Numerical investigation of unstable rock failure in underground mining condition

Gu, R.; Ozbay, U.

doi:10.1016/j.compgeo.2014.08.013

Cited by 41 publications

(19 citation statements)

References 9 publications

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“…In the two figures, the model value refers to the mean theoretical cutting force computed by Eq. (13) in the Evans' model; the simulation value refers to the mean cutting force simulated by our model. As shown in Figure 10, the model value and simulation value both increased linearly with the cutting depth.…”

Section: Comparison Between Simulation and Model Resultsmentioning

confidence: 99%

“…Qiao et al [12] created a reasonable coal rock constitutive model based on empirical formulas and previous experiments, and numerically simulated the coal rock cutting with conical picks. Gu and Ozbay [13] developed a numerical model of a double shear test device, and used the model to examine how the interface between coal seam and surrounding rock affects the failure stability of the side wall and coalface in the mining environment. The above experimental and theoretical research clearly manifests rock properties, providing the modelling methods and data supports for our analysis on the cutting performance of coal rock.…”

Section: Introductionmentioning

confidence: 99%

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Rock-Breaking Performance of Cutters of Tunnel Boring Machine in Broken Coal Rock Formation

Guo¹,

Lv²,

Wang³

et al. 2020

IJSSE

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This paper aims to design a suitable method to analyze the relationship between the rockbreaking performance and tunneling performance of the cutters of tunnel boring machine (TBM). Considering the cutting discontinuity in broken coal rock formation, the authors put forward a simulation method for the rock-breaking performance of TBM cutters. The material properties of broken coal rock with low mechanical strength and poor uniformity were described by a linear elastic constitutive model and a Drucker-Prager plastic model. The variations in the cutting force with cutting depths (5, 10 and 15mm) and rake angles (5, 10 and 15°) were observed through the simulations, aiming to disclose the mechanical nature of the contact, extrusion and peeling of the coal rock under the action of the cutter. The results show that a high cutting depth and a small rake angle are favorable for tunneling efficiency, but unfavorable for tunneling safety. Overall, the optimal cutting parameters were determined as the cutting depth of 10mm and rake angle of 15°. Our simulations were proved valid through comparison with the results of Evans' cutting resistance model for wedge cutters. The research results shed new light on the research into the TBM cutting of unstable coal rock.

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Section: Comparison Between Simulation and Model Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rock-Breaking Performance of Cutters of Tunnel Boring Machine in Broken Coal Rock Formation

Guo¹,

Lv²,

Wang³

et al. 2020

IJSSE

View full text Add to dashboard Cite

show abstract

“…FLAC3D numerical simulation software is used to simulate the stress distribution and deformation characteristics of the bottom gas extraction roadway under various disturbances in Pingbao Coal Mine [20]. e rock mechanics parameters are shown in Table 1.…”

Section: Numerical Simulation and Analysis Pingbao Coalmentioning

confidence: 99%

Research on the Deformation Characteristics and Support Technology of a Bottom Gas Extraction Roadway under Repeated Interference

Pan

et al. 2019

Advances in Civil Engineering

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Taking Pingbao Coal Mine as the engineering background, the stress distribution, surrounding rock displacement, and plastic zone distribution characteristics of a bottom gas extraction roadway are simulated by FLAC3D under multiple disturbances. The mining disturbance due to the overlying coal seam is obtained: the deformation of the roof subsidence and lower rib closure of the bottom gas extraction roadway are larger than the floor heave and upper rib closure, respectively. According to the mechanical analysis of the bottom gas extraction roadway, the equations for calculating the displacement at each point on the surface of the bottom gas extraction roadway and the methods for calculating the maximum displacement, the maximum normal stress, and the maximum shear stress are obtained to reasonably explain the deformation of the bottom gas extraction roadway under multiple disturbances. Then, the bolt-mesh-anchor and ladder beam support mode are designed. After onsite observation of the bottom gas extraction roadway of the 12030 coal mining face of the Pingbao Coal Mine, it is concluded that the deformation characteristics of the bottom gas extraction roadway basically conform to the abovementioned equations and that the support is effective. This paper can provide a reference for the optimization of bottom gas extraction roadway positioning, the determination of support parameters, and the deformation prediction around a bottom gas extraction roadway under similar conditions.

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“…e distinct element method (DEM) has the intrinsic ability to simulate the discontinuous and large displacement of rock masses. Some researchers have used UDEC software, used to apply the DEM, to simulate roof failure and collapse during underground coal mining [31][32][33][34]. Salmi et al studied a coal mining-induced landslide in Nattai North, Australia, using the DEM-based software UDEC [6].…”

Section: Introductionmentioning

confidence: 99%

Study on the Process and Mechanism of Slope Failure Induced by Mining under Open Pit Slope: A Case Study from Yanqianshan Iron Mine, China

Ren

Ding

et al. 2019

Advances in Civil Engineering

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Mining under an open pit slope results in the collapse and slide of the slope. In this paper, a combination of methods including Google Earth and field investigations is applied to investigate the process of eastern slope failure induced by underground mining in the Yanqianshan Iron Mine over five years. According to the observed ground deformation features, the geomorphic zone of the eastern slope can be divided into four regions (caved rock zone, cracking zone, toppling zone, and sliding zone). Break angles and fracture initiation angles at different times are counted separately. Based on the above work, the process of initiation and development of slope failure is studied. The analysis results show that the process of slope failure could be chronologically divided into three stages. First, a collapse pit, caused by the falling of the overlying strata above the goaf, appeared on the eastern slope. Then, the rock mass around the collapse pit slid into the pit to form a small landslide. Finally, because of mining disturbances and rock creep, a large landslide occurred on the northeastern phyllite slope. The control mechanisms of each failure stage are discussed separately. Finally, the RFPA3D code is employed to simulate the slope failure process under the influence of underground mining. The results are consistent with the field observations, which provided information on deformation failure and the mechanics of the slope that could not be directly observed in the field and deepened the mechanism analysis.

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Numerical investigation of unstable rock failure in underground mining condition

Cited by 41 publications

References 9 publications

Rock-Breaking Performance of Cutters of Tunnel Boring Machine in Broken Coal Rock Formation

Rock-Breaking Performance of Cutters of Tunnel Boring Machine in Broken Coal Rock Formation

Research on the Deformation Characteristics and Support Technology of a Bottom Gas Extraction Roadway under Repeated Interference

Study on the Process and Mechanism of Slope Failure Induced by Mining under Open Pit Slope: A Case Study from Yanqianshan Iron Mine, China

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