Research on subway shield tunnel induced by local water immersion of collapsible loess

Weng, Xiaolin; Zhou, Rongming; Rao, Wei; Wang, Deng

doi:10.1007/s11069-021-04727-4

Cited by 27 publications

(6 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Owing to rapid population growth and extensive infrastructure development in western China, where loess predominates, underground tunnels have become a prevalent solution for mitigating surface traffic congestion in urban areas. Shield tunnelling is an efficient and commonly employed technique for constructing metro tunnels in major cities in loess regions (Gan et al 2024;Qiu et al 2022;Weng et al 2021;Zhu et al 2022c).…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of ground surface settlement induced by shield tunnelling considering the soil parameter spatial variability in loess strata

Zhang,

Lai,

Wang

et al. 2024

Preprint

View full text Add to dashboard Cite

Ground surface settlement (GSS) induced by shield tunnelling in loess soils represents a substantial challenge for geotechnical and structural engineers. Despite numerous attempts to predict GSS caused by tunnelling, considering the spatial variability of the soil parameters remains open. Thus, this study analysed the Lanzhou Metro Line 1 in China. In particular, the spatial variability of Young's modulus in the loess layer was simulated using random field theory coupled with finite difference analysis. Random fields were generated using the covariance matrix decomposition method, which is consistent with a specified numerical mesh. Subsequently, Monte Carlo simulations were performed using both deterministic and random field difference methods to explore the effect of horizontal scale fluctuations due to shield tunnelling on the ground motion. The results indicated that Young's modulus of loess exhibited a normal distribution. The vertical scale of fluctuation of Young's modulus in the loess layer spanned from 1.32 m to 1.51 m. These findings demonstrate that random field analysis can comprehensively characterise the trend, magnitude and fluctuation range of the GSS. Moreover, the findings indicate that GSS is underestimated when neglecting spatial variability compared with traditional deterministic analysis.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical analysis of ground surface settlement induced by shield tunnelling considering the soil parameter spatial variability in loess strata

Zhang,

Lai,

Wang

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…So far, there is no precedent for the construction of slotted shields in a loess tunnel. There is no systematic research on the application of a shield method in high-speed railway tunnels, and there is little experience that can be used for reference (Jiang et al, 2017;Yang, et al, 2020;Niu et al, 2021;Weng et al, 2021;Zhu, 2021;Mei et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Study on the construction deformation of a slotted shield in loess tunnels with different buried depths and large sections

Han

Fang

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

Since there is no precedent for the use of slotted shield tunneling in the large section of high-speed railways in China, the relevant technological accumulation and systematic research achievements are few. Therefore, this paper provides theoretical support for loess tunnel construction decision-making through the study of slotted shields and is expected to promote the mechanization and even intelligent construction of a high-speed iron-loess tunnel. Taking the Luochuan tunnel of the Xiyan high-speed railway as the engineering background, this paper uses the numerical simulation software packages of ANSYS and FLAC3D to study the tunnel deformation (surface settlement, vault settlement, tunnel bottom uplift, and horizontal convergence) caused by the slotted shield construction in three different buried depths of 30, 40, and 50 m surrounding rock. The deformation law and mechanical characteristics of a cutter shield construction of large cross-section loess tunnels under the influence of different buried depths are put forward. Results showed that 1) the mutual interference between the working procedures can be significantly reduced by inserting the cutting tool into the soil instead of the advanced tubule before excavation; 2) the settlement in the upper part of the longitudinal axis of the tunnel is the largest; the greater the depth of the tunnel is, the smaller the surface settlement is; and 3) the horizontal deformation of the arch waist and foot of the tunnel under different buried depths is symmetrically distributed into the tunnel during the whole process of slotted shield tunneling.

show abstract

“…At present, most studies on the subway construction mainly focuses on settlement, eccentric compression columns, and impact on surrounding buildings, while there is almost no impact on the internal structure of the station. [19][20][21][22][23][24]. In addition, the platform width of some stations is wider, and the difference between the side span and the middle span of stations is greater.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Pile-Beam-Arch Construction on the Stratum and Station Support Structure

et al. 2023

View full text Add to dashboard Cite

The PBA construction method is suitable for urban subway construction in situations with dense traffic and many surrounding buildings and can effectively reduce surface disturbance and control surface subsidence. Based on field-measured data, this study creates numerical finite element models of 3D stratum-structure, studies the influence of each process conversion on the subsidence of the ground surface and the force of the station supporting structure during the construction of the PBA station, and clarifies the optimal construction parameters. The research results show that the consistency between the field monitoring data and the simulation data is more than 80%, which verifies the correctness of the model. It is concluded that the formation of the pile-beam-arch is the main part of the supporting structure and that digging the pilot tunnel and the formation of the beam arch are the control factors of surface settlement. Based on this, the best sequence of pilot tunnel excavation and arch buckle of the two-story two-span station is obtained, and the optimal pilot tunnel excavation scheme of first the middle and then the side, first the upper and then the lower, and the best arch buckle scheme of the synchronous arch buckle on both sides is determined. The results of the research can serve as a guideline when selection the construction parameters for similar PBA stations.

show abstract

Research on subway shield tunnel induced by local water immersion of collapsible loess

Cited by 27 publications

References 15 publications

Numerical analysis of ground surface settlement induced by shield tunnelling considering the soil parameter spatial variability in loess strata

Numerical analysis of ground surface settlement induced by shield tunnelling considering the soil parameter spatial variability in loess strata

Study on the construction deformation of a slotted shield in loess tunnels with different buried depths and large sections

The Influence of Pile-Beam-Arch Construction on the Stratum and Station Support Structure

Contact Info

Product

Resources

About