Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof: A Case Study

Yang, Haibo; Zhang, Nong; Sun, Yuantian; Pan, Dongjiang; Sun, Changlun

doi:10.3390/su12041375

Cited by 16 publications

(13 citation statements)

References 18 publications

(20 reference statements)

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“…Through increasing the length of roof and coal wall bolts, the bearing ring of shallow rock foundation was constructed, which could pass through the rock mass fracture ring to the stable rock stratum with small deformation. The small displacement of deep rock stratum was used to restrain the large displacement of shallow rock stratum, to realize the linkage of large displacement and small displacement [18][19][20].…”

Section: Coordinated Bearing Support Technology Of Thick Roof Anchored With Double Circle Layermentioning

confidence: 99%

Zoning Control Technology of Gob-Side Roadway Driving with Small Coal Pillar Facing Mining in a Special Isolated Island Working Face: A Case Study

et al. 2021

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The gob-side roadway in an isolated island working face is a typical representative of a strong mining roadway, which seriously restricts the efficient and safe production of underground coal mines. With the engineering background of the main transportation roadway 1513 (MTR 1513) of the Xinyi Coal Mine, this paper introduces the engineering case of gob-side roadway driving with small coal-pillar facing mining in an isolated island working face under the alternate mining of wide and narrow working faces. Through comprehensive research methods, we studied zoning disturbance deformation characteristics and stress evolution law of gob-side roadway driving under face mining. Based on the characteristics of zoning disturbance, MTR 1513 is divided into three zones, which are the heading face mining zone, the mining influenced zone, and the mining stability zone. A collaborative control technology using pressure relief and anchoring is proposed, and the differentiated control method is formed for the three zones. For the heading face mining zone, the control method of anchoring first and then pressure relief is adopted; for the mining influenced zone, the control idea of synchronous coordination of pressure relief and anchorage is adopted; for the mining stability zone, the control method of anchoring without pressure relief is adopted. Engineering practices show that the disturbance influence distance of working face 1511 on MTR 1513 changes from 110 m advanced to 175 m delay. At this time, the surrounding rock deformation is effectively controlled, which verified the rationality of the division and the feasibility of three zoning control technology. The research results can provide reference for gob-side roadway driving with small coal pillar facing mining in a special isolated island working face.

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Section: Coordinated Bearing Support Technology Of Thick Roof Anchored With Double Circle Layermentioning

confidence: 99%

Zoning Control Technology of Gob-Side Roadway Driving with Small Coal Pillar Facing Mining in a Special Isolated Island Working Face: A Case Study

et al. 2021

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“…Wang [22] set up a theoretical analysis and a series of experiments concerning the large nonlinear deformation in the deep coal mine and designed the coupling support techniques with CRLD. Yang [23] selected a deep coal roadway as the research ground, applied the long high-performance bolt to construct a large thickness bearing zone in the roadway roof, and analyzed the relationship of bolt resistance interacting with the surrounding rock. Zhao [24] proposed and applied the double-layer arch collaborative reinforcement technology in engineering practice, using the combination of shotcrete and anchor bolt with grout.…”

Section: Introductionmentioning

confidence: 99%

Damage Data Analysis of Deep Coal Roadway Roof and Application of Long Anchorage and Zone Linkage Support Technology

Wang

Zhang

et al. 2022

Sustainability

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China’s energy structure mainly depends on coal resources, which will still play the dominant role in economic development in the future. With the mining depth increasing, the deep roadway construction will be exposed to a complex stress environment, increasing the difficulty of roof control and further hindering the mining activities. The problem of deep roadway excavation causing significant fracture scope of surrounding rock in and outside the anchorage zone has attracted much attention. For the large crack scope existing in the roadway roof of deep underground openings, this paper focuses on the exploration of upgrading the support system. In order to solve this problem, we investigated the zone damage of the roadway roof with the discrete element model using the UDEC trigon method and damage quantified evaluation with data analysis. The long anchorage and zone linkage support technology was proposed based on the damage control effect of varying lengths of supporting bolts. The purpose of extending the length of bolts is to link the more severely damaged rock mass in the shallow part to the minimum damaged part in the deep place, aiming to form the thick anchor zone to mobilize the rock mass in each zone to participate and bear the load together. Furthermore, the onsite application of long anchorage and zone linkage technology gained good control effects in the selected typical roadway with different geological conditions. The results show obvious resistance in cross-section shrinkage, integrity maintenance, and minimization of crack scope in the roadway roof. The promotion of long anchorage zone linkage technology can help the mine with similar situations uplift the efficiency of working and guarantee the safety of miners during mine service life in the deep coal roadway.

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“…From solid coal roadways to the gob-side entries retaining and driving, and from shallow roadways to deep high-stress roadways, it exists in various roadway support designs in coal mines [22,23]. From the perspective of the actual construction process of the coal mine, the process of coal roadway bolt supports mostly includes drilling, anchoring agent insertion, mixing, gel, and bolt tensioning [24,25]. This anchoring method has several disadvantages, e.g., affecting the transmission of the anchoring force, reducing the control effect on the surrounding rock, invalid anchoring sections of bolts, wastage of anchoring materials, and threats to safe production [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Full-Stress Anchoring Technology and Application of Bolts in the Coal Roadway

et al. 2021

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The traditional anchoring method of bolts has insufficient control over the surrounding rock of the coal roadway. Based on this background, full-stress anchoring technology of bolts was proposed. Firstly, a mechanical relationship model of a bolt-drawing, anchoring interface was established to obtain the equations of the axial force and obtain shear stress distribution as well as the decreasing-load transfer law of the anchoring section of bolts. Through studying the prestress-loading experimental device of bolts, we found that increasing the initial preload could increase the axial force under the same conditions and the retarded anchoring section could control the axial-force loss of bolts in the middle of the anchoring section. Under the full-stress anchoring mode, the effect of applying a pre-tightening force was better than that of applying a pre-tightening force under traditional anchoring methods. Moreover, FLAC3D (Fast Lagrangian Analysis of Continua 3D; ITASCA (Ita sca International Inc), Minnesota, USA) numerical simulation calculation was performed. Under the full-stress anchoring mode of bolts, the increased anchoring length reduced the damage of the anchoring section, with a wider control range of the rock formation and higher strength of the compressive-stress anchoring zone. Based on the above research, four methods for applying the full-stress anchoring technology of bolts in engineering were proposed. The full-stress anchoring technology of bolts in the coal roadway has been applied in the support project of the return-air roadway at working face 3204 of the Taitou Coking Coal Mine of the Xiangning Coking Coal Group, Shanxi. The maximum moving distance of the roof and floor of the roadway was reduced from 200 to 42 mm, and the maximum moving distance on both coal sides was reduced from 330 to 86 mm. The full-stress anchoring technology of bolts was able to control the surrounding rock in the coal roadway.

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Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof: A Case Study

Cited by 16 publications

References 18 publications

Zoning Control Technology of Gob-Side Roadway Driving with Small Coal Pillar Facing Mining in a Special Isolated Island Working Face: A Case Study

Zoning Control Technology of Gob-Side Roadway Driving with Small Coal Pillar Facing Mining in a Special Isolated Island Working Face: A Case Study

Damage Data Analysis of Deep Coal Roadway Roof and Application of Long Anchorage and Zone Linkage Support Technology

Full-Stress Anchoring Technology and Application of Bolts in the Coal Roadway

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