Effects of twin tunnels construction beneath existing shield-driven twin tunnels

Fang, Qian; Zhang, Dingli; Li, Qianqian; Wong, Louis Ngai Yuen

doi:10.1016/j.tust.2014.10.001

Cited by 160 publications

(45 citation statements)

References 25 publications

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“…(2) Prediction of the foot settlement and the vertical load Based on the above analysis of the earth pressure acted on the steel rib, the foot settlement and vertical load at the foot of the steel rib with the support of the feet-lock pipe was calculated by using equations (9) and (36). In order to obtain a better comparison, another two conditions were also performed.…”

Section: Eoretical Predictionmentioning

confidence: 99%

“…where θ is the installation angle of the feet-lock pipe, i.e., the angle between the horizontal line and axial line of the feetlock pipe. From the above derivation, three unknown forces X 1 , X 2 , and X 3 shown in Figure 4 can be finally solved by substituting equations (3)-(7) and (23)-(34) into equation (9). Meanwhile, the vertical load at the foot of the steel rib can be easily obtained.…”

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confidence: 99%

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Vertical Load and Settlement at the Foot of Steel Rib with the Support of Feet‐Lock Pipe in Soft Ground Tunnel

Chen

Luo

et al. 2019

Advances in Civil Engineering

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In soft ground tunnels, feet-lock pipes have been widely used to decrease the concentration of load and settlement at the foot of steel ribs. This paper presents an analytical method to predict the vertical load and settlement at the foot of steel ribs with the support of the feet-lock pipe. First, the mechanical model of a steel rib and feet-lock pipe combined structure involving the ground reaction at the foot was proposed. In this model, the deformation compatibility among the steel rib, the feet-lock pipe, and the ground at the tunnel foot were considered, and an elastic foundation beam model with double parameter for the feet-lock pipe was proposed. Then, based on the proposed mechanical model, the analytical equations for predicting the vertical load and settlement at the foot of the steel rib were derived using structural analysis and beam theory on elastic foundation. The predicted vertical loads and settlements were validated by comparing with the results of field measurements and the Winkler foundation beam model for the feet-lock pipe, and the results show that the feet-lock pipe can effectively reduce the load acting on the ground, where the steel rib was installed, and finally improve the stability of the tunnel structure.

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Section: Eoretical Predictionmentioning

confidence: 99%

mentioning

confidence: 99%

Vertical Load and Settlement at the Foot of Steel Rib with the Support of Feet‐Lock Pipe in Soft Ground Tunnel

Chen

Luo

et al. 2019

Advances in Civil Engineering

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“…And their research gave some references for other similar projects. Fang et al 21 analyzed the settlement of the existing tunnel and the ground surface while the new twin tunnels were excavated by the shallow tunneling method and found that the settlement profile of the existing structure displays a ''w'' shape, while the ground surface settlement profile displays a ''u'' shape.…”

Section: Introductionmentioning

confidence: 99%

Study on the settlement of large-span metro station’s baseplate caused by the tunnels newly built beneath it

Huo

Zhou

Song

et al. 2019

Advances in Mechanical Engineering

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The influence of tunnel excavation on adjacent buildings or structures must be considered when new tunnels pass through existing buildings or structures. In this article, based on the project of the Aotidong-Aotizhongxin section of Shenyang Metro Line 9 passing through the existing Aotizhongxin station of Line 2, the numerical simulation was employed to research the settlement laws of the existing station's baseplate by four methods, namely the full-face excavation method, the benching tunneling method, the side heading method, and the center diaphragm (CD) method. Based on the results of numerical calculations, in order to ensure the safe and normal operation of existing station, it was recommended to use the CD method to construct the new tunnels. At the same time, the advanced deep hole grouting reinforcement technology and jack-up technology should be adopted in the process to reduce settlement of the station's baseplate. The CD method proved applicability in the project by comparing the field-monitoring data with the numerical calculation results. The results can provide reference for the design and construction of similar projects 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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Effects of twin tunnels construction beneath existing shield-driven twin tunnels

Cited by 160 publications

References 25 publications

Vertical Load and Settlement at the Foot of Steel Rib with the Support of Feet‐Lock Pipe in Soft Ground Tunnel

Vertical Load and Settlement at the Foot of Steel Rib with the Support of Feet‐Lock Pipe in Soft Ground Tunnel

Study on the settlement of large-span metro station’s baseplate caused by the tunnels newly built beneath it

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

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