Face stability of a tunnel excavated in saturated nonhomogeneous soils

Zou, Jinfeng; Qian, Ze-Hang; Xiang, Xin-hai; Chen, Guang hui

doi:10.1016/j.tust.2018.09.007

Cited by 72 publications

(18 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e construction period of metro is long, and the interruption of traffic should be avoided as far as possible when crossing the road. With the advantages of fast construction speed and small disturbance to stratum, shield tunneling is becoming the preferred construction scheme for metro construction [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

The Environmental Effects Induced by a Metro Shield Tunnel Side‐Crossing on Adjacent Pile Foundations and Its Impact Partition

Zhang

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

With the advantages of fast construction speed and small disturbance to stratum, shield tunneling is becoming the preferred construction scheme for metro construction. However, if the disturbance of stratum cannot be clearly understood, it will affect the safety of adjacent underground structures and aboveground buildings. Based on the construction of the interval tunnel between Shizishan station and Chuanshi station of Chengdu metro line 7 project, this paper proposed a simplified calculation method to analyze the impact of shield excavation on adjacent pile foundation. A two-stage method of modified Peck formula and Winkler elastic foundation model was used to investigate the additional displacement and internal force of pile. A three-dimensional numerical model validated with the field test data was performed to compare with the theoretical results. The impact factors and their impact degree were discussed. The results show that the additional displacement and internal force are at a reasonable and acceptable level. The permanent pile foundation should adopt the small diameter pile as far as possible. When the small diameter pile foundation cannot meet the stress requirements, the design scheme of the pile group should be adopted. The area around shield tunnel is divided into strong impact area of pile foundation (S ≤ 0.75 D), slight impact area (0.75 D ≤ S ≤ 1.5 D), and no impact area (S > 1.5 D). The pile researched in this paper (S = 0.83 D) is in the slight impact area.

show abstract

Section: Introductionmentioning

confidence: 99%

The Environmental Effects Induced by a Metro Shield Tunnel Side‐Crossing on Adjacent Pile Foundations and Its Impact Partition

Zhang

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…As the main artery of underground traffic in modern cities, this phenomenon of metro tunnels is particularly prominent. Among many construction methods of metro tunnel, shield tunneling is becoming the preferred construction scheme because of its advantages of fast construction and small disturbance to stratum [5][6][7][8][9]. Although shield tunneling has many advantages as mentioned above, and the construction technology has made great progress in many years, due to the defects of geological conditions and construction technology, the advance of shield tunneling will inevitably create a disturbance, change the stress state of soil and cause stratum displacement.…”

Section: Introductionmentioning

confidence: 99%

“…However, most previous studies only consider the stratum displacement caused by ground loss factors, ignoring the influence of mechanical factors without clear theoretical basis [7,8,17,21]. A few studies containing mechanical factors are not thorough enough, and they are usually shown in the form of total displacement without the quantitative analysis of the proportion of stratum displacement caused by each factor [6,9,10].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of Soil Displacement Induced by Ground Loss and Shield Machine Mechanical Effect in Metro Tunnel Construction

et al. 2019

View full text Add to dashboard Cite

In order to relieve the increasing ground traffic pressure in the process of urbanization in China, it is inevitable to build more metro lines. However, the stratum movement caused by tunneling affects the safety of adjacent underground structures and aboveground buildings. Therefore, how to evaluate and control the stratum movement is a prominent problem. In this paper, based on the engineering project of an interval tunnel between Shizishan Station and Chuanshi Station in Chengdu Metro Line 7, China, the action mechanism of stratum movement induced by shield tunneling is analyzed, and the effect factors are divided into two categories: ground loss factors and mechanical factors. Combining the advantages of Loganathan method and mirror source-sink method, a new solution of three-dimensional displacement induced by ground loss is proposed. Based on the elastic half-space Mindlin model, the displacement at any point induced by four mechanical effect factors is deduced. Finally, the total displacement is verified by field monitoring data and quantitative analyzed in various parts.

show abstract

“…A nonlinear method is needed to obtain a reliable solution since the deformation response depends on the stress path. Numerical method, elastoplastic methods, and limit analysis methods are popularly used for cavity expansion or contraction according to the existing literature surveys [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. In the past, Mohr-Coulomb failure criterion was widely used by many scholars for analysis of rock mass.…”

Section: Introductionmentioning

confidence: 99%

An Improved Stress and Strain Increment Approaches for Circular Tunnel in Strain-Softening Surrounding Rock Considering Seepage Force

Wang

Zou

Sheng

2019

Advances in Materials Science and Engineering

Self Cite

View full text Add to dashboard Cite

Considering the effect of seepage force, a dimensionless approach was introduced to improve the stress and strain increment approach on the stresses and radial displacement around a circular tunnel excavated in a strain-softening generalized Hoek–Brown or Mohr–Coulomb rock mass. The circular tunnel can be simplified as axisymmetric problem, and the plastic zone was divided into a finite number of concentric rings which satisfy the equilibrium and compatibility equations. Increments of stresses and strains for each ring were obtained by solving the equilibrium and compatibility equations. Then, the stresses and displacements in softening zone can be calculated. The correctness and reliability of the proposed approach were performed by the existing solutions.

show abstract

Face stability of a tunnel excavated in saturated nonhomogeneous soils

Cited by 72 publications

References 34 publications

The Environmental Effects Induced by a Metro Shield Tunnel Side‐Crossing on Adjacent Pile Foundations and Its Impact Partition

The Environmental Effects Induced by a Metro Shield Tunnel Side‐Crossing on Adjacent Pile Foundations and Its Impact Partition

Quantitative Analysis of Soil Displacement Induced by Ground Loss and Shield Machine Mechanical Effect in Metro Tunnel Construction

An Improved Stress and Strain Increment Approaches for Circular Tunnel in Strain-Softening Surrounding Rock Considering Seepage Force

Contact Info

Product

Resources

About