Centrifuge and numerical modelling of stress transfer mechanisms and settlement of pile group due to twin stacked tunnelling with different construction sequences

Soomro, Mukhtiar Ali; Mangi, Naeem; Xiong, Hao; Kumar, Manoj; Mangnejo, Dildar Ali

doi:10.1016/j.compgeo.2020.103449

Cited by 30 publications

(15 citation statements)

References 42 publications

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“…By analyzing the measured and computed results, Hong et al (2015) found that load redistribution occurs among piles during twin tunnel excavation. Recently, Soomro et al (2020b) also used centrifuge experiments to study the influence of tunnel excavation on a pile group.…”

Section: Failure Mechanismmentioning

confidence: 99%

Failure Mechanism of the Bearing Stratum at the End of a Pile Induced by Shield Tunnel Excavation Beneath a Piled Building

et al. 2021

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Section: Failure Mechanismmentioning

confidence: 99%

Failure Mechanism of the Bearing Stratum at the End of a Pile Induced by Shield Tunnel Excavation Beneath a Piled Building

et al. 2021

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“…erefore, how to evaluate and control the effect of tunnelling on the built environment to avoid ground collapse and structural failure is a crucial topic. Some scholars have conducted extensive research on the tunnelling-induced displacements of the ground [27][28][29] and environmental structures [30][31][32]. Others have performed in-depth analysis on the environmental disasters including ground collapse [33][34][35][36][37] and structural failure [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Movements and Its In‐Process Control of Ground and Built Structures due to Tunnelling in Urban Areas

Zhang

Cao

Fei

et al. 2022

Advances in Civil Engineering

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Tunnelling-induced environmental responses including ground movements and deformation of the environmental structures are the two prominent issues needed to be carefully disposed in urban areas. This paper tries to develop a theoretical framework to evaluate and control the environmental deformation to avoid two disasters including ground collapse and structural failure. According to the mechanical responses of the ground due to tunnelling, the urban ground in China can be roughly divided into three types including composite multilayered ground, highly water-bearing ground, and mixed rock ground. The displacements of ground and environmental structures due to tunnelling in multilayered ground are emphatically discussed in view of its largest proportion distribution. The cumulative and mutational characteristics of the displacements are considered, which can be the main basis for distinguishing the occurrence of two types of disasters. Based on the development of the displacements, the three-stage evolution model of disaster is established. Combined with the existing displacement and degeneration of the ground and structures and the safety factor, the displacement control standards can be eventually determined. The theoretical framework of in-process control is established which is based on the prediction, measurement, and control standards of the displacements. In the framework, the prediction model can be modified in time, and the tunnelling parameters can be adjusted synchronously. The current research is successfully applied in the Qinghuayuan Tunnel Project.

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“…Some scholars have shown that the excavation of shallow tunnels will cause horizontal and vertical movement of surface buildings, and it is necessary to focus on the settlement of the ground (Dindarloo and Siami-Irdemoosa 2015;Qian Fang et al 2016). Combining the results of centrifugal simulation experiments and numerical simulations by Mukhtiar Ali Soomro et al (2020), it has shown that the excavation sequence will have a greater impact on existing buildings. The above researches mainly focus on circular tunnels, and most of the scenarios involve crossing under the existing underground structures.…”

Section: Introductionmentioning

confidence: 99%

Impact Analysis for Safety Prevention and Control of Special-Shaped Shield Construction Closely Crossing Multiple Operational Metro Tunnels in Shallow Overburden

Dai

Huang

et al. 2021

Geotech Geol Eng

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With the improvement of the urban rail transit network, crossing construction has become an inevitable situation in the construction of subway tunnels. The special-shaped shield has great advantages in space utilization and the ability to cross narrow roads. However, due to its section characteristics, the special-shaped shield under construction often has a greater impact on the existing operating subway. Based on the background of quasi-rectangular shield tunneling through multiple existing tunnels, this paper proposes a two-stage safety pre-control (prevention before construction and control during construction) treatment method for large crosssection special-shaped shield construction. With three protection or auxiliary measures, the pre-reinforcement and process treatment of the crossing construction section are carried out. The effectiveness of these three measures is evaluated by establishing a 3D finite element model. Moreover, the reasonable range of construction parameters of the quasi-rectangular shield is optimized by numerical calculation. This study exposes the strata displacement law and tunnel deformation characteristics under corresponding protection or auxiliary measures and optimized construction parameters. The analysis proves that the proposed two-stage method can effectively reduce the impact of shield tunneling on the surrounding environment and existing tunnels. After applying the corresponding safety precautions, the surface uplift and tunnel uplift are reduced by about 30% on average, and the surface settlement is reduced by about 80%. Parameter optimization analysis shows that the thrust (face) pressure and grouting volume (filling rate) are more sensitive to environmental impact. It is recommended to select 100-160 kPa thrust pressure, 200% grouting filling rate, moderate grouting pressure, and slow propulsion speed in construction.

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Centrifuge and numerical modelling of stress transfer mechanisms and settlement of pile group due to twin stacked tunnelling with different construction sequences

Cited by 30 publications

References 42 publications

Failure Mechanism of the Bearing Stratum at the End of a Pile Induced by Shield Tunnel Excavation Beneath a Piled Building

Failure Mechanism of the Bearing Stratum at the End of a Pile Induced by Shield Tunnel Excavation Beneath a Piled Building

Movements and Its In‐Process Control of Ground and Built Structures due to Tunnelling in Urban Areas

Impact Analysis for Safety Prevention and Control of Special-Shaped Shield Construction Closely Crossing Multiple Operational Metro Tunnels in Shallow Overburden

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