Strain Gradient Model of Zonal Disintegration of Rock Mass near Deep-Level Tunnels

Qi, Chengzhi; Li, K. R.; Bai, Jiping; Чанышев, А. И.; Liu, P.

doi:10.1134/s1062739117011808

Cited by 9 publications

(7 citation statements)

References 17 publications

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“…It is worth mentioning that Figure 4 also obviously indicates that there is always a stress state of tensionpressure alternation for the same bolt body at different times or for the different bolt bodies at the same time under the condition of zonal disintegration, which has been strongly verified by field measurements and laboratory tests. e tension-pressure alternating phenomenon of a certain section of the bolt body in surrounding rock with zonal disintegration was monitored in Quantai mine by Qi et al [8], as shown in Figure 5. In addition, the radial strain of the surrounding rock in the deep cave is distributed with alternate peaks and troughs, varying in wave, which is also shown in Figure 6 [25].…”

Section: Law Of the Coordinated Deformation Of The Surroundingmentioning

confidence: 99%

“…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%

“…e full-length anchoring bolt is widely used as an effective active support technology for the surrounding rock of a deep cave. Although the stress and strain of surrounding rock are distributed alternately in waves and troughs, as pointed out in the literature [3,20,21], and the actual stress state of the pull-pressure alternation was emphasized in [8] on the condition of zonal disintegration, research still neglects the idea that the basic law of zonal disintegration may be back analyzed according to the stress state of the bolt body. In this paper, the authors first establish the nonlinear rheological mechanical model of the rock mass on the elastoplastic interface of the surrounding rock, put forward the mechanics fracture criterion for the rock mass, and determine the fracture zone quantities as well as its formation moment.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Law Of the Coordinated Deformation Of The Surroundingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…In recent years, scholars at home and abroad have conducted a large number of studies on the failure characteristics of deep surrounding rocks through field investigation [25,26], theoretical analysis [27][28][29][30][31], laboratory experiments [32,33], numerical simulation [34][35][36][37], and other methods and found that deep surrounding rocks will appear zonal disintegration [38,39], and studies have shown that the damage range of the zonal disintegration of the deep roadway surrounding rock is much larger than that of the shallow. From the perspective of roadway surrounding rock control, the damage and deformation of surrounding rock should be minimized.…”

Section: Introductionmentioning

confidence: 99%

Research on Permeability Enhancement Model of Pressure Relief Roadway for Deep Coal Roadway Strip

Wang

Cao

et al. 2022

Geofluids

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Aiming at the problem of permeability enhancement in deep coal roadway strip, it proposed a pressure relief roadway permeability enhancement model, and the model was verified through experiments, theoretical calculations, and field tests. The experiment reveals that the unloading of gas-containing coal can achieve the effect of permeability enhancement. Theoretical calculation shows that with the increase of the distance from the coal seam, the overlying coal seam’s permeability enhancement multiple and the width of the significant permeability enhancement zone gradually decrease, and the width of the general permeability enhancement zone gradually increases and then stabilizes. Field tests show that the pressure relief roadway is arranged 9 m directly below the coal seam; the overlying coal strata has a significant pressure relief and permeability enhancement effect. This research can provide reference value for the high-efficiency permeability enhancement in the deep coal roadway strip.

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“…In theoretical analysis, a non-euclidean analytic model was established to determine the incompatible deformation of zonal disintegration in deep rock masses [2,3]. A strain gradient model was established to obtain the stress field in elastic and plastic zones, and the formation of zonal disintegration of rock mass near deep level tunnel was elucidated [4]. A mechanical model is proposed to investigate zonal disintegration mechanism of cross-anisotropic rock masses around a deep circular tunnel subjected to dynamic unloading under hydrostatic pressure condition [5].…”

Section: Introductionmentioning

confidence: 99%

Geomechanical Model Test and Energy Mechanism Analysis of Zonal Disintegration in Deep Surrounding Rock

Gao

Zhang

et al. 2018

Geosciences

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Abstract:With the decreasing of shallow resources, underground roadways of resources exploitation have reached into deep rock mass with high geostress. A series of new failure phenomena such as zonal disintegration phenomenon were discovered in deep surrounding rock, which is completely different from shallow caverns. To reveal the formation mechanism of zonal disintegration, the geomechanical model test and energy mechanism analysis of zonal disintegration were carried out respectively. Taking the deep roadway of Dingji coal mine in China's Huainan coal mine as engineering background, a 3D geomechanical model test was carried out relying on the high stress 3D loading test system. The zonal disintegration phenomenon was observed, and the oscillation law of displacement was measured. Based on the strain gradient theory and continuum damage mechanics, the elastoplastic damage model was established. An energy failure criterion was proposed by principle of energy dissipation and release. The ODE45 function in Matlab software was used to solve the displacements and stresses of excavated model roadway. The analytical solutions the and the geomechanical model test were basically consistent. The applicability of theoretical model and energy failure criterion were confirmed to explain the mechanism of zonal disintegration and it can be used to provide theoretical support for the failure and supporting design of surrounding rock in deep underground engineering.

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Strain Gradient Model of Zonal Disintegration of Rock Mass near Deep-Level Tunnels

Cited by 9 publications

References 17 publications

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

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

Research on Permeability Enhancement Model of Pressure Relief Roadway for Deep Coal Roadway Strip

Geomechanical Model Test and Energy Mechanism Analysis of Zonal Disintegration in Deep Surrounding Rock

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