Mechanism and application of new prestressed yield bolt for controlling deep high-stress rock mass

Zhang, Jinpeng; Liu, Limin; Liu, Chuanxiao; Li, Yang

doi:10.1016/j.tust.2021.104254

Cited by 17 publications

(5 citation statements)

References 33 publications

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“…The deformation resistance of the bolt was enhanced to reduce the breaking of the rod caused by the rapid increase of stress so as to ensure early effectiveness. The stress-deformation characteristics of the prestressed yielding bolt are shown in Figure 4 [25]. Stages A-B represent the deformation of the yielding structure.…”

Section: Mechanism Of Prestressed Yielding Boltmentioning

confidence: 99%

“…Liu Zhigang et al [24] discussed the mechanism and effects of noncoupling stress-relief blasting under deep high stress. Zhang Jinpeng et al [25] proposed a new prestressed yield bolt with the engineering background of Shangping roadway in Huafeng Coal Mine. There are fewer studies on the control of the roadway surrounding rocks in multiple-stress concentration areas.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism and Application of Prestressed Yielding Support for Large-Span Roadway in Multistress Concentration Areas

Cao¹,

Zhang

Yang³

et al. 2023

Processes

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Close-distance multilayer coal mining is common. Under the condition of extremely close-distance coal seams, it is extremely difficult to control the surrounding rock of large-span open-off cut roadways in multistress concentration areas. Based on the engineering background of the 23616 open-off cut roadway in Chaili Coal Mine, this paper investigated the influence of upper close seam mining on the stress and deformation of the lower large-span roadway in detail. The control effect of a high-strength prestressed yielding bolt and cable was analyzed systematically. The support system stress was coordinated by the yielding member to avoid excessive stress on the local support structure and reduce the stress concentration of the surrounding rock. Before and after the upper coal mining, the stress changed mainly on the left and right sides, and the displacement changed mainly on the right side and roof. The maximum deformation of the roof and the right side and the left side at two engineering observation sections was 85 mm, 61 mm, 48 mm and 68 mm, 53 mm, 46 mm, respectively. The surrounding rock control effect was relatively ideal, which can meet the needs of roadway installation support.

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Section: Mechanism Of Prestressed Yielding Boltmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanism and Application of Prestressed Yielding Support for Large-Span Roadway in Multistress Concentration Areas

Cao¹,

Zhang

Yang³

et al. 2023

Processes

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show abstract

“…To compensate for flexible pressure relief, a constant resistance squeeze slip pressure relief bolt is proposed to absorb the energy of rock deformation caused by high ground stress [17] and a new type of bolt-deformation control bolt is also available (DC-bolt) [18]. A novel prestressed yield bolt with the engineering background of Shangping roadway in Huafeng Coal Mine is proposed [19]. A new constant resistance and yielding support technology based on a large deformation anchor cable is proposed to control large deformations of surrounding rocks [20].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on yielding and relief pressure support technology of fluid-filled lining in a high-ground stress soft rock tunnel

Liu,

Wang,

Yang

et al. 2024

Scientia Iranica

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High-ground stress soft rock tunnels have experienced large deformations. Yielding and pressure relief fluid-filled lining support technology is an effective method for solving large soft rock tunnel deformation due to the deformation characteristics of high-ground stress soft rock tunnels. To give the surrounding rock a certain amount of deformation space, a layer of fluid filling is set up at the reserved deformation of the tunnel. By creating a force test model of the inflatable carcass and water-filled carcass, the straight section of the tunnel support structure is simulated. When supporting large deformation soft rock tunnels, inflatable and water-filled carcasses produce fluid homogenization load shedding and fluid drainage load shedding effects. Inflatable carcasses and water-filled carcasses without leakage reduce load by about 28% and 7%, respectively. The peak load reduction rate under liquid leakage can gradually reach 100 %. Inflatable carcasses can dissipate up to 90% of the work of external forces acting on the supporting structure. The load reduction rate of water-filled carcass is 1.2 times that of inflatable carcass. Fluid-filled materials can remove load from secondary lining support structures after yielding and pressure relief. Design and construction of high-ground stress soft rock tunnels can be influenced by research results.

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“…Moffat et al [21] indicated that the optical fibre could be used to monitor the strain and the stress in the bolts under loading conditions and estimate the behaviour of rock mass during mining. Zhang et al [22] proposed a new prestressed yield bolt after considering the breakage characteristics of the bolt and the instability of deep and highly stressed roadways. Małkowski et al [23] conducted laboratory tests and numerical modelling on the mechanical behaviours of bolts with three bond types of resin, organic mineral glue and cement bond.…”

Section: Introductionmentioning

confidence: 99%

Bolting control of a coal roadway under multi-seam mining – a case study

Zhou,

Wu,

Kann

et al. 2024

Archives of Mining Sciences

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The stress field of the roadway under multi-seam mining is complex due to multiple mining disturbances. The bolting control of the roadway under multi-seam mining has attracted wide concern. Moreover, conventional metal supporting materials in the coal rib are prone to sparks when shearer works, and new bolting materials are urgently needed. Taking a track roadway under multi-seam mining in China as the engineering case, the mining-induced stress field of the track roadway under multi-seam mining was investigated through numerical simulation and lab and field tests. The test evaluated the mechanical behaviour of FRP bolts and rebar bolts, as well as their anchorage performance under different conditions. Comparative analysis was conducted on the deformation and failure characteristics of the roadway under different bolting parameters to determine an optimised bolting scheme for the track roadway in the I011501 working face. The results show that the goafs and the remaining coal pillars in the overlying coal seams increase the stress in the track roadway in the I011501 working face, especially for the lower rib and roof. The tensile force of the 27 mm-diameter FRP bolt is 1.2 times that of the 22 mm-diameter rebar bolt. The shear strength of the full-length anchored FRP bolt is 70.8% higher than that of the end-anchored bolt. The peak stress of the full-length-anchored bolt is in the shallow coal and rock mass. The optimised bolting scheme of the track roadway subject to multi-seam mining is determined, and the cost of the optimised bolting scheme is lower by about 25.2%, as compared with the primary bolting scheme. Numerical simulation and field application results indicate that the optimised bolting scheme can significantly reduce the deformation and plastic failure of the track roadway in the I011501 working face, which is under multi-seam mining conditions.

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Mechanism and application of new prestressed yield bolt for controlling deep high-stress rock mass

Cited by 17 publications

References 33 publications

Mechanism and Application of Prestressed Yielding Support for Large-Span Roadway in Multistress Concentration Areas

Mechanism and Application of Prestressed Yielding Support for Large-Span Roadway in Multistress Concentration Areas

Experimental study on yielding and relief pressure support technology of fluid-filled lining in a high-ground stress soft rock tunnel

Bolting control of a coal roadway under multi-seam mining – a case study

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