Analytical model for tunnel face stability in longitudinally inclined layered rock masses with weak interlayer

Man, Jianhong; Huang, Hongwei; Ai, Zhi Yong; Chen, Jiayao

doi:10.1016/j.compgeo.2021.104608

Cited by 24 publications

(10 citation statements)

References 55 publications

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“…Zhang et al put forward the concept of critical explosion energy and believed that when the sum of explosion energy produced by various factors is less than the critical explosion energy, the dynamic response is mainly affected by the internal structure of the slope 26 . Man et al found that the instability of the tunnel face is significantly aggravated by the weak interlayer, and the position and thickness of the weak interlayer also have a certain impact on the stability of the tunnel face 27 .…”

Section: Introductionmentioning

confidence: 99%

Study on blasting characteristics of rock mass with weak interlayer based on energy field

Cui

Xie

Qiao

et al. 2022

Sci Rep

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In order to explore the influence of weak interlayer on blasting characteristics in natural rock mass, by using the particle flow code (PFC2D), a single hole blasting numerical model of hard rock with soft interlayer is established. The blasting experiments at different positions and thicknesses of weak interlayer are carried out. Then an in-depth analysis from the perspectives of crack effect, stress field and energy field is made. Results showed that: (i) When the explosion is initiated outside the weak interlayer, if the interlayer is located within about twice the radius of the crushing area, the closer the interlayer is to the blast hole, the higher the damage degree of the rock mass around the blast hole. And the number of cracks will increase by about 1–2% when the distance between the weak interlayer and the blast hole decreases by 0.5 m. (ii) When detonating outside the weak interlayer, if the interlayer is within about 4 times radius of the crushing area, the hard rock on both sides of the weak interlayer will in a high stress state. Under the same case, the peak kinetic energy and peak friction energy will increase by about 23 and 13%, respectively, and the peak strain energy will increase by about 218 kJ for every 0.1 m increase in the thickness of the weak interlayer.

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Section: Introductionmentioning

confidence: 99%

Study on blasting characteristics of rock mass with weak interlayer based on energy field

Cui

Xie

Qiao

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…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. The above studies have significantly advanced tunnel face stability assessment.…”

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.

Self Cite

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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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“…Those problems have been analyzed and summarized by researchers and engineers, e.g., the classification and failure mechanism of the surrounding rock by observing and monitoring the mechanical indicators and anomaly phenomena of the surrounding rock during the tunnel construction process. The calculation formulas of the surrounding rock pressure and the stress-strain relationship of the surrounding rock are established via some idealized assumptions (Bai et al, 2019;Zhong and Yang, 2020;Hou et al, 2022;Man et al, 2022;Xue et al, 2023a). The changes in the mechanical state inside the surrounding rock during the construction process of the tunnel and underground engineering are very complicated to be recognized.…”

Section: Introductionmentioning

confidence: 99%

The construction stability of large section tunnel considering the deterioration of clay mechanical properties

Huang

Liu

Ma³

et al. 2023

Front. Mater.

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The stability of large-section clay tunnels is closely related to the mechanical behavior of the surrounding rock. The mechanical behavior of the surrounding rock is characterized by the coupled response of the physico-mechanical properties of the clay material and the tunnel construction conditions. Therefore, this paper proposes a numerical experimental study based on the response surface method to quantitatively link the stability of large-section clay tunnels with construction factors. It will provide a basis for quantitatively guiding the tunnel construction plan adjustment to ensure its stability. Firstly, the tunnel stability reserve is evaluated by considering the deterioration of physico-mechanical properties of clay surrounding rocks, and the relationship between the tunnel stability index and construction factors is established according to Taylor’s theorem. Secondly, the response surface method and the steepest ascent method are used to find the optimal fitting relationship between the tunnel stability reserve factor and tunnel construction factors. Finally, the analysis of a tunnel application shows that (a) the stability evaluation considering the deterioration of physical and mechanical properties of clay is well representative; (b) the “curved” region of the response of the tunnel stability reserve factor can be effectively determined by the steepest slope method; (c) for the “curved” region, a second-order response surface is more appropriate. This research will reveal the coupling relationship between tunnel stability, physico-mechanical properties of clay, and tunnel construction conditions, which will contribute to the development of intelligent tunnel construction.

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Analytical model for tunnel face stability in longitudinally inclined layered rock masses with weak interlayer

Cited by 24 publications

References 55 publications

Study on blasting characteristics of rock mass with weak interlayer based on energy field

Study on blasting characteristics of rock mass with weak interlayer based on energy field

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

The construction stability of large section tunnel considering the deterioration of clay mechanical properties

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