Ground and tunnel responses induced by partial leakage in saturated clay with anisotropic permeability

Zhang, D.M.; Ma, Limin; Zhang, J.; Hicher, Pierre‐Yves; Juang, C. Hsein

doi:10.1016/j.enggeo.2015.02.005

Cited by 100 publications

(10 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Field measurements reveal that the permeability in the horizontal direction could be several times that of the vertical direction (Kenney 1963;Head 1988;Jeng et al 2001;Hazelton and Murphy 2007). Zhang et al (2015) reported that anisotropic soil permeability can significantly affect the distribution of pore water pressure and earth pressure along tunnel working surfaces and linings, indicating that the existing assumption of isotropic soil permeability is inadequate for calculating the forces and deformation of geo-structures.…”

Section: Introductionmentioning

confidence: 99%

Active earth pressure acting on retaining wall considering anisotropic seepage effect

Yang

Wilkinson

2017

J. Mt. Sci.

View full text Add to dashboard Cite

This paper presents a general solution for active earth pressure acting on a vertical retaining wall with a drainage system along the soil-structure interface. The backfill has a horizontal surface and is composed of cohesionless and fully saturated sand with anisotropic permeability along the vertical and horizontal directions. The extremely unfavourable seepage flow on the back of the retaining wall due to heavy rainfall or other causes will dramatically increase the active earth pressure acting on the retaining walls, increasing the probability of instability. In this paper, an analytical solution to the Laplace differential governing equation is presented for seepage problems considering anisotropic permeability based on Fourier series expansion method. A good correlation is observed between this and the seepage forces along a planar surface generated via finite element analysis. The active earth pressure is calculated using Coulomb's earth pressure theory based on the calculated pore water pressures. The obtained solutions can be degenerated into Coulomb's formula when no seepage exists in the backfill. A parametric study on the influence of the degree of anisotropy in seepage flow on the distribution of active earth pressure behind the wall is conducted by varying ratios of permeability coefficients in the vertical and horizontal directions, showing that anisotropic seepage flow has a prominent impact on active earth pressure distribution. Other factors such as effective internal friction angle of soils and soil/wall friction conditions are also considered.

show abstract

Section: Introductionmentioning

confidence: 99%

Active earth pressure acting on retaining wall considering anisotropic seepage effect

Yang

Wilkinson

2017

J. Mt. Sci.

View full text Add to dashboard Cite

show abstract

“…In the engineering design stage, due to the lack of profound understanding of the spatial variability of rock geological materials, engineers often cannot anticipate the potential hazards in underground engineering well. Therefore, how to analyze and evaluate the randomness of rock parameters reasonably is of great significance to the stability analysis of underground cavern engineering [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Diversion Tunnel Excavation Using GPU-Accelerated Anisotropic Random Fields

Zhu

Cui

et al. 2023

Geofluids

View full text Add to dashboard Cite

In this study, a combined anisotropic random field and GPU-accelerated Cholesky decomposition algorithm is proposed for diversion tunnel excavation. With the MATLAB programming control be used to combine the advantages of GPU and CPU computing, the efficient method of generating large numerical model random fields is realized. Based on the geological structure characteristics of red-layered soft rocks in central Yunnan, the anisotropic rock random field and tunnel excavation with different rotation angles are simulated. The results show that the variability of rotational anisotropy random fields and mechanical parameters of the red-bedded soft rocks in central Yunnan has a large influence on the deformation and stress state of the surrounding rocks at the excavation face of the tunnel. This study can provide theoretical and technical support for the design and construction of relevant rock engineering in the red-layered soft rock area in central Yunnan.

show abstract

“…The importance of tunnel cover thickness, among other related factors such as lining joint pattern [25], tunnel face lagging distance [26], soil permeability [27], dynamic disturbance [28,29], and time effect [30], has an essential effect on the tunnel stability.…”

Section: Introductionmentioning

confidence: 99%

Stability of Shield-Bored Tunnel for the Challenge of Nile Crossing

Elgamal

Elfaris²

2021

Infrastructures

View full text Add to dashboard Cite

Underwater tunnel structures are vital in urban areas, and their use is continuously increasing. The engineering assessments for these impressive phenomena have to be performed from both geotechnical and structural engineering perspectives. The designer should take account of the requirements of the underwater structures to adequately withstand different applied loads. The underwater tunnel might be particularly vulnerable at locations where the geological conditions are uncertain. This study will cover all aspects concerning the stability of the tunnel crossing of the River Nile. The protentional exists for the tunnel failure during construction due to insufficient cover thickness and after construction due to a combination of long-term degradation and local scour. There were no imposed constraints on the alignment and the original design with a cover between the tunnel crown and the riverbed of at least one tunnel diameter. The tunnel stability was analyzed based on the most critical underwater section with a minimum cover thickness of the Greater Cairo Metro, Line 2 as the case study. Then, three-dimensional (3D) numerical analysis based on the Finite Element (F.E.) models was employed to explore soil–tunnel interactions. Comparison between numerical models’ results indicated that the safe cover thickness was equal to the tunnel diameter. The minimum cover thickness can be used to verify the required factor of safety calculated by theoretical analysis. The safety factor of the tunnel stability should not be less than 1.5 for construction and service stages and 1.3 for the exceptional case; scour accrues.

show abstract

Ground and tunnel responses induced by partial leakage in saturated clay with anisotropic permeability

Cited by 100 publications

References 29 publications

Active earth pressure acting on retaining wall considering anisotropic seepage effect

Active earth pressure acting on retaining wall considering anisotropic seepage effect

Numerical Simulation of Diversion Tunnel Excavation Using GPU-Accelerated Anisotropic Random Fields

Stability of Shield-Bored Tunnel for the Challenge of Nile Crossing

Contact Info

Product

Resources

About