Stability Control and Quick Retaining Technology of Gob‐Side Entry: A Case Study

Luan, Hengjie; Jiang, Yujing; Zhou, Liangchen; Lin, Huili

doi:10.1155/2018/7357320

Cited by 19 publications

(13 citation statements)

References 18 publications

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“…Meanwhile, the residual bending moment of the beam fracture, M A , is much less than the bending moment occurring in the main roof, M O . By comparing the theoretical models for the fracture of the main roof at the gob side and at the solid coal side and Equations (10) and (17), obviously, the temporary support strength in the roadway when the fracture site of the main roof is at the solid coal side is greater than that required at the gob side; namely P 1 > P 3 . The fracture occurrs above the roadway; one end of block B is on the roadway, and there is no supporting force of the solid coal.…”

Section: Asmentioning

confidence: 99%

Stability Analysis of the Entry in a New Mining Approach Influenced by Roof Fracture Position

Yang

Wang

et al. 2019

Sustainability

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Non-coal pillar mining with roadway formed automatically (RFANM) is a new mining approach, which demonstrates revolutionary significance because it does not require making roadway before mining and coal pillar retaining. In order to explore the stability of the surrounding rock structure in RFANM, the deformation of the surrounding rock was theoretically analyzed and simulated based on three different fracture positions of the main roof. It was concluded that reasonable control of temporary support strength in roadway is of great importance to control the deformation of the entry. The deformation process of surrounding rock under different fracture positions in RFANM was simulated by using the Universal Discrete Element Code (UDEC). The results of the numerical simulation showed that the main roof was fractured at the solid coal side or gob side; the deformation of the roadway was small. The fracture condition of the main roof at the gob side required a higher effect of roof slitting or temporary support from the roadway. Through drilling and peeping at the retained roadway, it was judged that the main roof was broken inside the coal wall. Field monitoring results revealed that the deformation of the roadway can be effectively controlled.

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Section: Asmentioning

confidence: 99%

Stability Analysis of the Entry in a New Mining Approach Influenced by Roof Fracture Position

Yang

Wang

et al. 2019

Sustainability

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“…Yan et al [20] proposed a roof-cutting mechanical model of gob-side entry retention with a roadside backfill body; the roof-cutting resistance and the width of the roadside backfill body were calculated. Luan et al [21] analysed the surrounding rock structure formed in gob-side entry retention by building a concrete wall beside the roadway; bolt, cable, steel pipe, and angle irons were used to reinforce the surrounding rock. Wu et al [22] presented a dynamic-equilibrium mechanical model of the main roof structure; the mechanisms of formation of different types of short cantilever rock beam structures were clarified.…”

Section: Introductionmentioning

confidence: 99%

Study on Surrounding Rock Structure Evolution Characteristics and Roof Control Techniques of the Retained Roadway Formed by Roof Cutting in Inclined Coal Seams

Wang

Ren

et al. 2021

Shock and Vibration

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To control the roof during gob-side entry retaining by roof cutting in inclined coal seams, the retained gob-side roadway is zoned based on the mechanical principle and technological process of no-pillar mining with gob-entry retention. A simplified mechanical model for surrounding rocks in different subzones was established by using theoretical analysis and numerical simulation to attain the demand for the support resistance and deformation of the roof in different subzones. According to load and deformation characteristics of the roof and mechanical characteristics of NPR cables, single props, and a sliding-type gangue-retaining structure formed by U-shaped steel inserts, the supporting systems for roadways in different subzones and the constitutive model thereof were established. On this basis, the action of the supporting system was analysed and a field test was performed. The results show that the supporting system undergoes three stages of behaviour, i.e., pressure growth, yielding under constant pressure, and stabilisation during whole entry retention. It can guarantee the collaborative deformation of the supporting systems with the roof on the premise of constant support resistance, thus satisfying the requirement for roadway protection. The roadway 150 m back from the working face is stable, and the final convergence between the roof and floor of the retained entry is 257 mm, showing a favourable entry-retention effect.

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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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Stability Control and Quick Retaining Technology of Gob‐Side Entry: A Case Study

Cited by 19 publications

References 18 publications

Stability Analysis of the Entry in a New Mining Approach Influenced by Roof Fracture Position

Stability Analysis of the Entry in a New Mining Approach Influenced by Roof Fracture Position

Study on Surrounding Rock Structure Evolution Characteristics and Roof Control Techniques of the Retained Roadway Formed by Roof Cutting in Inclined Coal Seams

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

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