape of the object’s cross profiles and subsequently determining its inclination through simulations and real data recorded using terrestrial laser scanning technology. The simulations enabled the identification of variations in the characteristics of changes in the course of the axis of a slender structure, depending on the adopted calculation method. Point clouds derived from measurements of complex engineering objects facilitated the validation of the assumptions of the proposed methodology. The suggested solution enables the semi-automatic extraction of data from point clouds and the assessment of the geometric state of engineering object axes based on multi-temporal point clouds.

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“…Case studies on the deformation of serpentinite tunnels are not hit in the Web of Science database, although severe deformation has been experienced at soft rock tunnels worldwide, and many papers have been published (ex. [1], [2]. The lack of publication may indicate that tunnel excavation in serpentinite is difficult and tends to be avoided outside Japan and empirically managed in Japan.…”

Section: Introductionmentioning

confidence: 99%

A case study on severe damage at a tunnel in serpentinite rock mass

et al. 2021

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Face squeezing, floor heave, and buckling of invert were found after a 10-day holiday in 2014 around the serpentinite face of a tunnel in Hokkaido, Japan. The damage continued for over 2 months, extending 400 m toward the entrance causing a massive roof fall. The tunnel was excavated again with a circular section and extra-thick shotcrete, and the face had crossed the damaged part 6 years after the damage occurred. Uniaxial and triaxial compression tests were carried out to obtain the mechanical properties of the serpentinite to clarify the severe damage mechanism at the tunnel. The main experimental findings are as follows. The uniaxial compressive strength of the serpentinite samples was very low, and the ratio of the strength to the estimated overburden pressure was extremely low. The parameter n indicated that the time-dependent deformation of the serpentinite was not large but the same as ordinary rocks. All specimens showed strain-hardening in the triaxial compression test, and the friction angle was very low by the brucite content. Only primary creep was observed in the multistage triaxial creep test. The pressure on the shotcrete from rock mass for the damaged tunnel was enough to cause creep deformation and failure of shotcrete. From the above findings, designing the concrete lining that can support the earth and water pressure is recommended for tunnel excavation in such a weak serpentinite rock mass, particularly with a very low friction angle by brucite. Highlights Face squeezing, floor heave, and buckling of invert were found after a 10-day holiday around the serpentinite face in Hokkaido, Japan. The time-dependent deformation of the serpentinite was not large but the same as ordinary rocks. All specimens showed strain-hardening in the triaxial compression test, and the friction angle was very low by the brucite content. Only primary creep was observed in the multistage triaxial creep test. The severe damage to the tunnel was not a brittle creep failure of the serpentinite rock mass itself but the shotcrete lining.

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Analysis of factors affecting the deformation of soft rock tunnels by data envelopment analysis and a risk assessment model

Cited by 20 publications

References 47 publications

Developing a Model for Analyzing Risks Affecting Machinery Tunnel Execution

Developing a Model for Analyzing Risks Affecting Machinery Tunnel Execution

Selection of an Algorithm for Assessing the Verticality of Complex Slender Objects Using Semi-Automatic Point Cloud Analysis

A case study on severe damage at a tunnel in serpentinite rock mass

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