Numerical investigation on cracking behavior of granite with intersecting two-flaws: A flat-joint modeling method

Gao, Yongtao

doi:10.1590/1679-78255999

Cited by 6 publications

(3 citation statements)

References 31 publications

(42 reference statements)

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“…e failure characteristics of the surrounding rock and the reasonable spacing of the double-withdrawal channels were evaluated using FLAC3D numerical simulation software [29,30]. e numerical simulations were performed using a three-dimensional mechanical model (Figure 8), and the mechanical parameters of the rock formation were determined (Table 2).…”

Section: Model Establishment and Calculation Processmentioning

confidence: 99%

Stress Distribution and Optimum Spacing Determination of Double-Withdrawal-Channel Surrounding Rocks: A Case Study of Chinese Coal Mine

2021

Shock and Vibration

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In this study, the 31113 fully mechanised working face in the Lijiahao Coal Mine was selected as the project background. The failure characteristics and optimum spacing of a double-withdrawal-channel surrounding rock were extensively investigated through field measurements, theoretical analysis, and numerical simulations. The following results were obtained. The loading influence range of the working face was fixed. Under the influence of mining, the stress distribution variation in the double-withdrawal channels with spacing and the influence of stress distribution on the surrounding rock stability of the withdrawal channels were determined. The optimum distance between the double-withdrawal channels to achieve the stability of the surrounding rock was at least 25 m, and engineering measures are required to limit the mining height in the final mining stage. The rationality of the main and auxiliary withdrawal channel spacing of 25 m and measures to limit the mining height in the final stage were demonstrated. The findings of this study provide a valuable reference for constructing the layout of withdrawal channels in the adjacent working faces of the same mining area.

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Section: Model Establishment and Calculation Processmentioning

confidence: 99%

Stress Distribution and Optimum Spacing Determination of Double-Withdrawal-Channel Surrounding Rocks: A Case Study of Chinese Coal Mine

2021

Shock and Vibration

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“…FLAC 3D is a simulation software based on three-dimensional fast Lagrange difference analysis. It can simulate stress characteristics of the three-dimensional structure of soil and rock, which play an increasingly important role in the field of geotechnical engineering [21,39]. To obtain the stress distribution law in front of the working face during mining, a large FLAC 3D numerical model was established.…”

Section: Numerical Simulationmentioning

confidence: 99%

Failure Analysis of a Pre-Excavation Double Equipment Withdrawal Channel and Its Control Techniques

Guo

Lian

et al. 2020

Energies

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The use of pre-excavation equipment withdrawal channels (EWCs) at the stop-production line is important for the rapid withdrawal of coal mining equipment. However, during the final mining period, the dynamic pressure of a pre-excavated double EWC is severe, which leads to instability of the surrounding rock around the EWCs. Therefore, in this paper, the methods of field monitoring, theoretical analysis, and numerical simulation were used to systematically study the stress and plastic zone evolution of a double EWC during the final mining period. Firstly, the distribution characteristics of mining abutment pressure and roadway failure modes under the action of mining abutment pressure were analyzed theoretically. Afterward, a FLAC3D mining numerical model was established according to the distribution of rock strata obtained from roof detection. Finally, the evolution laws of the stress fields and plastic zones of the EWCs during final mining were obtained by numerical simulation. The present study suggests that asymmetric stress distribution dominates asymmetric failure of the surrounding rock around the EWCs during the final mining period, and deformation failure within 10 m from the working face to the main EWC (MEWC) accounted for most of the roadway deformation. Based on the research results combined with actual production experience, the stability control technique of the surrounding rock with reinforcement of anchor cables and double-row buttress hydraulic support for the MEWC was put forward. After the field application, the ideal result was obtained.

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“…Aiming at the problem of large roof deformation of soft rock roadway with large section, Yan et al [21] proposed the control system of the twice-formed roadway and "multi-support structure." In terms of composite roof research, Li et al [22,23] have studied the triggering effect of interlayer on surrounding rock failure. Jia et al [24,25] studied and analyzed that the main cause of roof caving accidents was the deterioration of roof rock assemblage.…”

Section: Introductionmentioning

confidence: 99%

Roof Failure Mechanism and Control Technology of Large Section Open-Off Cut in Soft Rock Strata with Thin Thickness

Lian

et al. 2021

Shock and Vibration

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The open-off cut is used for equipment installation of working face before underground mining, and its sectional size is larger than that of the mining roadway. Therefore, the stability of open-off cut surrounding rock determines whether the panel can be put into operation. To solve the roof instability of open-off cut in the Wanli No.1 coal mine, the roof failure mechanism of open-off cut under weak composite rock strata with thin thickness was studied by field monitoring, theoretical analysis, and numerical simulation. First, the characteristics of surrounding rock and the basic law of strata behaviors were obtained by detailed field monitoring. Afterward, FLAC3D numerical simulation and mechanical analysis were used to obtain the main mechanical control parameters of surrounding rock instability, and the existence of a soft interlayer above the roof is the main cause of roof instability. Based on this, the supporting parameters of the open-off cut were optimized and adjusted. The optimized parameters were applied to the adjacent 31207 open-off cut. The engineering practice showed that the optimized supporting parameters have an ideal control effect on roof stability.

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Numerical investigation on cracking behavior of granite with intersecting two-flaws: A flat-joint modeling method

Cited by 6 publications

References 31 publications

Stress Distribution and Optimum Spacing Determination of Double-Withdrawal-Channel Surrounding Rocks: A Case Study of Chinese Coal Mine

Stress Distribution and Optimum Spacing Determination of Double-Withdrawal-Channel Surrounding Rocks: A Case Study of Chinese Coal Mine

Failure Analysis of a Pre-Excavation Double Equipment Withdrawal Channel and Its Control Techniques

Roof Failure Mechanism and Control Technology of Large Section Open-Off Cut in Soft Rock Strata with Thin Thickness

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