Optimization of artificial ground freezing in tunneling in the presence of seepage flow

Marwan, Ahmed; Zhou, Mengmeng; AbdElrehim, Mostafa Zaki; Meschke, Günther

doi:10.1016/j.compgeo.2016.01.004

Cited by 99 publications

(36 citation statements)

References 29 publications

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“…It is currently primarily designed to support the plan-saturated ground conditions, the annular gap grouting and face support pressure, and their interactions are considered. Additional features of the multiphase model for soils allow for consideration of compressed air interventions [17] and soil freezing [18]. The model currently allows to choose between elastoplastic Mohr-Coulomb, Drucker-Prager and Clay and Sand (CASM) models for the representation of the constitutive behaviour of cohesive as well as cohesionless soft soils.…”

Section: Bim-to-fem: Integration Of Design and Numerical Analysismentioning

confidence: 99%

Integrated BIM‐to‐FEM approach in mechanised tunnelling

Alsahly

Hegemann²,

König

et al. 2020

Geomechanics and Tunnelling

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In current tunnelling practice, Finite Element (FE) simulations form an integral element in the planning and the design phase of mechanised tunnelling projects. The generation of adequate computational models is often time consuming and requires data from many different sources, in particular, when manually generated using 2D‐CAD drawings. Incorporating Building Information Modelling (BIM) concepts offers opportunities to simplify this process by using geometrical BIM sub‐models as a basis for structural analyses. This paper presents a Tunnel Information Model (TIM) as a BIM specifically tailored to fit the needs of mechanised tunnelling projects and a ”BIM‐to‐FEM“ technology, that automatically extracts relevant information (geology, alignment, lining, material and process parameters) needed for FE simulations from BIM sub‐models and subsequently performs FE analysis of the tunnel drive. The results of the analysis are stored centrally on a data server to which the user has continuous access. A case study from the Wehrhahn‐Metro line project in Düsseldorf, Germany, is presented and discussed to demonstrate the efficiency and the applicability of the proposed BIM‐to‐FEM workflow.

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Section: Bim-to-fem: Integration Of Design and Numerical Analysismentioning

confidence: 99%

Integrated BIM‐to‐FEM approach in mechanised tunnelling

Alsahly

Hegemann²,

König

et al. 2020

Geomechanics and Tunnelling

Self Cite

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“…Freezing technology is a construction technique that sends refrigerant into the stratum to form an impervious structure by freezing the water [1]. Because of its adaptability to complex stratum, good water-sealing ability, no pollution, technical maturity, and reliability, it has been widely used in construction [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…It was concluded that the distance between freezing pipes is the primary factor to influence the frozen soil column overlap; however, the interaction between various factors was not summarized. A coupled thermohydraulic finite model of frozen soil with an optimization algorithm combined with ant colony was proposed by Marwan et al [1]. After verifying the model through experimental data, the optimal placement of frozen pipes was obtained.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Influencing Factors of Characteristic Index of Local Horizontal Frozen Body of Double‐Row Pipe under Seepage

Shan

Liu

et al. 2020

Advances in Materials Science and Engineering

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In order to deeply understand the influence of different factors on the characteristic indicators of the double-row-pipe partial horizontal frozen body in the sand-gravel stratum under the effect of seepage flow, several sets of sand-gravel stratum frozen model tests were carried out based on the similarity theory. The research showed that (1) under the effect of seepage flow, the backwater surface of the horizontal frozen body is in the shape of a quadratic parabolic and the development velocity of the backwater surface is inversely proportional to the square of the freezing time. The influence of seepage velocity on the downstream length and the freezing front development velocity of the backwater surface is stronger than the refrigerant temperature; (2) overlap time of the second row of frozen soil column increases with the increase of the distance between frozen pipes and seepage velocity and decreases with the decrease of the refrigerant temperature. The influence of various factors on the overlap time follows the order as the distance between freezing pipes > seepage velocity > refrigerant temperature. The average development velocity of the upstream surface decreases with the increase of the seepage velocity and the refrigerant temperature and first increases and then decreases with the increase of freezing pipe spacing. The influence of various factors on the average development velocity follows the order as seepage velocity > the distance between freezing pipes > refrigerant temperature. In addition, through the regression analysis, the quantitative relationship between the maximum arrangement spacing of the frozen pipes, the seepage velocity, and the refrigerant temperature was obtained. The research results can provide a basis for large-area partial horizontal freezing construction in Beijing sand-gravel stratum.

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“…With its good water barrier and non-pollution characteristics, the artificial ground freezing (AGF) method is widespread in environmental engineering (e.g., excavation of pollutants) [1,2], mining engineering (e.g., mine shafts construction), and especially in underground engineering (e.g., subsea tunnel and urban subway construction) [3][4][5][6]. The basic principle of this method is to circulate a fluid refrigerant (ca.…”

Section: Introductionmentioning

confidence: 99%

Case Study of Heat Transfer during Artificial Ground Freezing with Groundwater Flow

Liu

Xing

2018

Water

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For the artificial ground freezing (AGF) projects in highly permeable formations, the effect of groundwater flow cannot be neglected. Based on the heat transfer and seepage theory in porous media with the finite element method, a fully coupled numerical model was established to simulate the changes of temperature field and groundwater flow field. Firstly, based on the classic analytical solution for the frozen temperature field, the model’s ability to solve phase change problems has been validated. In order to analyze the influences of different parameters on the closure time of the freezing wall, we performed the sensitivity analysis for three parameters of this numerical model. The analysis showed that, besides the head difference, the thermal conductivity of soil grain and pipe spacing are also the key factors that control the closure time of the frozen wall. Finally, a strengthening project of a metro tunnel with AGF method in South China was chosen as a field example. With the finite element software COMSOL Multiphysics® (Stockholm, Sweden), a three-dimensional (3D) numerical model was set up to simulate the change of frozen temperature field and groundwater flow field in the project area as well as the freezing process within 50 days. The simulation results show that the freezing wall appears in an asymmetrical shape with horizontal groundwater flow normal to the axial of the tunnel. Along the groundwater flow direction, freezing wall forms slowly and on the upstream side the thickness of the frozen wall is thinner than that on the downstream side. The actual pipe spacing has an important influence on the temperature field and closure time of the frozen wall. The larger the actual pipe spacing is, the slower the closing process will be. Besides this, the calculation for the average temperature of freezing body (not yet in the form of a wall) shows that the average temperature change of the freezing body coincides with that of the main frozen pipes with the same trend.

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Optimization of artificial ground freezing in tunneling in the presence of seepage flow

Cited by 99 publications

References 29 publications

Integrated BIM‐to‐FEM approach in mechanised tunnelling

Integrated BIM‐to‐FEM approach in mechanised tunnelling

Experimental Study on Influencing Factors of Characteristic Index of Local Horizontal Frozen Body of Double‐Row Pipe under Seepage

Case Study of Heat Transfer during Artificial Ground Freezing with Groundwater Flow

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