Effects of air permeability and perimeter area on air losses in compressed air tunnelling

Ahangar Asr, A; Javadi, A

Numerical investigation into the effects of geometrical alterations in cut-off walls on seepage through water-retaining structures (2023)
Presentation / Conference
Thomas, A. J., & Asr, A. A. (2023, April). Numerical investigation into the effects of geometrical alterations in cut-off walls on seepage through water-retaining structures. Paper presented at 2023 Annual Conference of the UK Association for Computational Mechanics., University of Warwick

In this paper numerical analysis has been conducted to expand existing research on cut-off walls from previous studies such as [1],[2]. This study is aimed at studying a unique geometric alignment design that accommodates ‘branches’ on either side of... Read More about Numerical investigation into the effects of geometrical alterations in cut-off walls on seepage through water-retaining structures.

The joint influence of cavities presence and rapid drawdown condition on discharge rate through earth dams (2019)
Presentation / Conference
Al-Ateya, H., & Ahangar Asr, A. (2019, April). The joint influence of cavities presence and rapid drawdown condition on discharge rate through earth dams. Presented at 26th Annual Conference of the UK Association for Computational Mechanics (UKACM), City University London, UK

Seepage measurement and control is one of the most significant considerations in designing and safety of earth dams. This numerical study aims to simulate the influence of cavities presence on seepage through earth dams taking into account rapid dr... Read More about The joint influence of cavities presence and rapid drawdown condition on discharge rate through earth dams.

An evolutionary-based modelling approach for predicting the effective stress parameter in unsaturated soils (2018)
Presentation / Conference
Ahangar Asr, A., & Javadi, A. (2018, August). An evolutionary-based modelling approach for predicting the effective stress parameter in unsaturated soils. Presented at The 7th International Conference on Unsaturated Soils UNSAT2018, Hong Kong, China

Effective stress parameter affects the stress equation and is implemented to calculate the effective stress value which directly influences deformations and failures in unsaturated soils. Evolutionary polynomial regression is a data mining-based tech... Read More about An evolutionary-based modelling approach for predicting the effective stress parameter in unsaturated soils.

Numerical analysis of the influence of cavities on seepage through earth dams (2018)
Presentation / Conference
Alateya, H., & Ahangar Asr, A. (2018, June). Numerical analysis of the influence of cavities on seepage through earth dams. Presented at 6th European Conference on Computational Mechanics (ECCM 6) & 7th European Conference on Computational Fluid Dynamics (ECFD 7), Glasgow, UK

Seepage through earth dams is one of the main reasons of sudden earth dam failures through weakening the earth dam structure and the piping phenomenon. Cavities existence under the hydraulic structures can lead to heavy structural financial damages a... Read More about Numerical analysis of the influence of cavities on seepage through earth dams.

Numerical investigation of unloading effects due to excavation of geometrically non-homogeneous stratified rock masses using finite element analysis (2018)
Presentation / Conference
Sauffisseau, R., & Ahangar Asr, A. (2018, June). Numerical investigation of unloading effects due to excavation of geometrically non-homogeneous stratified rock masses using finite element analysis. Presented at 6th European Conference on Computational Mechanics (ECCM 6) & 7th European Conference on Computational Fluid Dynamics (ECFD 7), Glasgow, UK

With the growth of population in the cities and the lack of land nearby, buildings are now reaching heights and depths (basements) demanding larger and deeper foundations. These excavations cause the unloading of the ground in some directions which c... Read More about Numerical investigation of unloading effects due to excavation of geometrically non-homogeneous stratified rock masses using finite element analysis.

An evolutionary approach to modelling effects of chemicals on soils (2016)
Presentation / Conference
Ahangar Asr, A., & Javadi, A. (2016, March). An evolutionary approach to modelling effects of chemicals on soils. Presented at ACME-UK 24th Conference on Computational Mechanics, Cardiff

As part of a study undertaken to assess the impact of high-pH fluid circulation on the shear strength behaviour of a compacted soil with different additives and due to the complexity of the existing constitutive theories, a new approach was used, bas... Read More about An evolutionary approach to modelling effects of chemicals on soils.

Air losses through the tunnel face in compressed air tunneling : a case study (2015)
Presentation / Conference
Ahangar Asr, A., & Javadi, A. (2015, September). Air losses through the tunnel face in compressed air tunneling : a case study. Presented at 16th European Conference on Soil Mechanics and Geotechnical Engineering, Edinburgh, UK

In this study field measurement data from Feldmoching tunnel in Munich were used to develop a model with the capability of predicting the air losses in compressed air tunnelling technique. In this tunnelling project, compressed air was used to contro... Read More about Air losses through the tunnel face in compressed air tunneling : a case study.

Modeling the thermo-mechanical triaxial shearing behavior of unsaturated soils using EPR (2014)
Presentation / Conference
Ahangar Asr, A., Javadi, A., & Khalili, N. (2014, July). Modeling the thermo-mechanical triaxial shearing behavior of unsaturated soils using EPR. Presented at International Conference on Unsaturated Soils: Research & Applications UNSAT2014, Sydney, Australia

The proposed approach for modeling the thermo-mechanical of behavior of unsaturated soils is based on the evolutionary polynomial regression (EPR), which generates a transparent and structured representation of the behavior of systems directly from r... Read More about Modeling the thermo-mechanical triaxial shearing behavior of unsaturated soils using EPR.

The effect of cut-off wall angle on seepage and uplift pressure under dams
Presentation / Conference
dams. Presented at UK Association for Computational Mechanics (UKACM) Conference 2021, Loughborough University, UK

Seepage under dams can result in high uplift pressure experienced usually under the downstream of the dam which may lead to instability and potentially the failure of the dam. Cut-off walls are the primary solution to minimize the effects caused by t... Read More about The effect of cut-off wall angle on seepage and uplift pressure under dams.

A comparative analysis of the stability of homogeneous and non- homogeneous soil slopes subject to various surcharge loading conditions
Presentation / Conference
conditions. Presented at UK Association for Computational Mechanics (UKACM) Conference 2021, Loughborough University, UK

Slope stability is a topic of great importance within the scope of civil engineering, this study investigates the differences between homogeneous and non-homogenous soil slopes when various surcharge loading conditions are applied. To analyze slope s... Read More about A comparative analysis of the stability of homogeneous and non- homogeneous soil slopes subject to various surcharge loading conditions.

Relationship between shallow foundation shape and contact area, and the settlement in granular soils
Presentation / Conference
Starkey, T., & Ahangar Asr, A. Relationship between shallow foundation shape and contact area, and the settlement in granular soils. Presented at UK Association for Computational Mechanics (UKACM) Conference 2021, Loughborough University, UK

The aim of this investigation is to discover the effects of foundation shape and contact area on foundation settlement. There is little research at the current time which relates the increase in size or scale effects to the settlement, with current r... Read More about Relationship between shallow foundation shape and contact area, and the settlement in granular soils.

Effects of various surcharge loading conditions on the stability of soil slopes
Presentation / Conference
Leeworthy, T., & Ahangar Asr, A. Effects of various surcharge loading conditions on the stability of soil slopes. Presented at UK Association for Computational Mechanics 2020, Loughborough University

The stability of soil slopes is a theme which has great significance within the field of civil engineering, this paper will focus on the analysis of soil slopes under varying surcharge loads. There are two main methods used in the analysis of soil sl... Read More about Effects of various surcharge loading conditions on the stability of soil slopes.

Numerical investigation into the effect of various surcharge loadings on propped wall excavations and embankments
Presentation / Conference
Ogunyemi, O., & Ahangar Asr, A. Numerical investigation into the effect of various surcharge loadings on propped wall excavations and embankments. Presented at UK Association for Computational Mechanics 2020, Loughborough University

Several guidance and formulation have been developed in the literature to account for the analysis of external surcharges adjacent to a propped excavation but less attention has been paid to the presence of sloping ground or embankments. However, CIR... Read More about Numerical investigation into the effect of various surcharge loadings on propped wall excavations and embankments.

Numerical investigation into the effect of cavity size and location on stability of earth dams
Presentation / Conference
Alateya, H., & Ahangar Asr, A. Numerical investigation into the effect of cavity size and location on stability of earth dams. Presented at 25th UKACM Conference on Computational Mechanics, University of Birmingham, Birmingham, United Kingdom

Numerical investigations performed to study the effect of the presence of cavities on stability of slopes considering rapid draw down conditions. The aim of the investigation is was to study the influence of different factors (such as diameter and lo... Read More about Numerical investigation into the effect of cavity size and location on stability of earth dams.

Stability analysis of geometrically non-homogeneous stratified slopes
Presentation / Conference
Sauffisseau, R., & Ahangar Asr, A. Stability analysis of geometrically non-homogeneous stratified slopes. Presented at 25th UKACM Conference on Computational Mechanics, University of Birmingham, Birmingham, United Kingdom

Due to ongoing construction of cities and development of new buildings and infrastructures, many natural slopes in and around urban areas are often subjected to cuts. These excavations result in dramatic changes in the geometry of slope faces mostly... Read More about Stability analysis of geometrically non-homogeneous stratified slopes.

Effects of air permeability and perimeter area on air losses in compressed air tunnelling
Presentation / Conference
Ahangar Asr, A., & Javadi, A. Effects of air permeability and perimeter area on air losses in compressed air tunnelling. Presented at 23rd UK Conference of the Association for Computational Mechanics in Engineering, Swansea, UK

Field measurement data obtained from a tunnel in Munich was used to develop a model to predict air losses in the process of compressed air tunnelling. In the implemented case study, compressed air was used to control the groundwater followed by placi... Read More about Effects of air permeability and perimeter area on air losses in compressed air tunnelling.

All Outputs (16)