Investigation on passive pile responses subject to adjacent tunnelling in anisotropic clay

Li, Yongqin; Zhang, Wengang

doi:10.1016/j.compgeo.2020.103782

Cited by 38 publications

(13 citation statements)

References 35 publications

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“…In recent years, most studies mainly focus on the e ects of shield tunneling on existing pile foundation [1,2,[9][10][11][12][13][14], and report related to cutting the RC piles by shield is few. Based on the construction of Suzhou metro in China, eld test of shield cutting RC piles was carried out, wear and damage of the modi ed rippers were studied by Li et al [7].…”

Section: Introductionmentioning

confidence: 99%

Full‐Scale Laboratory Test of Cutting Large‐Diameter Piles Directly by Shield Cutterhead

Wang

Xiong

et al. 2022

Advances in Civil Engineering

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Based on the TBM tunnel of Red Line of Tel Aviv in Israel, this paper carried out laboratory tests of shield cutting concrete and reinforced concrete piles and investigated cutting performance of cutter, failure model of rebars, length of damaged rebars, and cutter vibration. The results indicate that under the condition of low tunneling speed and rotating speed, vibration of the cutterhead is small, and vibration of the center cutterhead is more obvious in the radial direction of the cutterhead. Cross sections of broken rebars mainly consist of shear section, tensile-shear section, tensile-compressive section, and bending section. Considering the tunnel status, it is recommended to adopt excavation speed of 3∼5 mm/min, and rotating speed of 1.0∼1.3 r/min. While cutting RC piles, the principle of “low excavation speed, high rotating speed, and less disturbance” is recommended. Cutting with disc cutters is efficient and the torque of which is stable but the length of the rebars got from cutting varies a lot. It is recommended that majorities of the cutters shall be disc cutters and supplemented with drag bits and tear cutters.

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Section: Introductionmentioning

confidence: 99%

Full‐Scale Laboratory Test of Cutting Large‐Diameter Piles Directly by Shield Cutterhead

Wang

Xiong

et al. 2022

Advances in Civil Engineering

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“…Zhao [11] analyzed the lateral and axial responses of pile foundations owing to tunnel excavation using a two-stage method. Li [12] investigated the effect of tunnel construction on pile mechanical responses based on a finite element model considering an anisotropic soil model. The computed results indicated that piles with a deeper buried depth and higher stiffness are more capable of mitigating the influence of tunnel excavation.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Responses of Slurry Shield Underpassing Existing Bridge Piles in Upper-Soft and Lower-Hard Composite Strata

Lin

et al. 2022

Buildings

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With the development of urban metro systems, shield tunnels that pass through existing bridge pile foundations have become an inevitable engineering problem. Therefore, ensuring the stability of the strata and existing bridge piles during tunnel construction is a common goal in engineering practice. Currently, research on the mechanical responses of strata and existing piles under different conditions of upper-soft and lower-hard composite strata during shield tunneling has not been conducted extensively. This paper presents a numerical simulation of a shield tunnel passing through an existing bridge pile foundation in upper-soft and lower-hard composite strata. Subsequently, the surface subsidence and mechanical responses of a single pile were analyzed and evaluated. Additional stresses generated in the soil by existing bridge piles and the selection of grouting pressure were considered to optimize the driving pressure of the slurry shield. Allowable values were proposed to evaluate the construction disturbances caused by the tunnel excavation. The results show that the disturbance to the soil and existing piles is significantly influenced by the hard-rock height ratio, and the surface subsidence increases when the hard-rock height ratio decreases. The displacement and internal force of a single pile are significantly influenced by the load applied to the pile. This study demonstrates the changes in the mechanical responses of a single pile during shield tunnel boring, and provides in-depth insights into the deformation control caused by shield underpassing structures in upper-soft and lower-hard composite strata.

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“…Due to the constraints of urban underground space resources, there are crisscross tunnel projects. When a tunnel project close to a high-speed railway appears, there must be a greater risk from the construction point of view alone [15][16][17][18][19]. In contrast, a pile-soil composite foundation with the presence of an adjacent tunnel under high-speed train loads is more complex than the ordinary pile-soil composite foundation, and the differences in dynamic response characteristics are unknown.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Pile-Soil Foundation with an Adjacent Tunnel under the High-Speed Train Loads: A Case Study

Zhu

et al. 2022

Applied Sciences

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In order to study the dynamic response characteristics of a pile-soil foundation when an adjacent tunnel exists, both model tests and numerical simulations were performed in this study. Taking the peak vibration acceleration, peak vibration velocity, and peak vibration displacement as the evaluation indexes of the dynamic response, the dynamic response of the pile-soil foundation with an adjacent tunnel under high-speed train loads is studied. A method of dividing the affected zones of the dynamic response based on the safety threshold is provided in this paper, which can evaluate the safety of the adjacent tunnel under the action of train load. Additionally, the effect of train speed on dynamic response is further analyzed. The results show that the dynamic response index inside the foundation decays significantly with increasing distance from the surface when the train load is applied, regardless of the presence or absence of the adjacent tunnel. Compared with an ordinary pile-soil foundation, the dynamic response indexes inside the foundation increase significantly when there is an adjacent tunnel. With the increase in the horizontal distance from the pile foundation, the distribution characteristics of the horizontal transverse direction of each dynamic response index inside the foundation change from a “wavy” distribution to a monotonically decreasing distribution. According to the safety threshold of vibration velocity, the foundation is divided into the hazardous affected zone, strongly affected zone, and weakly affected zone, and then the corresponding vibration reduction measures are adopted. With the increase in train speed, the effect of tunnel structure on the attenuation of dynamic response in a pile-soil foundation becomes more obvious.

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Investigation on passive pile responses subject to adjacent tunnelling in anisotropic clay

Cited by 38 publications

References 35 publications

Full‐Scale Laboratory Test of Cutting Large‐Diameter Piles Directly by Shield Cutterhead

Full‐Scale Laboratory Test of Cutting Large‐Diameter Piles Directly by Shield Cutterhead

Mechanical Responses of Slurry Shield Underpassing Existing Bridge Piles in Upper-Soft and Lower-Hard Composite Strata

Dynamic Response of Pile-Soil Foundation with an Adjacent Tunnel under the High-Speed Train Loads: A Case Study

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