Discrete element simulation of the control technology of large section roadway along a fault to drivage under strong mining

Zhang, Shuai; Zhang, Dongsheng; Wang, Hongzhi; Liang, Shuaishuai

doi:10.1088/1742-2140/aae052

Cited by 23 publications

(15 citation statements)

References 32 publications

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“…A fitting method adopted in previous related studies was used to acquire block contacts data [24,25]. To obtain the mechanical parameters of block contacts, many simulated uniaxial compression tests on synthetic rock specimens were adopted in this paper, as shown in Figure 10.…”

Section: Validation Of the Microscopic Parameters In The Udec Modelmentioning

confidence: 99%

Stability Control Mechanism of High‐Stress Roadway Surrounding Rock by Roof Fracturing and Rock Mass Filling

Yang

et al. 2021

Advances in Civil Engineering

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Large deformation of roadway and coal bump failures have always been the focus in deep underground engineering. By considering the Lu’an mining district in China, the failure mode and stability improvement process of high-stress roadways were analysed with the field tests and numerical simulations. The field test results showed that a great amount of deformation and serious damage occurred in surrounding rocks during panel retreat due to the suspended roof. A novel approach employing roof fracturing and collapsed rock filling effect was adopted to maintain the roadway stability. A numerical model was established with the Universal Distinct Element Code (UDEC) to research the fracturing characteristics between the roadway and gob roofs and the stress change in the surrounding rock. The modelling results demonstrated that, without fracturing roof, the peak vertical stress of the coal pillar was 18.3 MPa and the peak vertical stress of the virgin coal rib was 15.6 MPa. The roadway was in a state of high stress. With fracturing roof, the peak vertical stress of coal pillar was 9.3 MPa and the peak vertical stress of virgin coal rib was 13.4 MPa. The fractured rock mass in the gob expanded in volume and provided supporting resistance to the overlying strata, which relieved stress concentrations in the coal pillar. Field measurement results indicated that the roadway large deformation was successfully resolved during excavation and panel retreat after implementing the novel approach, providing useful references for the application of this novel approach in similar coal mines.

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Section: Validation Of the Microscopic Parameters In The Udec Modelmentioning

confidence: 99%

Stability Control Mechanism of High‐Stress Roadway Surrounding Rock by Roof Fracturing and Rock Mass Filling

Yang

et al. 2021

Advances in Civil Engineering

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“…The calibration results of rock mass properties in UEDC Trigon are provided in Table 4 and Figure 11. The failed contacts were assumed to have zero cohesion and zero tension strength and residual friction angle in this study [32]. of triangular blocks to represent rock masses [31].…”

Section: Rock Property Calibrationmentioning

confidence: 99%

Deformation Failure Mechanism of Deep Vertical Shaft in Jinchuan Mining Area

Sun

Guo

et al. 2020

Sustainability

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Vertical shafts play an important role in the safe operation of mines. The stability of vertical shafts has always been a difficult problem in mining engineering, especially with the increasing of mining depth. In order to keep the engineering works stable, it is necessary to make the deformation failure mechanism of vertical shafts clear. This paper describes a case study of the deformation and failure mechanisms of the vertical shaft in Jinchuan No. 2 mining area in Gansu Province, China. Long-term deformation trends and characteristics of the vertical shaft are analyzed through ground movement and GPS monitoring of ground fissures. Then, based on previous research experience and a detailed field investigation, the modes, influencing factors, and mechanisms of deformation failure in the vertical shaft are studied. To further investigate the mechanism of shaft deformation failure and damage process under mining, the Universal Discrete Element Code (UDEC) software with Trigon approach is employed to build the numerical model of the vertical shaft. Through displacement, stress, and damage analysis, the time, location, and cause of vertical shaft failure during mining are explicitly illustrated. The results suggest that the upper and lower parts of the fault are activated in different ways. The damage to the vertical shaft is still developing at a very high rate under mining with filling method. All our results throw light on the nature of deformation and failure of vertical shafts, and several suggestions for the engineering of deep vertical shafts are finally put forward, providing a reference for other engineering.

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“…e failure criterion could be expressed in the plane (σ 1 , σ 3 ), as shown in Figure 9. e failure envelope is defined from point A to point B by the Mohr-Coulomb yield function [48]:…”

Section: Numerical Simulationmentioning

confidence: 99%

The Key Stratum Structure Morphology of Longwall Mechanized Top Coal Caving Mining in Extra‐Thick Coal Seams: A Typical Case Study

et al. 2020

Advances in Civil Engineering

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Longwall mechanized top coal caving mining (LMTCCM) in extra-thick coal seams has its own characteristics. The law of mining pressure and overlying strata failure height in extra-thick coal seams are much larger than those of medium-thick and thick coal seams. The key stratum structure morphology also has an important influence on the law of overlying strata movement and stability of surrounding rock. Based on the engineering geological conditions, this paper used the method of theoretical analysis and numerical simulation to study the key stratum structure morphology of LMTCCM in extra-thick coal seams. The results show that under the condition of LMTCCM in extra-thick coal seams, the key stratum forms the structure of low cantilever beam and high hinged rock beam. With the increase of coal seam thickness, the breaking position of cantilever beam is closer to the coal wall. Through theoretical calculation, it is obtained that the breaking length of cantilever beam is 31.5 m and the breaking position of cantilever beam is 15.4 m away from coal wall. With the increase of cycle, key strata will undergo the evolution law from the generation of longitudinal cracks to the hinged structure and then to the cantilever beam structure. The breakage of key strata will cause the expansion of longitudinal cracks and the overall synchronous movement of overlying strata. With the increase of coal seam thickness, the distribution of longitudinal cracks will gradually transfer from the upper part of goaf to the deep part of coal body in space and increase in quantity. This research is of great significance for improving the stability of overlying strata and ensuring the safe and efficient mining of extra-thick coal seams.

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Discrete element simulation of the control technology of large section roadway along a fault to drivage under strong mining

Cited by 23 publications

References 32 publications

Stability Control Mechanism of High‐Stress Roadway Surrounding Rock by Roof Fracturing and Rock Mass Filling

Stability Control Mechanism of High‐Stress Roadway Surrounding Rock by Roof Fracturing and Rock Mass Filling

Deformation Failure Mechanism of Deep Vertical Shaft in Jinchuan Mining Area

The Key Stratum Structure Morphology of Longwall Mechanized Top Coal Caving Mining in Extra‐Thick Coal Seams: A Typical Case Study

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