Experimental simulation and investigation of spalling failure of rectangular tunnel under different three-dimensional stress states

Gong, Fengqiang; Wu, Wuxing; Li, Tianbin; Si, Xuefeng

doi:10.1016/j.ijrmms.2019.104081

Cited by 99 publications

(26 citation statements)

References 22 publications

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“…e joints included in the samples are transfixion joints, which are divided into parallel joints and cross joints for analysis. e number of joints in each group is 10,20,30,40,50,60,70,80,90,100,120,140,160,180,200, 300, and 400, respectively.…”

Section: Numerical Calculation Modelmentioning

confidence: 99%

“…Spalling and rockburst are two common failure modes in deep hard-rock tunnels [7,8]. Rock spalling, embodied as parallel fractures close to the free surface, is a tensional and brittle splitting failure process with no obvious ejection performance [2,9,10]. Different from the static failure mode of spalling, rockburst is a kind of artificial earthquake induced by human activities, such as mining excavations [4-6, 11, 12].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Joint Density on Rockburst Proneness of the Elastic‐Brittle‐Plastic Rock Mass

Pan

Ren

Cai

2021

Shock and Vibration

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The prediction of rockburst proneness is the basis of preventing and controlling rockburst disasters in rock engineering. Based on energy theory and damage mechanics, the quantitative functional relationship between joint density and energy density was derived. Then, the theoretical results were verified by numerical simulation and uniaxial compression test, and the effect of joint density on rockburst proneness of the elastic-brittle-plastic rock mass was discussed. The results show that the relationship between the joint density and the dissipated energy index of the jointed rock mass is a logarithmic function. With the same total input energy, the higher the joint density, the more the damage dissipation energy. Even in the case of high joint density, the rock mass still has limited resistance to external failure. Under the same joint density, the strength of parallel jointed rock mass is better than that of the cross-jointed rock mass, and the parallel jointed rock mass can accumulate more elastic strain energy and has higher rockburst proneness. The joint density is closely related to the ability of the rock mass to store high strain energy. The higher the joint density is, the weaker the ability to accumulate the elastic strain energy of rock mass is and the lower the rockburst proneness is. It is helpful to predict rockburst proneness by investigating and studying the properties of geological discontinuities. The research results have some theoretical and engineering guiding significance for the prediction of rockburst proneness of the jointed rock mass.

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Section: Numerical Calculation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Joint Density on Rockburst Proneness of the Elastic‐Brittle‐Plastic Rock Mass

Pan

Ren

Cai

2021

Shock and Vibration

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“…For example, in actual deep hard-rock mines, when buried depth is 800m, surrounding rock is prone to spalling, and the vertical principal stress is about 22MPa. Taking a laboratory true triaxial test as an example [32], the externally applied vertical principal stress reached 150 MPa when specimen with a hole occurs spalling, which was 7 times the actual ground stress. This shows that the spalling and failure phenomenon of surrounding rock in deep mines needs more complete research and explanation.…”

Section: Introductionmentioning

confidence: 99%

Field investigation and analysis of rockburst and spalling in a deep hard-rock mine

Xiao¹,

Guo-yan²,

Liu³

2021

Preprint

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In order to investigate the ground pressure disasters in deep hard-rock mines, field investigation and theoretical analysis were carried out in a deep hard-rock mine. It is found that the degree and number of ground pressure disasters in the mine have increased significantly with depth. When the maximum tangential stress between 0.4-0.6 times the uniaxial compressive strength of surrounding rock, surrounding rock is prone to local spalling. When maximum tangential stress is greater than 0.6 times uniaxial compressive strength, serious failure is easy to occur, such as rockbursts and large-area collapses. After excavation, the rebound strain and displacement of surrounding rock increases linearly with buried depth, and the strain energy released of surrounding rock increases rapidly with the second power of buried depth. The rapidly increasing strain energy is main reason why deep ground pressure disasters in the mine are becoming more and more serious. In terms of surrounding rock support, energy-absorbing materials such as energy-absorbing bolts can well absorb strain energy released by surrounding rock. The energy-absorbing bolts are used for design of roadway support in the mine.

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“…Researchers have provided in-depth discussions and research on this issue [4][5][6][7]. Gong et al studied the deformation and failure characteristics of the surrounding rock of deep high-stress roadways [8][9][10][11]. To study the phenomenon of large subsidence of the composite roof and the failure of support, Yu et al summarized the failure forms under different surrounding rock conditions and analyzed the roadway instability mechanism of the composite roof [12].…”

Section: Introductionmentioning

confidence: 99%

Study on Deformation Mechanism and Supporting Countermeasures of Compound Roofs in Loose and Weak Coal Roadways

Cui

Wang

Che

et al. 2020

Advances in Civil Engineering

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This paper considers the 333 return airway of the Gaokeng Coal Mine to analyze the deformation characteristics and failure mechanism of the surrounding rock of the composite roof for a loose and weak coal roadway. The reasons for the large deformation are explored and the superiority of the prestressed truss and anchor rope is compared to ordinary anchor cables from the perspective of mechanics to propose a targeted coal roadway support method. Sinking of the composite roof in the coal roadway is accompanied with a release and transfer of the surrounding rock stress. The pressure of the composite roof transfers to the roadway sides and intensifies the fracture process of the coal body. As a result, the ability to support the composite roof is weakened, and it further bends and sinks to form a vicious cycle that repeats itself. Therefore, the support of the composite roof in the coal roadway should consider the roof, roadway sides, and floor as a single unit to achieve the support goal of reinforcing the roadway sides and roof. Based on the above analysis, a comprehensive control technology with a truss and anchor rope is proposed as the main body and a bolt + anchor cable + metal network as the auxiliary. This technology can improve the integral bearing capacity of the composite roof, strengthen the roadway side structures, and reinforce the roadway sides and roof. Numerical simulation and field application results show that the support scheme can effectively realize safe control of the composite roof in coal roadways.

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Experimental simulation and investigation of spalling failure of rectangular tunnel under different three-dimensional stress states

Cited by 99 publications

References 22 publications

Effect of Joint Density on Rockburst Proneness of the Elastic‐Brittle‐Plastic Rock Mass

Effect of Joint Density on Rockburst Proneness of the Elastic‐Brittle‐Plastic Rock Mass

Field investigation and analysis of rockburst and spalling in a deep hard-rock mine

Study on Deformation Mechanism and Supporting Countermeasures of Compound Roofs in Loose and Weak Coal Roadways

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