Experimental and theoretical investigation on mechanisms performance of the rock-coal-bolt (RCB) composite system

Wu, Genshui; Yu, Wenxin; Zuo, Jianping; Du, Shaohua

doi:10.1016/j.ijmst.2020.08.002

Cited by 42 publications

(15 citation statements)

References 53 publications

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“…To reduce the deformation and damage to a wide roadway driven in soft coal seam, making and implementing a reasonable support and reinforcement plan are mandatory [24][25][26][27][28]. In this case, the large section coal roadway should be strengthened by grouting and then supported by bolt-mesh-anchors combined with constant resistance and large deformation (CRLD) anchor cables [29][30][31] Because the technical scheme includes roadway expansion, roof cutting, and road-inside filling, the project's full name was Integrated Expanding-cutting-filling with Gobside Entry Retaining (IEGER). A cross section of the IEGER scheme in a thick three-soft seam is shown in Figure 5.…”

Section: Project Design and Implementationmentioning

confidence: 99%

Theory and Application of Gob-Side Entry Retaining in Thick Three-Soft Coal Seam

Jun-chao

Zhang²

2021

Geofluids

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With the characteristic of less roadway excavation and high resource recovery, gob-side entry retaining (GER) technology is a safe and efficient green mining technology. Many experts and scholars have done extensive research on its principle and application. However, GERs are rarely used in thick soft coal seams. In this paper, based on the geological conditions of a coal mine in China, we propose a novelty approach of GER in thick three-soft coal seam (it means a single seam with a soft roof and a soft floor). The engineering scheme includes roadway expansion, large section roadway support, cutting roof to relieve pressure, and road-inside backfill body construction. The established mechanical and numerical calculation models effectively guide the engineering practice. Field observations showed that all the processes met the requirements of field production. The research results could provide theoretical guidance for the application of GER under similar geological conditions.

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Section: Project Design and Implementationmentioning

confidence: 99%

Theory and Application of Gob-Side Entry Retaining in Thick Three-Soft Coal Seam

Jun-chao

Zhang²

2021

Geofluids

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“…Yu et al [27] conducted tests on mechanical properties of sandstone and coal bolts under conventional triaxial compression at different angles. Wu et al conducted experimental and theoretical research on the mechanical properties of coal rock bolt (RCB) composite system [28]. e stress concentration areas such as bend, fork, bend and top of roadway and stope should be avoided, and the stress measuring point must be located in the stress area of the original rock-the area where the original stress state is not disturbed by the engineering.…”

Section: Ground Stress Characteristicsmentioning

confidence: 99%

Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal

Zhao

Zuo

Liu

et al. 2021

Advances in Civil Engineering

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The coal pillar stress distribution at the 311102 working face in the Bayangaole Mine is analyzed and revealed. In addition, borehole stressmeter, PASSAT monitoring system, and numerical modelling are fully utilized. Based on the patterns of acoustic wave velocity distribution, it is discovered that the impact created by mining activity can expand into the working face around 40 m, where the peak stress concentration is found about 15 m ahead. According to borehole stressmeter readings, mildly impacted, ordinarily impacted, and severely impacted zones are distinguished. The equilibrium theory and corresponding calculation indicated that the coal body in front of the working face has a plastic zone width of 4.96 m. The stress-displacement analysis based on numerical simulation showed that the relationship between peak vertical stress and pillar width is unimodal and bimodal. Specifically, both 5 and 10 m wide pillars showed a unimodal stress-width correlation and the peak vertical stresses are all located at the pillar center, whereas 15 m wide pillar has a bimodal stress-width relationship. In comparison, 10 m wide pillar holds the maximum in-situ stress. In consideration of site conditions and economic influences, 6 m wide coal strip coal pillar is designed at the working face 311102. As a result, stopping was successfully completed, and remarkable economic benefits were achieved.

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“…Chen et al [25] proposed the entry retaining technology combining the gangue belt with the grouting while considering the difficulties of filling the GER and determined the reasonable width of the gangue bag by numerical simulation. Yu et al [26,27] carried out a series of mechanical tests of rock-coalbolt (RCB) composite system for the complex nonlinear rock mechanics characteristics of deep coal mine and considered that the combination angle and bolt have a great influence on the combination system.…”

Section: Introductionmentioning

confidence: 99%

Deformation Law and Control Measures of Gob‐Side Entry Filled with Gangue in Deep Gobs: A Case Study

Liu

Hao

et al. 2021

Advances in Materials Science and Engineering

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Aiming at the large deformation problem of gob-side entry in solid filling mining, the roof subsidence of gob-side entry retaining (GER) was studied under the influence of gangue filling, by taking a deep filling working face in Shandong Province as the engineering background and using theoretical derivation as well as FLAC3D numerical simulation. Research shows that the stiffness of the gangue filling body in the gob and the stiffness and width of the entry protection coal and rock mass (EPCARM) are positively correlated with the GER roof subsidence, which is much less affected by the EPCARM parameters than by the GER stiffness. The GER failure to meet the application requirements is mainly attributed to the insufficient stiffness of the gangue filling body and excessive advance subsidence, which inhibit the roof stress transfer. The GER replacement by the gob-side entry driving (GED) scheme, which implies replacing the entry protection gangue bag wall with the coal pillar with a width of 5 m, will reduce the roof subsidence to 0.114 m, according to the proposed equation. The results obtained are considered quite instrumental in deformation control of the gob-side entry filled with gangue, as well as substantiation of GED and GER applicability options.

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Experimental and theoretical investigation on mechanisms performance of the rock-coal-bolt (RCB) composite system

Cited by 42 publications

References 53 publications

Theory and Application of Gob-Side Entry Retaining in Thick Three-Soft Coal Seam

Theory and Application of Gob-Side Entry Retaining in Thick Three-Soft Coal Seam

Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal

Deformation Law and Control Measures of Gob‐Side Entry Filled with Gangue in Deep Gobs: A Case Study

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