Determination of longitudinal convergence profile considering effect of soil strength parameters

Sadeghiyan, Rasoul; Hashemi, Mahmoud; Moloudi, Ehsan

doi:10.1016/j.ijrmms.2015.10.011

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…In tunneling, creep behavior emerges as the ongoing increase of the radial displacements observed in the tunnel surface [9]. e longitudinal deformation profile (LDP) or the deformation history for a point located on tunnel wall is similar to a sigmoid (S-type) curve [7,9,24]. Especially, for the circular tunnel in a hydrostatic in situ stress field, the radial displacement of a point located on the periphery ahead of the face occurs from distance approximately equal to 2 times of tunnel diameter as shown in Figure 1.…”

Section: Deformation Characteristics Of Rock Massmentioning

confidence: 99%

Prediction of Final Displacement of Tunnels in Time-Dependent Rock Mass Based on the Nonequidistant Grey Verhulst Model

Han¹,

Choe²,

Hong³

et al. 2022

Mathematical Problems in Engineering

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Time-dependent deformations of rock are important factors for the design and construction of tunnels in the rock masses with time-dependent strength and deformation properties. Therefore, determination displacement and stable time of tunnel are an indispensable task in geotechnical engineering, especially during the design and construction of underground structures. However, in some types of rock masses, the tunnel displacement may increase for months or years after the excavation owing to the rheological behavior of the surrounding rock masses, which greatly influences the selection of the initial tunnel support system, the excavation layout, and the determination of its load-carrying capacity. In this paper, we present a method to quickly predict the final displacement and stable time of tunnels in time-dependent rock mass using the improved nonequidistant grey Verhulst model (INGVM) with Fourier series, which is used to reduce the periodic residual error. The proposed method is validated fairly via a test for a newly excavated roadway of −600 m level in a coal mine, Democratic People’s Republic of Korea. These results are useful references for similar projects in the future.

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Section: Deformation Characteristics Of Rock Massmentioning

confidence: 99%

Prediction of Final Displacement of Tunnels in Time-Dependent Rock Mass Based on the Nonequidistant Grey Verhulst Model

Han¹,

Choe²,

Hong³

et al. 2022

Mathematical Problems in Engineering

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show abstract

“…This method has clear engineering guiding significance and is also applicable for the design of shallow tunnels [13]. Therefore, it has gradually developed into a commonly used method for tunnel structure design and tunnel excavation safety risk assessment [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, this method has unique advantages in the evaluation of the surrounding rock stability, the optimal design of the support structure, and the selection of the support time. However, in practical engineering, there are many complicated factors affecting the convergence law of the surrounding rock, such as the original stress state of the stratum, excavation and supporting conditions, and parameters of the surrounding rock [16]. Even if all the above factors have been determined, the convergence curves of surrounding rocks obtained by different constitutive models will have large errors in the calculation process [17,18].…”

Section: Introductionmentioning

confidence: 99%

Design of Tunnel Initial Support in Silty Clay Stratum Based on the Convergence-Confinement Method

Liu

Zhao

et al. 2023

Sustainability

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The stress release ratio of the surrounding rock in tunnel excavation is one of the most important indicators that affect the stress distribution and displacement of the surrounding rock. To determine the variation law of the stress release ratio of the surrounding rock during excavation in silty clay stratum, the stress release law is determined based on the convergence–confinement method (CCM) and field test data. The stress release law of the surrounding rock under support is determined based on the displacement back analysis method. The permitted displacement safety factor of silty clay under different subgrade conditions and the optimal supporting time of the initial supporting structure are determined by comparing the stress release ratio with surrounding rock displacement. The results indicated that the stress release ratio of surrounding rock in the silty clay stratum is approximately 78–90% when the coordinate displacement of the supporting structure and surrounding rock is stable under the current excavation and support conditions. For the surrounding rock of subgrade V in the silty clay stratum, the safety factor of the permitted displacement in the tunnel vault is approximately 2.91, and the initial support should be carried out within 1 m behind the face advancing. For the surrounding rock of subgrade VI1, the safety factor of the permitted displacement is 1.40, and the initial support must be carried out 1 m ahead of the tunnel face. For the surrounding rock of grade VI2, the initial support must be carried out 4 m ahead of the tunnel face.

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“…Convergence-confinement is an analytical method described by Sadeghiyan et al (2016) as a powerful tool for estimating the capacity of supports in underground excavations, the expected plastic zone extent, radial displacement, and final convergence of the opening. The method is a standard industry technique used for preliminary analysis of ground behavior after tunnel excavation.…”

Section: Introductionmentioning

confidence: 99%

Analytical and numerical assessment of a preliminary support design – a case study

et al. 2021

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Determination of longitudinal convergence profile considering effect of soil strength parameters

Cited by 9 publications

References 7 publications

Prediction of Final Displacement of Tunnels in Time-Dependent Rock Mass Based on the Nonequidistant Grey Verhulst Model

Prediction of Final Displacement of Tunnels in Time-Dependent Rock Mass Based on the Nonequidistant Grey Verhulst Model

Design of Tunnel Initial Support in Silty Clay Stratum Based on the Convergence-Confinement Method

Analytical and numerical assessment of a preliminary support design – a case study

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