Effects of the hydraulic capacity of advance drainage boreholes on tunnel face stability

Zingg, Sara; Anagnostou, Georg

doi:10.1016/j.tust.2017.10.008

Cited by 13 publications

(3 citation statements)

References 10 publications

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“…Inclined drilling is not uncommon in the mining industry and in geoengineering and is often used for exploration and dewatering (e.g. Müller et al 2009;Zingg and Anagnostou 2018). Slant wells are sometimes used as intakes for desalination plants (Williams 2013(Williams , 2015 and to reach contaminant plumes under built-up industrial sites (Furukawa et al 2017).…”

Section: Larger Construction Sitementioning

confidence: 99%

Review: Horizontal, directionally drilled and radial collector wells

et al. 2022

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Horizontal wells play an often overlooked role in hydrogeology and aquifer remediation but can be an interesting option for many applications. This study reviews the constructional and hydraulic aspects that distinguish them from vertical wells. Flow patterns towards them are much more complicated than those for vertical wells, which makes their mathematical treatment more demanding. However, at some distance, the drawdown fields of both well types become practically identical, allowing simplified models to be used. Due to lower drawdowns, the yield of a horizontal well is usually higher than that of a vertical well, especially in thin aquifers of lower permeability, where they can replace several of the latter. The lower drawdown, which results in lower energy demand and slower ageing, and the centralized construction of horizontal wells can lead to lower operational costs, which can make them an economically feasible option.

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Section: Larger Construction Sitementioning

confidence: 99%

Review: Horizontal, directionally drilled and radial collector wells

et al. 2022

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“…For theoretical methods, in consideration of the effective stress and the seepage force, the limit support pressure, which is calculated by the limit equilibrium method, is required to stabilize the stability of the tunnel face (Wang et al, 2019;Wu et al, 2021). Simultaneously, the limit equilibrium method was also used to analyze how both the hydraulic heterogeneity and the advance drainage influence the stability of tunnel face (Li et al, 2020;Su, 2019;Zingg and Anagnostou, 2018).…”

Section: Introductionmentioning

confidence: 99%

Failure mechanism investigation of tunnel face subjected to high hydraulic pressure

Zhang,

Wang,

Zeng

et al. 2024

Preprint

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A huge amount of underwater ahead of tunnel face surges abruptly into the excavated cavern with respect to the high hydraulic pressure after the karst geology is penetrated. In order to avoid the construction accidents in tunneling, it is particularly important to investigate the failure mechanism of the tunnel face subjected to the high hydraulic pressure. To establish a water-surged model centered on the disturbed tunnel face, both the elastic-plastic stress and the high hydraulic pressure are considered simultaneously. Afterwards, a simplified analytical solution based on the Hoek-brown criterion is developed. An illustrative example is used to demonstrate the performance of the proposed solution. The simplified analytical solution derived in this study is validated by the numerical simulations. In addition, a series of numerical simulation are performed to investigate influencing factors of the disturbance zone range ahead of tunnel face. The results indicate the simplified analytical solution of the plastic zone ahead of tunnel face under the different supports can be applied for the stability of hydraulic tunnels, preliminarily estimate the failure zone ahead of tunnel face. The range of plastic zone ahead of tunnel face is greatly influenced by the tunneling radius, surrounding rock grade and the hydraulic pressure.

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“…Continuous conduits, as one type of primary hydraulic channel, significantly control the permeability of rock masses (Jia et al 2013). Due to the existence of continuous conduits, immense challenges are sometimes posed in many engineering projects, for example, tunnel excavation (Zingg and Anagnostou 2018;Chen et al 2020), petroleum and gas extraction (Wu et al 2011;Lyu et al 2017), and groundwater pollution control (Magal et al 2013;Reh et al 2013). Compared with other rock formations, continuous conduits are more common in carbonate rock formations (Jia et al 2013;Lyu et al 2017).…”

Section: Introductionmentioning

confidence: 99%

A Closed‐Form Solution for Free‐ and Seepage‐Flow Field in Axisymmetric Infilled Conduit

Zhang

Ye³

et al. 2021

Groundwater

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Numerous continuous conduits exist in rock masses. These conduits affect the specific discharge distribution of the bulk rock mass. In this study, a modified theoretical model is presented to explore the specific discharge distribution in bedrock with an axisymmetric infilled conduit. The movement of fluid in the free region abides by the Navier-Stokes equation, and the seepage flow in the filling and rock regions complies with the Brinkman-extended Darcy equation. The analytical solution for the specific discharge distribution is derived by requiring flow continuity at the domain interface. This solution can be reduced to Darcy's law and Poiseuille's law. Sensitivity analysis shows that both the relative aperture of the free region and the permeability of the filling or rock regions positively influence the specific discharge. The specific discharge distribution curves seem to have an intersection for different porosity values. Moreover, the width of the transition layer where the porous media flow differs from traditional Darcy's flow is positively correlated with the permeability. However, the width is not directly correlated with the relative aperture and the porosity.

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Effects of the hydraulic capacity of advance drainage boreholes on tunnel face stability

Cited by 13 publications

References 10 publications

Review: Horizontal, directionally drilled and radial collector wells

Review: Horizontal, directionally drilled and radial collector wells

Failure mechanism investigation of tunnel face subjected to high hydraulic pressure

A Closed‐Form Solution for Free‐ and Seepage‐Flow Field in Axisymmetric Infilled Conduit

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