Interpretation of displacement monitoring data for tunnels in

Schubert, Wulf; Grossauer, Karl; Button, Edward Alan

doi:10.1016/j.ijrmms.2003.12.126

Cited by 2 publications

(2 citation statements)

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“…Isolated blocks within the excavation area may contribute to the stability of the tunnel face but only temporarily affect the overall stability of the tunnel. Assessment of displacement monitoring data, such as displacement vector maps, time histories, deflections, and trend lines [103][104][105][106], indicates that displacement magnitudes generally increase with a decrease in the block volume ratio.…”

Section: Tunnel Engineeringmentioning

confidence: 99%

Research Progress on the Geomechanical Properties of Block-in-Matrix Rocks

Guo,

Wei,

et al. 2024

Materials

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The differences in geomechanical properties and the uncertainty in the spatial distribution of Bimrock pose significant challenges to the construction and disaster prediction of geotechnical engineering. To clarify the geomechanical characteristics of Bimrock, this paper summarizes the basic concepts and classification methods of Bimrock at home and abroad. It discusses the methods and characteristics of determining the geometric features of Bimrock blocks and explores the influencing factors and laws of failure modes and strength under different stress states of Bimrock. The study finds that the failure mode of Bimrock is mainly influenced by factors such as block proportion, degree of welding between blocks and matrix, strength ratio between blocks and matrix, and geometric properties of blocks. Among these factors, block proportion is the most significant, and the degree of welding is a controlling factor. However, due to the complexity of Bimrock structures, there is a lack of applicable methods and mechanical models for the evaluation of geomechanical characteristics of Bimrock in engineering practice. This article also explores the influence and research methods of the geological characteristics of Bimrock in slope and tunnel engineering and, finally, provides prospects for the future research trends relating to Bimrock.

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Section: Tunnel Engineeringmentioning

confidence: 99%

Research Progress on the Geomechanical Properties of Block-in-Matrix Rocks

Guo,

Wei,

et al. 2024

Materials

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“…Asymmetric deformations of the tunnel walls have been observed on tunnels in structured rock masses, such as phyllites and slates. For instance, asymmetric radial displacements at the tunnel wall, horizontal displacements at the crown and axial displacements at the springline are often measured on the shotcrete support of NATM tunnels in anisotropic rock masses (Schubert & Budil, 1995;Goricki et al, 2005;Schubert et al, 2005;Schubert & Moritz, 2011;Klopcic & Logar, 2014;Lenz et al, 2017). Those asymmetric deformations are commonly associated with the anisotropic properties of the rock mass and with localized heterogeneities.…”

Section: Introductionmentioning

confidence: 99%

Tunnel Misalignment with Geostatic Principal Stress Directions in Anisotropic Rock Masses

Vitali¹,

Celestino²,

Bobet³

2020

S&R

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Rock masses may present pronounced stress anisotropy, and so it is likely that a tunnel is misaligned with the geostatic principal stress directions. As a consequence, anti-symmetric axial displacements and axial shear stresses are induced around the tunnel due to the presence of far-field axial shear stresses. Limited research has been conducted on the effects of far-field axial shear stresses on tunnel behavior. This paper investigates the effects of tunnel misalignment with the geostatic principal stresses in anisotropic rock masses. 3D FEM modeling of a tunnel misaligned 45°with the principal horizontal stresses is conducted. An anisotropic geostatic stress field is considered, with the major horizontal stress two times larger than the vertical stress and the minor horizontal stress equal to the vertical stress. The anisotropic behavior of the rock mass is represented by a transversely anisotropic elastic model, with properties typical of anisotropic rock masses. Tunnels in horizontally and vertically-structured rock masses are assessed. Unsupported and supported tunnels are investigated. The results show that asymmetric deformations and asymmetric stresses are induced near the face of the tunnel as a result of the tunnel misalignment with the geostatic principal stresses and with the rock mass structure. These asymmetric deformations near the face affect the ground-support interaction such that the internal forces in the liner are also asymmetric.

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Interpretation of displacement monitoring data for tunnels in

Cited by 2 publications

References 0 publications

Research Progress on the Geomechanical Properties of Block-in-Matrix Rocks

Research Progress on the Geomechanical Properties of Block-in-Matrix Rocks

Tunnel Misalignment with Geostatic Principal Stress Directions in Anisotropic Rock Masses

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