Establishing the need to model the actual state of stress along rock bolts

Singh, P.; Spearing, A.J.S.; Jessu, Kashi Vishwanath; Ribeiro, Pâmmela Caroline Pinazzi da Silva

doi:10.1016/j.ijmst.2020.03.002

Cited by 11 publications

(5 citation statements)

References 11 publications

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“…where E is the elastic modulus of the main roof, GPa; I is the inertia moment of the rock beam section, m 4 ; γ j is bulk density of the main roof, kN/m 3 ; y is the distance to one side of the beam, m; l is the length of the fixed beam, m. Under the action of external force, both ends of the fixed beam will appear stress concentration, which will lead large shear stress and tensile stress to reach the allowable stress easily [29,30]. Then, the tensile failure will occur at both ends of the fixed beam, and the tensile stress at the end is…”

Section: Roof Model Establishment and Motionmentioning

confidence: 99%

A Control Approach of the Roof in No-Pillar Roadway Formed by Roof Cutting and Pressure Releasing

Lou

Zhu

et al. 2021

Geofluids

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Roof control is one of the eternal themes of mine pressure theory, and it is also a key step of roadway formed by roof cutting. Based on the analysis of abutment pressure distribution, the viewpoint of controlling roadway roof by roof cutting distance is put forward according to the failure limit of roadway roof, and the calculation method of roof cutting distance is given. Based on the Qiuji coal mine’s background, the numerical and field test study is conducted to verify the theoretical analysis, and the allowable variation range of roof cutting distance is obtained. The research shows that the roof cutting distance, abutment pressure, and roadway deformation are closely related. By controlling the roof cutting distance, the roadway roof can be placed in the low-stress area, the roadway deformation can be reduced, and the support cost can be saved. This study provides a theoretical basis for explaining the roadway’s abnormal mine pressure and controlling the roadway roof by roof cutting.

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Section: Roof Model Establishment and Motionmentioning

confidence: 99%

A Control Approach of the Roof in No-Pillar Roadway Formed by Roof Cutting and Pressure Releasing

Lou

Zhu

et al. 2021

Geofluids

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“…The construction of the hydraulic power pack assembly is based on a variable displacement multi-piston pump with constant pressure and constant power regulators. The hydraulic power pack tank, which has a capacity of 450 dm 3 , is filled with HL46 hydraulic oil. The motor power is 18 kW, and the maximum supply pressure is 31 MPa.…”

Section: Laboratory Testsmentioning

confidence: 99%

“…In mining, one of the most important safety elements is anchor bolting [1][2][3][4][5]. Rock bolt roof support is used in underground mining mainly in ore mining.…”

Section: Introductionmentioning

confidence: 99%

Non-Destructive Acoustical Rock Bolt Testing System with Intelligent Filtering in Salt Mine ‘Wieliczka’

et al. 2021

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This article presents the application of a self-excited acoustic SAS system for non-destructive testing (NDT) for roof-bolt housings in laboratory and real mine conditions. The proposed system with a filtering mechanism was applied to the J64-27 composite anchors. The conducted tests allowed successful confirmation of the usefulness of the system in the detection of rod defects, damage of the mechanism coupling the anchor to the rock mass and testing of the stress state of the anchor itself. The proposed filtering system allowed eliminating the effect of jump change of frequency in the limit cycle of self-excited system. The proposed method is a novel solution for safety diagnostics of bolt housings in mining applications.

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“…Many scholars have carried out fuzzy research on the 'reinforcement force' or 'anchorage stress' generated in the reinforcement of anchor bolts, but relatively few studies have evaluated the scope of bolt action [18][19][20] . Based on the roof failure of a soft rock roadway in the 150202 working face of the Youzhong Coal Mine as the research background, this paper analyses and summarizes the causes of failure.…”

Section: Introductionmentioning

confidence: 99%

Study on the anchorage mechanism and roof stability control technology of bolts in fractured or weak surrounding rock

Wang,

Zheng,

Guo

et al. 2024

Preprint

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The effect of bolt support in mining roadways with fractured or weak surrounding rock is poor, and the roof easily loses stability. Studying the support control technology of bolts on fractured surrounding rock is necessary. Based on the theories of pressure arches and combined arch support, the bolt anchorage and anchorage effect angle are proposed a model is established, and the optimal bolt anchorage is calculated. The influence of related factors on the bolt anchorage and the scope of bolt action are analysed via numerical simulation and experimental methods. The pretightening force of the bolts and the spacing between the rows of bolts are positively correlated and negatively correlated with the bolt anchorage, respectively. The compression zone conforms to the reinforced arch state when the bolt end is anchored. The experimental work shows that the maximum spacing a of the anchor rods and the length L of the anchor rods in the surrounding rock satisfy 4.28a < 2L < 5a. The support of fractured surrounding rock is discussed, and the concept of roof fall prevention and control with an increasing or constant pretightening force, high surface strength and reasonable support density as the core principles is proposed. A field test of the Youzhong Coal Mine shows that the corresponding support effect is good and that this work provides a new method for roof support of fractured surrounding rock.

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Establishing the need to model the actual state of stress along rock bolts

Cited by 11 publications

References 11 publications

A Control Approach of the Roof in No-Pillar Roadway Formed by Roof Cutting and Pressure Releasing

A Control Approach of the Roof in No-Pillar Roadway Formed by Roof Cutting and Pressure Releasing

Non-Destructive Acoustical Rock Bolt Testing System with Intelligent Filtering in Salt Mine ‘Wieliczka’

Study on the anchorage mechanism and roof stability control technology of bolts in fractured or weak surrounding rock

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