Prediction of water inflow to mechanized tunnels during tunnel-boring-machine advance using numerical simulation

Golian, Mohsen; Teshnizi, Ebrahim Sharifi; Nakhaei, Mohammad

doi:10.1007/s10040-018-1835-x

Cited by 44 publications

(12 citation statements)

References 38 publications

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“…Data sources for groundwater flow modelling contain climate, geomorphology, geophysics, geology, land‐use, hydrology, and hydrogeology information. ArcGIS software was applied for data storage, repossession, and assessment for groundwater and transforming the data to suitable formats for numerical simulation (Golian, Sharifi Teshnizi, & Nakhaei, ).…”

Section: Methodsmentioning

confidence: 99%

“…After the boundary and initial conditions and hydraulic properties of the aquifer material for the grid in MODFLOW are defined, the model should be checked with model checker to analyse the input data currently defined for a model simulation and report any obvious errors or potential problems. Finally, after the errors are found and corrected, the numerical model can be run in the proper way (Golian et al, ).…”

Section: Methodsmentioning

confidence: 99%

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Effect of management strategies on reducing negative impacts of climate change on water resources of the Isfahan–Borkhar aquifer using MODFLOW

Ostad‐Ali‐Askari

Kharazi

Shayannejad

et al. 2019

River Research & Apps

134

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Recently, many studies have investigated the effect of climate change on groundwater resources in semiarid and arid areas and have shown adverse effects on groundwater recharge and water level. However, only a few studies have shown suitable strategies for reducing these adverse effects. In this study, climate conditions were predicted for the future period of 2020-2044, under the emission scenarios of RCP2.6, RCP4.5, and RCP8.5, for Isfahan-Borkhar aquifer, Isfahan, Iran, using MODFLOW-2000 (MODFLOW is United States Geological Survey product). Results showed that the average groundwater level of the aquifer would decrease to 13, 15, and 16 m in 2012 to 2044 approximately under RCP2.6, RCP4.5, and RCP8.5 scenarios, respectively. Then, three groundwater sustainability management scenarios were defined that included 10%, 30%, and 50% reduction in groundwater extraction. These strategies simulated the reduced negative effects of climate change on the aquifer.The results showed that decreases in water withdrawal rates of 10%, 30%, and 50% under RCP8.5 scenario (critical scenario) could decrease the mean groundwater level by 14, 11, and 7 m, respectively. The main result of the study showed that 50% reduction in groundwater withdrawal may increase the groundwater levels significantly in order to restore the aquifer sustainability in the study area. In this study, with assuming that the current harvest of wells in the future period is constant, so the results of studies showed that for the aquifer's sustainability management, the water abstraction from the aquifer should reduce up to 50% of the existing wells.Changing the irrigation method from surface to subdroplet irrigation plays an important role in reducing the withdrawal from the aquifer. The results of a study in Iran have shown that the change in the irrigation method from surface to subdroplet irrigation causes a 40% reduction in water use for agriculture.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effect of management strategies on reducing negative impacts of climate change on water resources of the Isfahan–Borkhar aquifer using MODFLOW

Ostad‐Ali‐Askari

Kharazi

Shayannejad

et al. 2019

River Research & Apps

134

View full text Add to dashboard Cite

show abstract

“…Since most groundwater inflows are recorded in fault zones (Attanayake and Waterman, 2006;Perrochet and Dematteis, 2007;Yang et al, 2009;UNAL, 2010;Moon and Fernandez, 2010;Zarei et al, 2011;Loew et al, 2015), fractures have been represented within heterogeneous media as more permeable areas with EPM approaches (Perrochet and Dematteis, 2007;Maréchal et al, 2014;Preisig, 2013). This conceptualization has been extended to numerical modeling in order to predict groundwater inflow into tunnels (Mar´echal et al, 1999;Hu and Chen, 2008;Yang et al, 2009;Butscher et al, 2011;Chiu and Chia, 2012;Butscher, 2012;Xia et al, 2018;Golian et al, 2018;Nikvar Hassani et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Embedded Discrete Fracture Networks to Analyze Groundwater Inflows during Tunnel Drilling

et al. 2021

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Tunnels commonly go through fracture zones that used to be analyzed as an equivalent porous medium with homogeneous permeability. However, it is a rough simplification that overlooks the connection triggered by underground works in fractured massifs. This study introduces the use of synthetic discrete fracture networks (DFN) to analyze groundwater inflows through tunnel excavation in a fractured zone considering the daily advance of the drilling front. First, a hypothetical case with six different settings varying the fracture density, the fracture length, and the aperture distribution is analyzed. Each setting has about 100 iterations. DFN hydraulic properties were estimated and compared with previous DFN studies, displaying the same behavior even though the magnitude of the estimated parameters differs. As an application example, structural measurements of the Alaska fault zone in the La Linea massif (Colombia) are used to obtain the statistical parameters of the fracture length and aperture distributions to generate the DFN. Five settings varying the fracture density are built, obtaining measured and simulated groundwater inflows of the same order of magnitude. These results highlight the potential of the synthetic DFN to analyze tunnels’ effects on groundwater flow.

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“…Among these cases, the weathered granite is the most common formation, such as in the Dongkeling tunnel, Cenxi tunnel, and Liangshan tunnel (Zhou 2015;Liu et al 2018a, b;Zhang et al 2019). These unwanted disasters often caused the significant construction stoppages, serious casualties, and tremendous economic losses, presenting a huge challenge for safe construction (Xu et al 2018(Xu et al , 2019Yuan et al 2019;Golian et al 2018Golian et al , 2021b. Therefore, it is necessary to investigate the mechanism of water and mud inrush from completely weathered granite and to find the effective methods to control this situation.…”

Section: Introductionmentioning

confidence: 99%

Prediction of water–mud inrush hazard from weathered granite tunnel by an improved seepage erosion model

Liu

et al. 2021

Bull Eng Geol Environ

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During tunnel construction, water and mud inrush disasters from completely weathered granite usually lead to the serious casualties and economic losses. Predicting these disasters are vital to the safety construction. Considering the critical erosion condition and flow pattern variation at the three stages (Darcy, rapid, and stable flow stages), a seepage erosion model is developed to perform the coupling analysis of water and mud inrush evolution. The model is shown to have favorable accuracy in real-time predicting the erosion region, ground settlement region, and the main hydraulic parameters (i.e., permeability, water inflow, and mud inflow) by comparison with the laboratory tests and field investigations. Then, effects of the model parameters (i.e., particle diameter, erosion coefficient, and ground permeability) on the water and mud inrush are investigated. Results show that (1) with the decreasing particle diameter, the permeability and the water and mud inflow increase gradually. (2) The erosion coefficient mainly affects the evolution rate and time of the water and mud inrush disaster.(3) The water and mud inrush can be controlled when the ground permeability decreased to the 0.2 time of the initial value. The research findings and the proposed model can provide the reference for the water inrush prevention in a similar project.

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Prediction of water inflow to mechanized tunnels during tunnel-boring-machine advance using numerical simulation

Cited by 44 publications

References 38 publications

Effect of management strategies on reducing negative impacts of climate change on water resources of the Isfahan–Borkhar aquifer using MODFLOW

Effect of management strategies on reducing negative impacts of climate change on water resources of the Isfahan–Borkhar aquifer using MODFLOW

Embedded Discrete Fracture Networks to Analyze Groundwater Inflows during Tunnel Drilling

Prediction of water–mud inrush hazard from weathered granite tunnel by an improved seepage erosion model

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