Geotechnical Challenges of Tehran Metro Line 7 (South Northern Route)

Sadjadi, F. Seyed; Khalkhali, Ahad Bagherzadeh

doi:10.28991/cej-0309161

Cited by 4 publications

(3 citation statements)

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“…Sadjadi and Khalkhali (2018) conducted challenges in geotechnical investigation for tunneling in urban areas. The research/study primarily focused on the prerequisite for the study of geotechnical properties such as choosing the right TBM, ground water level, and engineering properties of soils [11]. Rezaee and Yousefi (2018) suggested a decision-making approach for recognizing and examining airport risk by giving consideration to cause effect relationships that illuminates the performance of the airport using Fuzzy Cognitive Map (FCM) method [12].…”

Section: Introductionmentioning

confidence: 99%

Fuzzy Knowledge Based System for Suitability of Soils in Airfield Applications

Sujatha¹,

Shivakumar²,

Devaraj

2021

Civ Eng J

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Proper design of roads and airfield pavements requires an in-depth soil properties evaluation to determine suitability of soil. Soft computing is used to model soil classification system's dynamic behaviour and its properties. Soft computing is based on methods of machine learning, fuzzy logic and artificial neural networks, expert systems, genetic algorithms. Fuzzy system is a strong method for mimicking human thought and solves question of confusion. This paper proposes a new decision-making approach for soil suitability in airfield applications without a need to perform any manual works like use of tables or chart. A fuzzy knowledge - based approach is built to rate soil suitability in qualitative terms for airfield application. The proposed model describes a new technique by defining fuzzy descriptors using triangular functions considering the index properties of soils as input parameters and fuzzy rules are generated using fuzzy operators to classify soil and rate its suitability for airfield applications. The data obtained from the results of the laboratory test are validated with the results of the fuzzy knowledge-based system indicating the applicability of the Fuzzy model created. The approach developed in this work is more skilled to other prevailing optimization models. Due to its system’s flexibility, it can be suitably customized and applied to laboratory test data available, thus delivering a wide range for any geotechnical engineer. Doi: 10.28991/cej-2021-03091643 Full Text: PDF

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Section: Introductionmentioning

confidence: 99%

Fuzzy Knowledge Based System for Suitability of Soils in Airfield Applications

Sujatha¹,

Shivakumar²,

Devaraj

2021

Civ Eng J

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“…However, deep buried roadway is located in the harsh environment of high confining pressure, high temperature and high permeability, which is easy to produce engineering geological disasters such as rheology, rock burst and large deformation of surrounding rock. Especially in the soft rock roadway, rock lithology metamorphism and surrounding rock failure occur frequently, the construction process is full of challenges [1]. This will seriously affect the stability of roadway surrounding rock, cause safety hazards to construction and traffic personnel, and cause huge economic losses to the roadway repeatedly renovated and maintained.…”

Section: Introductionmentioning

confidence: 99%

Elastic-viscoplastic solution of a circular tunnel in Hoek-Brown rock mass

Wang

Jiang

Lin

et al. 2021

Lat. Am. j. solids struct.

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A closed-form analytical solution to rheological phenomena is obtained based on Hoek-Brown (HB) yield criterion and the generalized Bingham model. Once the circular tunnel is excavated, an initial plastic region is formed. When the total stresses fulfil the yield condition, the initial plastic region steps into the viscoplastic region, in which the displacement develops with time. The one-dimensional constitutive equation of the generalized Bingham model is transformed into a three-dimensional expression in polar coordinates by combining the plane strain condition. With the help of equilibrium differential equation, geometric equation and boundary condition, the stress and displacement in the initial plastic region can be expressed. At the moment of t, the stresses and displacements are described similar to the solutions of the elasto-plastic state. The stresses, strains and displacements after transformation can be expressed in the viscoplastic region. The proposed solution was verified by the closed-form solution of circular tunnels in elastic-brittle-plastic rock mass.

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“…The prediction of ground movements and interactions of the existing tunnels is essential to maintain tunnelling operation. This prediction is significant, especially in shallow or major tunnels excavated in soft soils like clay or sandy soil, where the cost of remedial measures is very high and, in some cases, not acceptable (Bousbia & Messast, 2015;Ding et al, 2017;La et al, 2018;Sadjadi & Khalkhali, 2018;Shabna & Sankar, 2016).…”

Section: Introductionmentioning

confidence: 99%

Field monitoring and numerical analysis of ground deformation induced by tunnelling beneath an existing tunnel

et al. 2021

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The main challenge of implementing and constructing a new tunnel is to monitor and mitigate ground surface disturbances that may affect existing structures. This paper analyses the soil deformations induced by tunnelling under an existing tunnel and the effect of these deformations on the existing tunnel. Both field data and numerical modelling are included in this study. Numerical modelling based on the finite element method is established to simulate the tunnelling process and the technique used in the shield machine. The model is applied to the case study of the intersection between metro line 3 tunnel underneath the existing main sewage tunnel in Cairo. Settlement of the existing tunnel and the ground surface associated with the new excavation of the new metro line 3 tunnel are monitored. The numerical model is verified with the records from the field data and then used to conduct a comprehensive parametric study to investigate the effect of tunnel orientation angle, clear distance between tunnels, soil properties, and grouting around the tunnels, on ground deformation. The analysis considers the nonlinearity of the soil, the construction stages, the grouting around the tunnel, and the shield operating parameters. Findings quantify the importance of the studied parameters on the deformation and stresses of the existing tunnel and

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Geotechnical Challenges of Tehran Metro Line 7 (South Northern Route)

Cited by 4 publications

References 0 publications

Fuzzy Knowledge Based System for Suitability of Soils in Airfield Applications

Fuzzy Knowledge Based System for Suitability of Soils in Airfield Applications

Elastic-viscoplastic solution of a circular tunnel in Hoek-Brown rock mass

Field monitoring and numerical analysis of ground deformation induced by tunnelling beneath an existing tunnel

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