Numerical Analysis of Shallow Tunnels Under Static Loading: A Finite Element Approach

Zaid, Mohammad; Mishra, Swapnil

doi:10.1007/s10706-020-01647-1

Cited by 31 publications

(9 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Using Abaqus, 3D nonlinear finite element analysis was performed. The results indicated that tunnel diameter, overburden depth, and rock weathering indicate the stability of tunnels under severe loading conditions [11]. A study carried out on concrete pipe behavior during seismic shaking showed that, linear elastic and Mohr-Coulomb models had lower bending moments than hardening soil and hardening soil with small strain stiffness models [12].…”

Section: Introductionmentioning

confidence: 96%

Analysis of Different Earthquake Records on the Behaviour of Circular Tunnel in Sandy Soil

Aref,

Mahmoud,

Abd El-Halim

2024

Journal of Al-Azhar University Engineering Sector

View full text Add to dashboard Cite

Underground facilities serve several purposes as an essential part of the infrastructure of modern society. Subways, railroads, highways, material storage, sewage, and water transportation are applications of tunnels. Recently, increase in the frequency and magnitude of earthquakes have led to focus on the actual behavior of underground tunnels not only under static loads but also under dynamic effect of earthquakes. This study investigated 2D-numerical model circular tunnels under the influence of different earthquake records for sandy soils with different consisties. The soil types were dense, medium dense and loose sandy soils were studied. Three earthquake records, varying in peak ground acceleration (PGA) values and duration [Olympia earthquake (PGA= 0.16g and T= 89.08sec), Kalamata earthquake (PGA= 0.331g and T= 25.88sec) and Northridge earthquake (PGA=0.883g and T= 59.98sec)] have been conducted. A parametric study for circular tunnels in different soil states under static load and earthquake dynamic loads was examined. Specific points were observed to monitor deformations and stresses. Comparing the behaviour of tunnels under static load and earthquake has been illustrated. The analysis of results shows that the duration of earthquake records has a greater impact on horizontal displacement than PGA values. Peak ground acceleration (PGA) significantly affects vertical displacements, bending moments and axial forces. Axial forces are almost constant under earthquake records with PGA less than 0.331g, whereas PGA more than 0.331g increases slightly. Finally, the effect of earthquake records should be considered in tunnels behaviour and design to avoid permanent deformation, stresses or collapse of the tunnels.

show abstract

Section: Introductionmentioning

confidence: 96%

Analysis of Different Earthquake Records on the Behaviour of Circular Tunnel in Sandy Soil

Aref,

Mahmoud,

Abd El-Halim

2024

Journal of Al-Azhar University Engineering Sector

View full text Add to dashboard Cite

show abstract

“…Compared with the wide coal pillar, the narrow one has a considerable stabilizing effect on coal pillar roadways, which is more conducive to the conservation and recovery of coal resources. Sun [16][17][18] proposed an optimization plan for roadway layouts based on gas prevention and control, production costs, and continuity during mining under the multi-roadway layout of the high-gas fully mechanized mining surface. Gas prevention and control effects and economic benefits are significant after the comprehensive roadway layout is optimized.…”

Section: Introductionmentioning

confidence: 99%

The Optimized Roadway Layouts and Surrounding Rock Control Technology of the Fully Mechanized Mining Surface with Large Mining Heights in High-Gas Mines

Zhang

et al. 2022

Processes

View full text Add to dashboard Cite

Many problems exist in the layout of working surfaces in high-gas mines, such as the low efficiency of roadway excavation, difficulties in maintenance after excavation, and serious resource wastes due to difficulties in recovering coal pillars between roadways. Taking the project profile in the west wing mining area of Sihe Coal Mine as the background, this work proposed an optimization plan for the staggered-layer arrangement of roadways. The minimum retained size of the coal pillar was calculated through theoretical analysis, and the plastic failure and deformations of surrounding rocks under different coal pillar sizes and roadway layouts were compared based on finite difference numerical simulations. The reasonable retained size of the coal pillar was determined to be 45 m, and the roadway layout was determined according to the distribution of coal and rock strata in the mining field. The technical measures of base angle pressure relief blasting and strengthening support were proposed to ensure the safety and stability of surrounding rocks of roadways during the service period after the layout plan was optimized. Similar simulation tests were used to study the damage deformations and stress changes of the blasting pressure relief floor. On-site tests showed that the optimized roadway layout greatly improved the recovery rate of coal resources. In addition, surrounding rocks had good stability, and they could be simply repaired or serve the next working surface directly without being repaired. These research results provide a scientific basis and useful reference for similar projects.

show abstract

“…Tüm dünyada kentleşme ve yenilikçi inşaat uygulamaları kentlerin dikey genişlemesini artırmıştır. Tünel teknolojisi, ulaştırma ve lojistik hizmetlerinin daha hızlı gerçekleşmesi için en çok tercih edilen ulaştırma modları haline gelmiştir (Meguid ve ark., 2008;Zaid & Mishra, 2021). Bununla birlikte, karmaşık jeolojik yapı, su girişi, depremler ve kuvvetli yer hareketi gibi doğal veya yapay afetler sonucunda ortaya çıkan aşırı deformasyonlar (konverjans ve tasman) tünel yapımı sırasında veya sonrasında sıklıkla meydana gelir ve bu da tünellerin güvenilirliğini ciddi oranda etkiler (Li ve ark., 2013;Gao ve ark., 2018;Song ve ark., 2019;Wang ve ark., 2019).…”

Section: Introductionunclassified

“…Statik yükleme altında, sığ tünellerde stabilite analizi farklı araştırmacılar tarafından yapılmıştır (Athar ve ark., 2019;Naqvi ve ark., 2020;Zaid & Mishra, 2021). Ayrıca, Chehade & Shahrour (2008) ikiz tünel arasındaki hizalamanın etkisini incelemişlerdir.…”

Section: Introductionunclassified

Investigation of the Effect of Tunnel Geometry on Deformations in Shallow and Stratified Rock Formation

ADLIM

BOZATLI

Abut

2022

Yüzüncü Yıl Üniversitesi Fen Bilimleri Enstitüsü Dergisi

View full text Add to dashboard Cite

One of the main reasons for the surprising results that may be encountered in the construction of underground structures is that the rock masses have different formations. Deformations in the tunnel occur as a result of surcharge load from the structures on the surface, overloading, internal stresses in the rock or soil, and other factors. In-tunnel deformation measurement is important to determine the magnitude of plastic deformation in the tunnel and is an important step in monitoring tunnel safety. In this study, three-dimensional and non-linear behavior of tunnels designed as horseshoe or egg shape in a groundwater environment in a four-layered rock formation and gradually excavated with NATM (New Austrian Tunneling Method) principle were analyzed using the finite element method. The tunnel crown and wall, which were exposed to different loading conditions according to the excavation steps, were examined in detail in terms of permanent deformations. In addition, thanks to the deformation curves, the permanent deformations occurring along the critical sections of the tunnel during all excavation stages were compared relatively for both tunnel geometries. It has been determined that it is more advantageous to choose the tunnel geometry as egg-shaped rather than horseshoe type for reducing the settlement and the convergence in the shallow and layered rock environment.

show abstract

Numerical Analysis of Shallow Tunnels Under Static Loading: A Finite Element Approach

Cited by 31 publications

References 36 publications

Analysis of Different Earthquake Records on the Behaviour of Circular Tunnel in Sandy Soil

Analysis of Different Earthquake Records on the Behaviour of Circular Tunnel in Sandy Soil

The Optimized Roadway Layouts and Surrounding Rock Control Technology of the Fully Mechanized Mining Surface with Large Mining Heights in High-Gas Mines

Investigation of the Effect of Tunnel Geometry on Deformations in Shallow and Stratified Rock Formation

Contact Info

Product

Resources

About