Influence of tunnelling on the deformation of the overlying excavation bracing system and analysis of countermeasures

Dai, Xuezhi; Cai, Jun; Diao, Yu; Huo, Haifeng; Xu, Guangcai

doi:10.1016/j.compgeo.2021.104089

Cited by 18 publications

(3 citation statements)

References 54 publications

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“…Similarly, when the right tunnel is excavated, the additional stress at the tower base can also be calculated according to equation (17). It should be noted that when calculating the induced stress caused by the excavation of the right tunnel, it is necessary to accurately calculate the l A and l B values according to the geometric relationship shown in Figure 7.…”

Section: Teoretical Solution Of Induced Stress Caused By Cavernmentioning

confidence: 99%

“…Yang et al [16] used three-dimensional fnite element to study the infuence of tunnel excavation on pile foundation settlement. Considering the small-strain stifness hardened soil model, Dai et al [17] analyzed the infuence of tunnel excavation on the deformation of the structure and horizontal support plate in the upper foundation pit through three-dimensional fnite element simulation. Liu et al [18] took a subway shield tunneling under the existing tunnel in Zhengzhou as the research object, used the fnite diference software to simulate the surrounding soil settlement caused by shield tunneling, and analyzed the internal force changes of the existing upgoing subway tunnel caused by shield tunneling.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Small Clear-Distance Tunnel Construction on Adjacent High-Voltage Transmission Tower Foundation

Yao¹,

Lin²,

Ren³

2023

Advances in Civil Engineering

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The new tunnel construction will inevitably cause the change of the stress field and displacement field of the stratum where the adjacent existing structures are located, which poses a great threat to the safe and stable operation of the existing structures. Reasonable selection and optimization of construction sequence and construction method of double tunnels with small clear distance are of great significance to the safe and stable operation of existing structures. In this present study, taking the Xiaohan municipal double-arch highway tunnel near the high-voltage transmission tower as the engineering background, the ABQUS finite element numerical simulation method is used to analyze the influence of tunnel construction on the existing high voltage tower foundation. The accuracy of the numerical method is verified compared with the theoretical solution of induced stress at the bottom of the tower foundation caused by the excavation of circular cavity. Then, the influence law of tunnel position on induced stress field is discussed by parameter analysis. On this basis, the construction sequence which has the least influence on the tower foundation is selected by comparing the numerical simulation results of different construction schemes. That is, the left tunnel shall be excavated after the construction of the right tunnel is completed. Finally, the change of the settlement of the existing tower foundation, the stress of the base, and the inclination degree during the CD method excavation is analyzed. The results show that simultaneous excavation of new tunnels has the greatest influence on the settlement and stress increment of the existing tower foundation. It provides suggestions to construct the double tunnels step by step from far side to near side in similar projects.

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Section: Teoretical Solution Of Induced Stress Caused By Cavernmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of Small Clear-Distance Tunnel Construction on Adjacent High-Voltage Transmission Tower Foundation

Yao¹,

Lin²,

Ren³

2023

Advances in Civil Engineering

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show abstract

“…The Mohr-Coulomb elastic-plastic soil constitutive model is adopted for the numerical simulation of the soil. As a classical constitutive model, it can well describe the failure mode and deformation behavior of the soil [28][29][30]. Table 2 shows the physical and mechanical parameters of soil within the influence range of shield tunnel excavation.…”

Section: Three-dimensional Finite Element Analysis Model Of Shield Tu...mentioning

confidence: 99%

Laws and Numerical Analysis of Surface Deformation Caused by Excavation of Large Diameter Slurry Shield in Upper-Soft and Lower-Hard Composite Stratum

et al. 2022

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Due to the large cross-section design of large-diameter shield tunnels, most of the rocks and soils it crosses are composite strata with upper soft and lower hard. In order to reduce the construction cost of shield working shafts, large-diameter shield launching is usually buried at a shallow depth. Based on the typical large-diameter slurry shield tunnel, the following research results were obtained according to field monitoring and PLAXIS 3D finite element simulation. (1) The electronic level is used to monitor the surface settlement, and the field monitoring data were obtained; the surface settlement duration curve at the axis of the shield tunnel during the construction period can be divided into four stages: pre-deformation, shield passing, shield tail exit and shield moving away, of which the surface settlement accounts for the largest proportion during the shield passing. (2) In order to ensure the accuracy of the numerical simulation results, the linear shrinkage of the shield needs to be considered in the modeling. (3) The maximum surface settlement value at the center of the tunnel increases with the increase of the support pressure; when the support pressure exceeds 300 kPa, the surface uplift and the settlement caused by the formation loss will offset, and the surface settlement will decrease instead. The maximum surface settlement value is inversely proportional to the grouting pressure, but with the increase of the grouting pressure, the maximum uplift of the surface continues to increase. (4) With the numerical simulation of excavation step construction, the surface uplift increases with the increase of grouting pressure and shield radius, and decreases with the increase of shield buried depth.

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Response Characteristics and Anti-floating Structure Optimization Analysis of Metro Tunnel in Water Rich Stratum

Li,

et al. 2024

KSCE J Civ Eng

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Influence of tunnelling on the deformation of the overlying excavation bracing system and analysis of countermeasures

Cited by 18 publications

References 54 publications

The Influence of Small Clear-Distance Tunnel Construction on Adjacent High-Voltage Transmission Tower Foundation

The Influence of Small Clear-Distance Tunnel Construction on Adjacent High-Voltage Transmission Tower Foundation

Laws and Numerical Analysis of Surface Deformation Caused by Excavation of Large Diameter Slurry Shield in Upper-Soft and Lower-Hard Composite Stratum

Response Characteristics and Anti-floating Structure Optimization Analysis of Metro Tunnel in Water Rich Stratum

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