Numerical Investigation of Gob‐Side Entry Retaining through Precut Overhanging Hard Roof to Control Rockburst

Sun, Xiaoming; Gan, Li; Zhao, Chengwei; Tang, Jianquan; He, Manchao; Song, Peng; Miao, Chengyu

doi:10.1155/2018/8685427

Cited by 11 publications

(8 citation statements)

References 16 publications

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“…e main research contents involved in gob-side entry retaining include the law of surrounding rock activity, the interaction relationship between surrounding rock and support, the support in roadway, reinforcement support, and roadside support [12][13][14][15][16]. Around these contents, some experts and scholars studied the strata behavior law of gobside entry retaining in fully mechanized top coal caving [17,18], analyzed the main parameters and adaptability of gob-side entry retaining [19][20][21], and according to the laboratory test results, analyzed two kinds of roof breaking modes of gob-side entry retaining in fully mechanized top coal caving and their influence on surrounding rock deformation [22,23].…”

Section: Introductionmentioning

confidence: 99%

Study on Surrounding Rock Stability Mechanism of Gob‐Side Entry Retaining with Prefabricated Fracture

Hao

Zhu

2021

Advances in Civil Engineering

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To study the optimal layout of prefabricated roof cutting line in gob-side entry retaining with roof cutting and pressure relief, based on the engineering geological conditions of 5249 working face in Beipingdong Coal Mine of Baoyuan Mining Company, the FLAC3D numerical simulation method was used to study the surrounding rock characteristics of gob-side entry retaining under different layout conditions of prefabricated roof cutting line, and the optimal layout of prefabricated roof cutting line in gob-side entry retaining with roof cutting and pressure relief was proposed. The results show that the roadway floor has a certain degree of floor heave with the mining process under different angles. The angle between the prefabricated roof cutting line and the vertical line of the roadway has little effect on the lateral displacement of the coal body in the mining process of gob-side entry retaining. When the cutting angle is 10°, the stability of the surrounding rock of gob-side entry retaining is more stable than that of other angles, and the plastic range is small. The stability of the surrounding rock of the roadway is more stable than that of other angles, which is conducive to the safe mining of 5249 working faces in Beipingdong Coal Mine.

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Section: Introductionmentioning

confidence: 99%

Study on Surrounding Rock Stability Mechanism of Gob‐Side Entry Retaining with Prefabricated Fracture

Hao

Zhu

2021

Advances in Civil Engineering

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“…Among them, U-type ventilation is mainly used in traditional longwall mining methods. In recent years, due to the improvement of coal mining methods, Y-type ventilation has been widely adopted in mining operations (Sun et al 2018;Wang et al 2018aWang et al , 2018b. In the mining of adjacent working faces, the gobside entry retaining technology can preserve the roadway and increase the ventilation time.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on heat transfer between airflow and surrounding rock with two major ventilation models in deep coal mine

Guo

Pang

et al. 2020

Arab J Geosci

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Not only is the thermal environment of the coal mining face related to the temperature of the surrounding rock, it is also closely associated with the ventilation model of the working face. In this study, the numerical methods were applied to study the impact of two major ventilation systems on the airflow temperature of working face in coalmine. Firstly, a heat transfer model of the surrounding rock and airflow was established to reveal that the wall roughness of the surrounding rock could enhance heat transfer between the surrounding rock and the airflow. Moreover, an analysis was conducted of the heat transfer between the airflow and the surrounding rock under different modes of ventilation in the first mining face. According to the analytical results, the temperature of airflow in the U-type ventilation system is lower than in the Y-type ventilation system. For the next adjacent coal mining face, however, the Y-type ventilation system is more conducive in reducing the temperature of the airflow. Therefore, with regard to the mine as a whole, the Y-type ventilation system is more effective than a U-type system in reducing heat and humidity in the ambient environment.

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“…Excavation in deep hard rock causes a sudden release of high intensity energy stored in the rock mass, which plays an important role in inducing surface spalling and rock burst [1][2][3]. It has been widely accepted that the spalling and rock burst near the surface of rock wall is a typical brittle failure [4,5]. W. f. Brace et al studied the entire process of brittle-shear fracture under compression and proposed that the failure process of brittle rock can be divided into the following stages [6,7]: fracture closure, linear elastic deformation, fracture initiation, stable fracture propagation, fracture coalescence, development of unstable fractures, failure, and fracture mode after peak strength.…”

Section: Introductionmentioning

confidence: 99%

Research of Transitional Failure Mode as Damage Evolution in Rock Wall

et al. 2020

Advances in Civil Engineering

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The stress condition of tunnel surrounding rock mass is complex. The stress concentration of in situ brittle rock mass caused by excavation results in localized damage evolution parallel to the free face, which is called surface instability. The rock wall shows the transition characteristics of the failure mode with the distance from the surface to the depth. Low strength surface instability and transition failure modes of the tunnel’s rock wall are common in deep condition but cylindrical specimens cannot simulate stress state of rock wall surface well in conventional rock mechanics tests. This paper conducted the indoor experimental study of the biaxial stress state and studied the surface instability of samples. An indoor test device for the simulation of transitional surface failure of the rock wall was developed. Through a biaxial stress loading test on the rectangular rock sample, the damage process and crack development of rock samples were analyzed, and the law of stress and strain related to the failure mode transition was characterized as well. Based on test results and strength analysis, an explanation of the failure theory and its corresponding model are proposed based on the maximum strain strength theory. Furthermore, this paper concludes that the failure mode of surface instability presents transition feature from brittle to ductile with the increase of distance from the surface to depth.

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Numerical Investigation of Gob‐Side Entry Retaining through Precut Overhanging Hard Roof to Control Rockburst

Cited by 11 publications

References 16 publications

Study on Surrounding Rock Stability Mechanism of Gob‐Side Entry Retaining with Prefabricated Fracture

Study on Surrounding Rock Stability Mechanism of Gob‐Side Entry Retaining with Prefabricated Fracture

Numerical study on heat transfer between airflow and surrounding rock with two major ventilation models in deep coal mine

Research of Transitional Failure Mode as Damage Evolution in Rock Wall

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