Face-Stability Analysis of Tunnels Excavated below Groundwater Considering Coupled Flow Deformation

Zou, Jinfeng; Qian, Ze-Hang

doi:10.1061/(asce)gm.1943-5622.0001199

Cited by 52 publications

(7 citation statements)

References 32 publications

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“…FLAC3D is a type of simulation software developed by the ITASCA of America and is widely used in rock and soil mechanics calculation [10][11][12]. Since it comprises 11 kinds of original constitutive models of elastoplastic materials, such as seepage, static, creep, dynamic, and temperature calculation models, it is appropriate for many scientific research fields like geotechnical engineering, geological engineering, and mining engineering [13][14][15]. Furthermore, it can get the accurate data and graph of stress, displacement, and plastic zone after caving and filling.…”

Section: Accurate Finite Element Model and Simulation Schemesmentioning

confidence: 99%

Optimization of Stope Structural Parameters Based on Mathews Stability Graph Probability Model

Zhang

Wang³

et al. 2018

Advances in Civil Engineering

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Strip mining with subsequent filling is one of the main mining methods for gently inclined thin ore bodies. The production process of excavating alternate strips is beneficial to the safety of mining. Reasonable stope structural parameters are key to achieving safe and efficient mining. The Tiaoshuihe phosphate mine of Sanning Mining is taken as an example in this study. Based on precision finite element modeling and simulation, a reasonable width range and the interval value of the strip are determined. A reliable and efficient strip width is calculated by using the probability model of the improved Mathews stability graph method. The results show the following. Firstly, under the geological conditions and backfill environment of the Tiaoshuihe phosphate mine, the reasonable and safe strip width interval is 7–9 m. Secondly, the probabilities of open stope stability with strip widths of 7, 8, and 9 m are 88.55%, 86.76%, and 84.94%, respectively. The reasonable probabilities of stope stability with strip widths of 7 and 8 m are higher than 85%. Thirdly, combining this with the drilling equipment operation parameters, it is suggested that the best strip width is 7 m without increasing the strength of the backfill.

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Section: Accurate Finite Element Model and Simulation Schemesmentioning

confidence: 99%

Optimization of Stope Structural Parameters Based on Mathews Stability Graph Probability Model

Zhang

Wang³

et al. 2018

Advances in Civil Engineering

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“…Alternatively, analytical solutions based on the limit analysis method have developed rapidly owing to their accuracy and efficiency. For illustration, a "spatial discretization point-by-point technology" [8] was proposed, and many researchers [9][10][11][12] have employed this method to scrutinize various factors influencing tunnel face stability. Man et al [13][14][15] studied the stability of tunnel faces in excavation sections where the rock mass often exhibits stratified characteristics.…”

Section: Introductionmentioning

confidence: 99%

A fast and automatic establishment method of the calculation formula for the tunnel face safety factor based on analytical solution

Man,

Huang,

Chen

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Assessing rock tunnel face stability when constructing mountain tunnels is of utmost importance because it is influenced by various factors, including the tunnel diameter, depth, excavation dimension, geological strength index, uniaxial compressive strength, and Hoek-Brown constant. This study established a tunnel face stability database based on analytical solutions that considered the correlation between the influencing parameters. Finally, a safety factor prediction equation was constructed by combining response surface methodology and the multivariate adaptive regression spline algorithm. The results of this study find applications at construction sites and provide a reference for the rapid evaluation of rock tunnel faces during construction.

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“…However, due to the increase in the number of tunnels, it is inevitable that there will be spatial overlapping of tunnels, in which the lower part of new tunnels passes through the existing tunnels, which is a commonly used method in the project [4][5][6][7]. The excavation of new tunnels not only induces stress redistribution in the surrounding rock strata but also generates additional stresses, settlement deformations, and additional vibrations on the existing tunnels, resulting in the deterioration of the mechanical properties of the existing tunnel structures within a certain range of the underpass area [8][9][10]. When the clear distance between the cross-section tunnels is small, there is an overlapping influence area between the excavation of the new tunnel and the train operation in the existing tunnel, which can lead to further deterioration of the mechanical properties of the surrounding rock [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Influence Area of the Excavation of a Double-Line Highway Tunnel under an Existing Railway Tunnel

Li,

Huang,

et al. 2023

Applied Sciences

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The research on the impact of the excavation of underpass tunnels has already had certain results, but there is a lack of research cases of double-line highway tunnels with oblique angles under the existing railway tunnels, especially the method of determining the area of the impact of the dynamic and static loads of new tunnels and existing trains, which can be enriched by considering them at the same time. This paper, is based on the tunnel project of the new double-line Shiqian highway tunnel with oblique angles under the Hurong railway in Wanshoushan. By constructing a three-dimensional finite element model and simulating the application of static tunnel excavation load, dynamic blasting load, and dynamic train operation load of the existing tunnel, the overall displacement of the existing tunnel and the settlement value of the bottom plate of the track surface by the static tunnel excavation load were analyzed. Then, the stresses, vibration speeds, and displacements of the tunnel due to the dynamic blasting loads and the dynamic train operation loads were obtained. The results show that the area of influence of the static loads of the new tunnel excavation on the existing tunnel is divided into three types of perturbations presenting strong, weak, and slight; the area affected by the blasting dynamic load of new tunnel excavation is a circular domain with the datum point in the tunnel section as the center; the area affected by the dynamic load of train operation in the existing tunnel is an ellipse with the center of the track surface of the existing tunnel as the datum; and there is an anomalous shape in the area affected by the blasting dynamic load of new tunnel excavation and the area affected by the dynamic load of the train operation in the existing tunnel.

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Face-Stability Analysis of Tunnels Excavated below Groundwater Considering Coupled Flow Deformation

Cited by 52 publications

References 32 publications

Optimization of Stope Structural Parameters Based on Mathews Stability Graph Probability Model

Optimization of Stope Structural Parameters Based on Mathews Stability Graph Probability Model

A fast and automatic establishment method of the calculation formula for the tunnel face safety factor based on analytical solution

Investigation of the Influence Area of the Excavation of a Double-Line Highway Tunnel under an Existing Railway Tunnel

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