EPB excavation in transitional mixed face: Line 5—Lilac (São Paulo Metro, Brazil)

Filho, Luís Cesar Esteves Flamínio; Hartwig, Marcos Eduardo; Moreira, César Augusto

doi:10.1007/s10064-022-02694-z

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…The allowable deflection [w] is used as the maximum limit for the deformation of the unsupported roof, which means that the maximum deflection w max of the unsupported roof failure in the excavation face is equal to the allowable deflection [w]. Therefore, the maximum unsupported roof distance of the tailgate 110 is calculated to be 4.08 m. According to the analysis above, it can be concluded that Li Jie's [18] calculation method for determining the maximum unsupported roof distance, the calculation assumed that the permanent support zone behind the unsupported roof area remains stable. However, the calculation does not consider the impact of advancing abutment pressure within the coal wall on the unsupported roof area.…”

Section: Calculation Of the Maximum Unsupportedmentioning

confidence: 99%

“…Chang et al [18], Meng et al [19], and Xie et al [20][21][22][23] have focused on the phenomenon of large-scale collapse of the surrounding rock in the unsupported roof area of the excavation face. They have conducted research on the stress evolution characteristics and deformation failure laws of the surrounding rock in the unsupported roof area of the excavation face using simulation software such as ABAQUS and FLAC 3D .…”

Section: Introductionmentioning

confidence: 99%

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Study of the Roof Deformation Characteristics of Roadway Excavation Face and Unsupported Roof Distance

Zhang,

Gao,

et al. 2023

Advances in Civil Engineering

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In order to address the issue of slow excavation speed caused by various factors affecting the stability of the roof in the excavation face and the unreasonable distance of the unsupported roof, a mechanical model of the roof in the excavation face area is established. This model is based on the superposition method in the material mechanics. The immediate roof deflection curve equation and the maximum unsupported roof distance discriminant formula of the heading head are derived. The allowable deflection is used as the discriminant method of the maximum unsupported roof distance. The calculation method of the key parameters in the formula is obtained and compared with the existing maximum unsupported roof distance calculation formula. Using the single-variable sensitivity analysis method and the bivariate interaction analysis method, we determine the key factors affecting the deformation of the roof in the excavation face and their interaction relationships. The results indicate that among the 10 factors affecting the deformation of the roof in the temporary support area of the excavation face, there are 3 key factors. Under unchanged geological and mechanical conditions, the deformation of the roof primarily depends on the length of the temporary support area and the temporary support load. To provide a practical example, we calculate the maximum unsupported roof distance of 30304 tailgate in the Yanghuopan Coal Mine to be 3.4 m. Numerical simulation and field monitoring results confirm that the deformation of the roof in the excavation face is minimal, and the stability of the rock is good.

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Section: Calculation Of the Maximum Unsupportedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of the Roof Deformation Characteristics of Roadway Excavation Face and Unsupported Roof Distance

Zhang,

Gao,

et al. 2023

Advances in Civil Engineering

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Assessment for shallow and large tunnel construction in weak ground conditions: Application of tunnel boring machines

Karahan,

Gokceoglu

2024

Deep Underground Science and Engineering

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With recent technological advancements, tunnel boring machines (TBM) have developed and exhibited high performance in large diameters and weak ground conditions. Tunnels are crucial structures that significantly influence the timelines of highway and railway projects. Therefore, the construction of tunnels with TBMs becomes a preferred option. In this study, a comparative analysis between TBM and the New Austrian Tunneling Method (NATM) for tunnel construction is performed in the construction of the T1 tunnel with a diameter of 13 m, which is the longest tunnel in the Eşme‐Salihli section of Ankara‐İzmir High‐Speed Railway Project (Türkiye). The selection of TBM type, measures taken in problematic sections, and application issues of TBM are discussed. The impact of correct description of geological and geotechnical conditions on both selection and performance of TBM is presented. An earth pressure balanced type TBM is chosen for the construction of the T1 tunnel. Because of the additional engineering measures taken before excavation in problematic areas, the tunnel was completed with great success within the initially planned timeframe. From this point of view, this study is an important case and may contribute to worldwide tunneling literature.

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Experimental study on the influence mechanism of soil additives on scraper wear during EPB-TBM tunnelling in abrasive sandy ground

Tang,

Zhang,

Liu

et al. 2024

Bull Eng Geol Environ

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EPB excavation in transitional mixed face: Line 5—Lilac (São Paulo Metro, Brazil)

Cited by 4 publications

References 12 publications

Study of the Roof Deformation Characteristics of Roadway Excavation Face and Unsupported Roof Distance

Study of the Roof Deformation Characteristics of Roadway Excavation Face and Unsupported Roof Distance

Assessment for shallow and large tunnel construction in weak ground conditions: Application of tunnel boring machines

Experimental study on the influence mechanism of soil additives on scraper wear during EPB-TBM tunnelling in abrasive sandy ground

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