Zonal disintegration of rock mass around an underground excavation

Mirenkov, V. E.

doi:10.1134/s1062739114010050

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…Te stability of rock slopes and tunnels is mainly afected by factors such as rainfall [5], earthquakes [6,7], geological structures (such as folds, discontinuities, and faults) [8,9]. Te unloading and blasting performed during the excavation process directly reduce the integrity of the rock mass, which leads to fractures and cracks in the weak structural plane [10]. Te weak structural surfaces signifcantly afect the stabilization of rock slopes [11].…”

Section: Introductionmentioning

confidence: 99%

Long-Term Effect Analysis of a High Slope with Tunnel Structure Based on Three-Dimensional Mesh Reconstruction

Shi

Yuan

Che

et al. 2023

Advances in Civil Engineering

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The instability of high rock slopes with tunnel structures increases under the effects of earthquakes and rainfall. Limited studies have been conducted on the long-term effect analysis of high rock slopes with tunnels. Field electrical measurements on rock slopes have been conducted to study the response of high rock slopes with large cross-section tunnels during rainfall and seismic loading. The material threshold was determined using the resistivity probability density statistical method, and a three-dimensional geological visualization model was obtained. A three-dimensional mesh reconstruction method consisting of material segmentation, cluster filtering, mesh generation, and material attribute mapping modules was proposed. The three-dimensional model of high-cutting rock slope was reconstructed, and the three-dimensional finite element model of the rock slope with tunnel was obtained. The response analysis of the slope was performed during rainfall and seismic loading by employing the El-Centro wave. The results demonstrated that plastic strain was generated in the fracture zone of the upper part of the tunnel during rainfall, and the strain value was 8.135 × 10−4. In the subsequent stages, it had a tendency to expand into the tunnel under continuous rainfall. The maximum principal strain was 3.324 × 10−2 under the effect of a strong earthquake. A large strain was generated in the fracture zone at the upper part of the tunnel. It had a tendency to expand under long-term load, which significantly affected the safety of the tunnel.

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Section: Introductionmentioning

confidence: 99%

Long-Term Effect Analysis of a High Slope with Tunnel Structure Based on Three-Dimensional Mesh Reconstruction

Shi

Yuan

Che

et al. 2023

Advances in Civil Engineering

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“…In order to understand the formation mechanism and distribution law of zonal disintegration, domestic and foreign experts have conducted a considerable amount of research in this field. In foreign countries, the authors in [4] thought that the mechanism of fracture of deep roadway surrounding rock under unloading conditions is similar to the formation of the penetrating crack of the test specimen under lateral pressure conditions; the authors in [5] studied the deformation failure of the defective medium and the zonal disintegration of the surrounding rock in a deep roadway using non-Euclidean geometry; Metlov et al [6] analyzed the zonal rock failure of the surrounding rock based on a nonequilibrium thermodynamics view; Mirenkov [7] pointed out that the shear stress around the hole increased at the position of o times excavation radius; and Qi et al [8] established the strain gradient equation for the zonal disintegration of surrounding rock in deep underground caves. In China, Bai [9] first discovered a very interesting engineering problem, the zonal disintegration of surrounding rock, by field monitoring the stress state of the bolt body.…”

Section: Introductionmentioning

confidence: 99%

Space‐Time Evolution Laws of Zonal Disintegration in Deep Underground Caves Based on Coordination Deformation between the Bolt Body and Surrounding Rock

Yuanxiang

Xie

Chen

2021

Advances in Civil Engineering

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Zonal disintegration refers to the special phenomenon whereby fractured zones and intact zones appear alternately in deep-buried surrounding rocks under high stress conditions, which are different from that of the shallow rock mass. Because the divisional rupture law in engineering practice is closely related to the force characteristics of the bolt body, this paper analyzed stress distribution rules of the same bolt body at different times and that of different bolt bodies at the same time in the case of zonal disintegration based on coordination deformation between the bolt body and surrounding rock. The nonlinear rheological mechanics model of rock mass on the elastic-plastic interface under the maximum support pressure was established. It puts forward the theoretical calculation formula about the mechanics criterion and breakdown moment of the zonal disintegration. Using the mechanics model of interaction between a bolt and the surrounding rock, the distribution locations along the bolt body of the anchor neutral points and its maximum axial forces were discussed with the multiple theoretical neutral points. Furthermore, the location and width of each fracture zone were back analyzed. The results show that the rock mass on the elastic-plastic interface of the surrounding rock has a significant creep effect after the excavation of the deep underground cave. While maximum deviator stress of the rock mass is more than its long-term strength, the rock mass will fracture along a radial direction and come into the fractured zone. The multiple redistribution of the surrounding rock stress will generate alternate distribution phenomena of the fractured zone and intact zone. Meanwhile, the distribution regularity of the peaks and troughs interval of the displacement of surrounding rock leads to multiple neutral points along the anchor length direction. The computed results of zonal disintegration through the back analysis can reflect the actual space-time evolution laws of zonal disintegration in deep underground caves.

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“…A new strength criterion for deep rock mass was derived by Zhang and Zhang (2011) based on fracture mechanics. A mathematical model of zonal disintegration of rocks around a deep-level excavation was developed by Mirenkov (2014). Reuter et al (2015) described a model for rock failure around breakage headings in coal mines based on the 2-D problem from the theory of creep with finite strains.…”

Section: Introductionmentioning

confidence: 99%

Zonal disintegration test of deep tunnel under plane strain conditions

Tian

Tang

Liu

et al. 2020

Int J Coal Sci Technol

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To investigate the zonal disintegration form of the surrounding rock in deep tunnels, model tests were performed in the simulation set-up of fracture mechanism and support technology of surrounding rock in deep tunnel. The test results illustrate that the first fracture of the surrounding rock occurred at the intersection of the tunnel floor and the side wall. After more serious destruction, the side wall and the vault were destroyed. Although the fracture width of each surrounding rock mass was distinct, they were relatively uniform with a nearly continuous fracture form. The width of the split bodies of the model tunnels (i.e., the annular zonal disintegration area) developed with an increasing load. It was observed from the fitting curves of the data that all radial strain values of the surrounding rock were more symmetric with a smooth fitting curve, and the maximum value occurred near the tunnel wall before reducing instantly. The circumferential strain values were dispersed and the data were inconsistent with the fitting curve, which caused some data to be unreliable. The phenomenon of zonal disintegration was primarily caused by radial tension strain of the surrounding rock. This phenomenon would not extend indefinitely as the rupture range would be limited to a certain extent, because the maximum radial tension strain of the surrounding rock was less than the limiting value.

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Zonal disintegration of rock mass around an underground excavation

Cited by 10 publications

References 2 publications

Long-Term Effect Analysis of a High Slope with Tunnel Structure Based on Three-Dimensional Mesh Reconstruction

Long-Term Effect Analysis of a High Slope with Tunnel Structure Based on Three-Dimensional Mesh Reconstruction

Space‐Time Evolution Laws of Zonal Disintegration in Deep Underground Caves Based on Coordination Deformation between the Bolt Body and Surrounding Rock

Zonal disintegration test of deep tunnel under plane strain conditions

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