Geotechnical influence on existing subway tunnels induced by multiline tunneling in Shanghai soft soil

Zhang, Zhiguo; Huang, Maosong

doi:10.1016/j.compgeo.2013.11.008

Cited by 182 publications

(61 citation statements)

References 27 publications

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“…After the unit is deformed, according to the displacement-strain geometric equation (11) and the physical stress-strain physical equation (12), then combined with the equilibrium differential equation, (13) can be obtained:…”

Section: Seepage Field Status Calculationmentioning

confidence: 99%

“…Avgerinos et al [11] developed a basic three-dimensional (3D) finite-element (FE) model and discussed changes in hoop forces, bending moments, and lining deformations of the exiting tunnel due to excavation of the new tunnel. Zhang et al [12] presented the deformation analyses of existing subway tunnels induced by an earth pressure balance (EPB) shield during the process of above-overlapped and downoverlapped crossing tunnels with oblique angles based on the Shanghai Railway transportation project and in situ monitoring data. Hu et al [13] discussed in detail the criteria and measures for controlling the soil and tunnel deformation.…”

Section: Introductionmentioning

confidence: 99%

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Influence Zone Division and Risk Assessment of Underwater Tunnel Adjacent Constructions

Zhou

Gao

Liu

et al. 2019

Mathematical Problems in Engineering

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Compared with ordinary tunnels, the influence analysis of underwater tunnel adjacent constructions is more complicated. At present, the empirical method used to divide the influence zone of the tunnel adjacent constructions has great uncertainty. So it is of great significance for actual construction and design to determine the influence zone accurately according to theoretical calculations. In this paper, based on the Hoek–Brown nonlinear failure criterion of rock mass and taking seepage factor into account, the stress state of rock mass around the underwater tunnel adjacent constructions can be deduced by elastoplastic theory. Then combined with the concept of “loose zone-bearing zone”, the influence zone division method of underwater tunnel adjacent constructions is proposed, and it is applied to the analysis of engineering examples. Through the deduced theoretical formulas, the influence zone of underwater tunnel adjacent construction can be divided into extensively strong, strong, relatively strong, weak, and noninfluence zones. Corresponding the influence zones with the risk levels in the code, different control measures are adopted for different risk levels, which can provide certain guidance for the design and construction of tunnel in practical engineering.

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Section: Seepage Field Status Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence Zone Division and Risk Assessment of Underwater Tunnel Adjacent Constructions

Zhou

Gao

Liu

et al. 2019

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…Sagaseta [35] deduced the expression of three-dimensional displacement of stratum by using the mirror source-sink method. This formula can not only calculate the curve of surface settlement trough, but also calculate the displacement and stress of deep soil, so it is widely used [36][37][38][39][40][41][42][43]. However, the movement pattern of actual volume loss is not consistent with the assumed equivalent radial movement pattern in this method and has some deviation.…”

Section: Introductionmentioning

confidence: 99%

An Improved Method for Predicting the Greenfield Stratum Movements Caused by Shield Tunnel Construction

Tan

Zhang

et al. 2019

Applied Sciences

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Shield tunneling is becoming the preferred construction scheme for metro construction because of its advantages of fast construction speed and small disturbance. However, limited by process defects, the stratum movements induced by the construction of shield tunnels still affects the safety of nearby underground structures and aboveground buildings. Therefore, the reliable prediction of stratum movements is important. Described in this paper is an analysis method of the Greenfield stratum movements (Greenfield is an area of land that has not yet had buildings on it, stratum movements means the movement of various soil layers) caused by shield tunnel construction combining an elastic half-space model of mirror source-sink method with the use of modified analytical method. Based on the theoretical formula in this paper, not only can the curve of surface settlement trough be calculated, but also the three-dimensional displacement field of deep soil can be obtained. By comparing vertical and horizontal contour maps of Greenfield stratum movements, good consistency between theoretical formula results and centrifugal test results are shown. This solves the defects and limitations of existing two-dimensional formulas; furthermore, based on this, it is convenient to evaluate the effect on the other skewed underground structures through the elastic foundation beam and other similar methods; therefore, this paper can provide a wide guidance and service for the design and construction of underground engineering in the future.

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“…Closely spaced twin tunnels haven been widely adopted in Underground railways and road networks. Significant interactions during twin tunnel construction have been extensively investigated via on-site monitoring [1][2][3][4][5], laboratory model test [6,7], numerical simulation [8,9], and analytical analysis [10,11]. Most of these studies primarily focused on the interactions of twin tunnels using the mechanized method.…”

Section: Introductionmentioning

confidence: 99%

Geotechnical monitoring and safety assessment of large-span triple tunnels using drilling and blasting method

Li¹,

Zhang²,

Fang³

et al. 2019

J. vibroeng.

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The excavation of large-span triple tunnels using drilling and blasting method inevitably causes complicated load transfer effects and induces potentially damaging ground vibrations. In this study, the structural responses (including the surrounding rock pressure, normal-contact pressure between the primary and secondary linings, internal forces in the secondary lining) and the seismic responses (including peak particle velocity and corner frequency), are systematically recorded. It is found that the first-excavated left tunnel is influenced heavily by the excavation of the last-excavated middle tunnel, whereas it is hardly affected by the excavation of the second-excavated right tunnel. The load carried by the primary lining is approximately three times as that carried by the secondary lining. The middle tunnel was in the least desirable state due to the formation of the large Protodyakonov's equilibrium arch (PEA). Based on timely feedback of the comprehensive monitoring system, a series of vibration-reducing techniques were applied and effectively guaranteed safety during blasting construction. By referring to Chinese codes, the minimum safety factor of the secondary lining is 1.3; the maximum PPV (0.15 cm/s) is lower than the allowable value; and the corner frequency (40-140 Hz) will not cause resonant vibration of the Great Wall.

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Geotechnical influence on existing subway tunnels induced by multiline tunneling in Shanghai soft soil

Cited by 182 publications

References 27 publications

Influence Zone Division and Risk Assessment of Underwater Tunnel Adjacent Constructions

Influence Zone Division and Risk Assessment of Underwater Tunnel Adjacent Constructions

An Improved Method for Predicting the Greenfield Stratum Movements Caused by Shield Tunnel Construction

Geotechnical monitoring and safety assessment of large-span triple tunnels using drilling and blasting method

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