An investigation into efficient drainage layouts for the stabilization of tunnel faces in homogeneous ground

Zingg, Sara; Anagnostou, Georg

doi:10.1016/j.tust.2016.04.004

Cited by 30 publications

(7 citation statements)

References 12 publications

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“…Advance drainage decreases both the pore pressures and their gradients ahead of the tunnel face, thus improving its stability [9]. The stabilizing effect of drainage is significant, even under the practical limita tions that are imposed by the TBM equipment with re spect to the spacing and number of boreholes [10]; in the present case, boreholes could only be drilled relatively easily in the upper part of the tunnel face ( Figure 2c). In the case of particularly poor ground, advance drainageeither alone ( Figure 5, BC) or in combination with grout ing ( Figure 5, ABC) -allows reductions of operating pres sure, thus widening the feasibility range of open mode operation and reducing the technical risks associated with TBM operation at very high support pressures over long parts of the tunnel.…”

Section: Assessment Of Face Stabilitymentioning

confidence: 78%

“…5. Slurry or compressed air pressure required for longterm stability as a function of the cohesion with or without advance drainage, calculated according to [10] the latter (at a distance of about 2 m from the working face) and, later, also in the middle and in the rear part of the shield. When the ground establishes contact with the shield by closing the gap, pressure develops upon the shield (Figure 8, upper diagram), which increases shield skin friction and necessitates a higher thrust force.…”

Section: Maximum Slurry Pressures and Maximum Air Pressures For Intmentioning

confidence: 99%

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Lake Mead Intake No 3 Tunnel – Design considerations and construction experience

Anagnostou

Schuerch

Perazzelli

2018

Geomechanics and Tunnelling

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This paper presents the pre‐construction evaluation of the ground for the Lake Mead Intake No 3 Tunnel and the experience gained from the project, which had the aim of maintaining water supplies for the Las Vegas greater metropolitan area. The construction of this tunnel using a dual‐mode slurry shield represents a major engineering achievement, which pushed back the boundaries of closed shield tunnelling: Overcoming an extended fault zone under high hydrostatic pressure in the metamorphic rocks and mucking‐out difficulties associated with high rates of water inflow in the sedimentary rocks necessitated closed‐mode operation over about 2 km at unprecedentedly high face pressures of up to 14 bar.

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Section: Assessment Of Face Stabilitymentioning

confidence: 78%

Section: Maximum Slurry Pressures and Maximum Air Pressures For Intmentioning

confidence: 99%

Lake Mead Intake No 3 Tunnel – Design considerations and construction experience

Anagnostou

Schuerch

Perazzelli

2018

Geomechanics and Tunnelling

Self Cite

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“…Sara Zingg. et al [7,8] studied the effectiveness of various advanced drainage schemes (including drainage through an external parallel adit) on the stabilization of tunnel faces. Several other scholars have also focused on advanced drainage's effect on tunnel face stability [9,10].…”

Section: Introductionmentioning

confidence: 99%

A Semi-Analytical Model and Parameter Analysis of a Collaborative Drainage Scheme for a Deeply Buried Tunnel and Parallel Adit in Water-Rich Ground

Luo

Xiang

2022

Applied Sciences

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For a railway or highway tunnel under high water pressure during operation, various factors such as the design of the drainage system, material aging, and pipeline blockage must be considered for the tunnels to work with the parallel adit to drain and control the external water pressure on the tunnel lining. A simplified steady-state seepage model in a semi-infinite multi-connected domain for the tunnel and parallel adit was established and was solved iteratively using the complex variable method and the Schwartz alternating method. After verifying the numerical simulation, parametric analysis, orthogonal tests, and multivariate nonlinear regression were also carried out. Results show that the simplified theoretical model and its semi-analytical algorithm have a fast convergence speed, and the obtained regression formula is simple, which is suitable for calculation and parameter analysis. A scheme that primarily relies on the parallel adit for drainage would make the external water pressure of the lining facing the parallel adit side less than that of the opposite side. Therefore, to reduce pressure uniformly and meet the requirements of surrounding rock stability, the horizontal net distance between the parallel adit and the tunnel should be no less than the tunnel diameter. Drainage volume of the parallel adit is linearly negatively correlated with tunnel water pressure on the lining and has the most significant effect on pressure reduction. The influence of the vertical distance between the parallel adit and the tunnel on water pressure is small.

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“…This interaction is particularly complex and largely affects the contribution of the pipe roof to the reduction of the soil settlement as well as to the improvement of the excavation stability. Studies using limit equilibrium or limit analysis methods were used for the analysis of the tunnel face stability [2][3][4]. Experimental studies were also conducted to explore excavation stabilities [5].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Behavior of Rectangular Excavations Supported by a Pipe Roof

2019

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This paper presents an experimental investigation of the role of pipe-roofs in the improvement of the stability of rectangular excavations constructed using pipe-roof technology. This technology is suitable for the construction of underground passages in crowded areas subjected to high requirements concerning soil settlement and stability during excavation construction. The design of a rectangular pipe-roof excavation required an understanding of the interaction between the soil, the pipe-roof and the excavation. This interaction is complex and plays an important role in the features of the pipe roof excavation. This paper presents a series of 1g physical experimental tests conducted in dry sand soil with an advanced monitoring system, which allows tracking of the soil settlement, the pipe deformation and the soil pressure. Analysis of these tests shows the effective role of the pipe-roof in reducing both the soil settlement and the soil pressure on the excavation. It also shows the influence of pipes on the deformation mechanism of the soil and its evolution from low deformation to the instability phase.

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An investigation into efficient drainage layouts for the stabilization of tunnel faces in homogeneous ground

Cited by 30 publications

References 12 publications

Lake Mead Intake No 3 Tunnel – Design considerations and construction experience

Lake Mead Intake No 3 Tunnel – Design considerations and construction experience

A Semi-Analytical Model and Parameter Analysis of a Collaborative Drainage Scheme for a Deeply Buried Tunnel and Parallel Adit in Water-Rich Ground

Experimental Study of the Behavior of Rectangular Excavations Supported by a Pipe Roof

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