Improving precision in regional scale numerical simulations of groundwater flow into underground openings

Park, Y.-J.; Hwang, Hyoun‐Tae; Suzuki, Satoru; Saegusa, Hiromitsu; Nojiri, Kohei; Tanaka, T.; Bruines, P.; Abumi, Kensho; Morita, Yutaka; Illman, Walter A.

doi:10.1016/j.enggeo.2020.105727

Cited by 14 publications

(7 citation statements)

References 24 publications

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“…Indeed, the exact conditions and properties of said environments are difficult to model. Thereby, as reported by Park et al 92 the discretization provided by numerical methods is habitually rude, then they also exaggerate groundwater inflows into tunnels. Hence, numerical methods are limited to simplified conceptual models including limited data.…”

Section: Considerations On Numerical Methodsmentioning

confidence: 79%

“…It could also help in designing reliable dewatering system facilitating better accessibility and tunnelling operations. 92 In fact, as reported by Xia et al 95 the time-dependent trend of groundwater inflow into tunnel depends on the variation of hydraulic conductivity and the water drawdown. For an illustration, Figure 9 shows the time-dependency of groundwater inflow into tunnels with the variation of water head drawdown, according to Liu et al 88…”

Section: Considerations On Time-dependency Of Groundwater Inflowsmentioning

confidence: 89%

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Evaluation methods for groundwater inflows into rock tunnels: a state-of-the-art review

Frenelus¹,

Peng²,

Zhang³

2021

IJH

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Groundwater inflow into tunnels is always a salient topic in Hydrology, Hydraulic Engineering, Hydrogeology, Rock Engineering and allied sciences. In fact, tunnels particularly built below the groundwater table, often face groundwater inflows during their excavation, and even sometimes after they are put into operation. These inflows, habitually regarded as unpredictable geological hazards, cause instabilities in the surrounding rocks of tunnels, and lead to considerable damages such as injuries, loss of lives, and huge-scaled economic expenses. It is argued that groundwater conditions are of decisive significance for the design and running of tunnels. Therefore, accurate prediction or evaluation of groundwater inflows into tunnels is of paramount importance. Such prediction, although it is still challenging, has been broached by many researchers with diverse methods. However, a state-of-the-art review of these methods has not yet been presented. This paper reviews the assessment methods of groundwater inflows into tunnels built in rocky media. The results mainly include analytical, semi-analytical, empirical, semi-empirical, numerical, machine learning, and other methods used in the field. This was made possible by selecting and analysing relevant scientific articles published by various worldwide Journals. In addition, some recommendations and future trends are pointed out. This paper can provide useful references in understanding groundwater inflows prediction in different points of view and their limits in terms of applicability and accuracy.

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Section: Considerations On Numerical Methodsmentioning

confidence: 79%

Section: Considerations On Time-dependency Of Groundwater Inflowsmentioning

confidence: 89%

Evaluation methods for groundwater inflows into rock tunnels: a state-of-the-art review

Frenelus¹,

Peng²,

Zhang³

2021

IJH

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“…It is important as it has been widely applied in environmental flows, the visualisation of fluid flow, and the generation of initial flow conditions [3]. One of the notable examples of environmental flow is the estimation of groundwater flow, which is critical for tunnelling construction [4], groundwater extraction [5,6], and contamination prediction [7]. A massive number of works on the numerical simulation of groundwater flow have been reported.…”

Section: Introductionmentioning

confidence: 99%

Semi-Analytical Method for Unsymmetrical Doublet Flow Using Sink- and Source-Dominant Formulation

et al. 2022

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Potential flow formed by doublet flow has been well applied in environmental applications and geothermal designs such as reservoir and fuel injectors. Most of the doublet flow is assumed based on the sink and source with equivalent strength and distance from the origin, forming the well-known Rankine oval structure when a far-field flow is superposed. A semi-analytical method is formulated to systematically investigate the unsymmetrical doublet flow with different strengths of sink and source. The general mathematical expression for unsymmetrical doublet flow is derived analytically before the streamline and the potential line can be visualised via a numerical approach. The results revealed that the doublet flows altered the Rankine oval structure to form aerofoil-like geometry. When the far-field flow interferes with the general Doublet configuration, unique flow structures such as convex, concave, and various wing shapes could be generated. The current study provides new insight on producing aerodynamic curves for the design of bio-inspired structures.

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“…As stated by Hwang and Lu (2007), numerical models are often tedious, time‐consuming, and expensive for tunnel engineers in practice. Dewatering of tunnels is another major engineering practice (Park et al 2020) that should be addressed in analytical models of tunnels. Therefore, there is a practical need to develop state‐of‐the‐art accurate analytical models for computing inflow to tunnels in fractured aquifers in a timely fashion.…”

Section: Introductionmentioning

confidence: 99%

On Inflow to a Tunnel in a Fractured Double‐Porosity Aquifer

Sedghi

Zhan

2021

Groundwater

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Inflow to a tunnel is a great public concern and is closely related to groundwater hydrology, geotechnical engineering, and mining engineering, among other disciplines. Rapid computation of inflow to a tunnel provides a timely means for quickly assessing the inflow discharge, thus is critical for safe operation of tunnels. Dewatering of tunnels is another engineering practice that should be planned. In this study, an analytical solution of the inflow to a tunnel in a fractured unconfined aquifer is obtained. The solution takes into account either the spherical or slab-shaped matrix block and the unsteady state interporosity flow. The instantaneous drainage water table and anisotropic hydraulic conductivities of the fractures network are also considered. Both uniform flux and uniform head boundary condition are considered to simulate the constant head boundary condition in the tunnel. The effects of the hydraulic parameters of the fractured aquifer on the inflow variation of the tunnel are explored. The application of the presented solution to obtain the optimum location and discharge of the well to minimize the inflow to a tunnel is illustrated.

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Improving precision in regional scale numerical simulations of groundwater flow into underground openings

Cited by 14 publications

References 24 publications

Evaluation methods for groundwater inflows into rock tunnels: a state-of-the-art review

Evaluation methods for groundwater inflows into rock tunnels: a state-of-the-art review

Semi-Analytical Method for Unsymmetrical Doublet Flow Using Sink- and Source-Dominant Formulation

On Inflow to a Tunnel in a Fractured Double‐Porosity Aquifer

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