Feasibility evaluation for excavation of Naghshe Jahan Square subway station by underground methods

Cherlo, Morteza Abdi; Hashemolhosseini, Hamid; Cheraghi, Masoud; Mahdevari, Saeed

doi:10.1016/j.jrmge.2013.09.003

Cited by 9 publications

(2 citation statements)

References 9 publications

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“…PBA is a technique based on the traditional concealed undercutting method, which integrates the characteristics of cover excavation method and forms a perfect frame bearing system of arch-beam-column before most of the soil has been excavated. The essence of the PBA method is to attempt to quickly form the overall framework, consisting of side piles (or side columns), steel pipe piles supporting the arch section, and then, under the protection of the arch structure, to excavate the sections [6,7]. The pile-beam-arch method of construction has lower ground disturbance and higher structural safety [8], which is particularly suitable for the construction of metro stations with heavy ground traffic, concentrated underground pipelines and high ground settlement requirements [9,10].…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Characteristics and Ground Surface Settlement Influence of the Rise–Span Ratio of the Pile–Beam–Arch Method

2023

Applied Sciences

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The pile–beam–arch method (PBA) method is increasingly being used in the construction of metro stations with complex traffic conditions. The rise–span ratio of the arch not only affects the height of the station, but also affects the rationality of the design of subway stations and the safety of construction. The mechanical response of steel pipe piles with different rise–span ratios and the effect of controlled surface settlement have been investigated in the interactions involved in pile–soil system. In this paper, the finite element model of each rise–span ratio was established, and the rationality of the model was demonstrated by comparing the numerical simulation calculation with the field surface settlement monitoring data. The mechanical characteristics and influence analysis of the surface deformation during the excavation of the cave pile method were investigated. The results show that the maximum axial force of the central pile first decreases and then increases with the increase in the rise–span ratio. The maximum bending moment of the arch decreases as the rise–span ratio increases, and the maximum axial force of the arch is negatively correlated with the rise–span ratio. The maximum axial force of the central pile is located at the bottom plate. Due to the symmetry of the structure, the bending moment of the centre pile is small, but the maximum bending moment of the whole station is located at the side wall of the bottom plate. As the rise–span ratio increases, the surface settlement first decreases and then increases. The construction of the pilot tunnel and the upper arch is the most important factor leading to the surface settlement, so it is necessary to strengthen the soil layer.

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Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Characteristics and Ground Surface Settlement Influence of the Rise–Span Ratio of the Pile–Beam–Arch Method

2023

Applied Sciences

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“…The MJS grouting method can also be used in karst areas to avoid the influence of ground movement of adjacent piles caused by deep excavation [13]. The tunnel pile driving method does not need to destroy the road surface and does not affect the construction technology of traffic operation [19]. Taking advantage of the MJS method, which can be grouted at any angle, the surface settlement caused by the tunnel pile excavation subway is grouted and reinforced, and then the tunnel soil is excavated to reduce the stress loss and control the surface settlement.…”

Section: Introductionmentioning

confidence: 99%

Deformation Analysis and Reinforcement Effect of Tunnel Pile Excavation of a Subway Station in a Weak Stratum

Lv,

Lu,

Huang

et al. 2023

Buildings

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The underground hole pile excavation method causes a large vertical displacement in a weak stratum, which affects the safety of structures. For the first time, the hole pile excavation method is being used to construct a subway station in South China, and the settlement law of the area is not clear. It is important to clarify the deformation law of the hole pile excavation method in weak strata and the effect achieved by appropriate reinforcement measures. In this paper, by establishing a three-dimensional finite element model of the structure–soil contact element and combining it with the field monitoring data, the law of surface settlement caused by the hole pile excavation method with different thicknesses of the weak stratum has been studied. In order to improve the stability of the surrounding rock and reduce the vertical deformation of the surface, the Metro Jet System (MJS) is used to form inclined piles in the area of large surface deformation, and the effect after reinforcement was evaluated. The results show that as the weak layer thickness ratio increases, the surface settlement also increases. In the case of no reinforcement, a vertical settlement of 116 mm can be achieved when the thickness of the weak layer is 14 m. The vault of the tunnel is in the weak layer and the deformation is obvious. When the vault is not in the weak layer, the settlement is obviously reduced. After MJS pile reinforcement, under the action of soil extrusion, the self-stability of the surrounding rock is strengthened, and the oblique jet grouted pile forms a stable ‘triangle’. The vertical settlement value is basically stable at around 30 mm, which meets the requirements of the regulations. If the tunnel is not reinforced, the self-stability of the surrounding rock above the tunnel arch is poor and the maximum settlement is at the surface. After MJS reinforcement, the maximum settlement is at the vault. The vertical settlement of the ground surface can be effectively controlled by using the MJS pile forming technology in the middle of the tunnel pile driving method.

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Pile and Concrete Arch Pre-supporting System (PCAPS) for Construction of Underground Subway Stations in Soft Grounds

Parsapour,

Mohammadi

2024

Indian Geotech J

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Feasibility evaluation for excavation of Naghshe Jahan Square subway station by underground methods

Cited by 9 publications

References 9 publications

Study on the Mechanical Characteristics and Ground Surface Settlement Influence of the Rise–Span Ratio of the Pile–Beam–Arch Method

Study on the Mechanical Characteristics and Ground Surface Settlement Influence of the Rise–Span Ratio of the Pile–Beam–Arch Method

Deformation Analysis and Reinforcement Effect of Tunnel Pile Excavation of a Subway Station in a Weak Stratum

Pile and Concrete Arch Pre-supporting System (PCAPS) for Construction of Underground Subway Stations in Soft Grounds

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