Experimental Study on the Self-Protection Performance of Anchor Bolts with Energy-Absorbing Tails

Dai, Lianpeng; Yi-shan, Pan; Wang, Aiwen; Xiao, Yonghui

doi:10.1007/s00603-019-01990-7

Cited by 27 publications

(14 citation statements)

References 11 publications

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“…e mechanical model is an important theoretical research method to reveal the mechanism and criterion of fault rockburst. In China and other foreign countries, Pan Dai et al [24,25] put forward the disturbance response criterion for fault rockburst and considered that the increase of shear stress and the decrease of normal stress on the fault plane are the main reasons for the occurrence of fault rockburst, and the interaction between the medium of the fault zone and its surrounding rock mechanical properties is the secondary reason affecting the occurrence of fault rockburst. In this way, the criterion of fault disturbance response well explains the influencing factors and mechanism of rockburst induced by fault instability, and it is the combination and extension of the elastic rebound theory proposed by Carpinteri and Borla in 1951 [26] and the stick-slip theory proposed by Brace and Byerlee in 1966 [27].…”

Section: Introductionmentioning

confidence: 99%

The Mechanical Criterion of Activation and Instability of Normal Fault Induced by the Movement of Key Stratum and Its Disaster‐Causing Mechanism of Rockburst in the Hanging Wall Mining

Pengfei

Jiabin

Wang

et al. 2021

Advances in Civil Engineering

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Coal mine rockburst is closely related to the complex geological structure. Understanding the criterion of the fault activation instability and the disaster-causing mechanism of rockburst under the influence of mining is the theoretical premise and important guarantee of safe and efficient coal mining. In this paper, based on the theory of key stratum, the mechanical model of fault slip instability in the normal fault during the hanging wall mining was established, and the instability criterion was derived. It is concluded that the fault slip instability of the hanging wall is mainly controlled by two factors: (1) the distance between coal seams and key stratum and (2) the distance between working face and fault. Moreover, these two factors have an inverse relation to the occurrence of rockburst. Subsequently, three conceptual models of rockburst induced by the fault stress transfer, stress concentration of coal pillars, and fault structural instability were proposed. Based on the rock mechanics theory, the rockburst carrier system model of “roof-coal seam-floor” near the fault was established. The mechanical essence of fault rockburst was obtained as follows: under the action of fault, the static load of fault coal pillar was increased and superimposed with the fault activation dynamic load, leading to high-strength rockburst disaster. Based on the occurrence mechanism of fault rockburst, the monitoring and prevention concept and technical measures were proposed in three aspects, including the monitoring and control of fault activation dynamic loads, the monitoring of high static load in fault coal pillar and stress release, and the strengthening roadway support. These prevention and control measures were verified in the panel 103down02 of the Baodian Coal Mine in engineering, and the effectiveness of these measures was proved.

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Section: Introductionmentioning

confidence: 99%

The Mechanical Criterion of Activation and Instability of Normal Fault Induced by the Movement of Key Stratum and Its Disaster‐Causing Mechanism of Rockburst in the Hanging Wall Mining

Pengfei

Jiabin

Wang

et al. 2021

Advances in Civil Engineering

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“…Gao and co-workers [ 22 , 23 ] proposed the strong–soft–strong structure theory of rockburst events in mine roadways and analysed their wave absorption and energy absorption characteristics, failure criterion and energy absorption effect. Pan and co-workers [ 24 , 25 ] described a flexible-coupling fast-yielding support based on pendulum wave theory, fast energy absorption and yielding support. Lü & Pan [ 26 ] studied the propagation and attenuation of stress waves in roadways, obtained the energy and stress criterion of stress waves in the surrounding rock, and proposed a rigid-flexible coupled support system.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the evolution and control of fractures in surrounding rock under different pressure relief and support measures in mine roadways prone to rockburst events

Gao

et al. 2021

R. Soc. open sci.

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This paper studies the evolution and control of surrounding rock under different pressure relief support conditions in mine roadways in which rockburst events have occurred. The evolution of fractures in the surrounding rock was determined from borehole images obtained with a digital panoramic borehole camera, and the surface displacement due to the rockburst events in the mine roadway was measured. According to the existing problems of the original support system of the roadway, a new coupled support system to prevent rockburst events in mine roadways was proposed, resolving both the pressure relief and support of the roadway. Field measurements indicate that the effect on the roadway under the coupled method of pressure relief and support was more satisfactory than that under the original support system. With the coupled support method, the surface displacement of the roadway was approximately 0.6 m, fractures were distributed only in the soft structures and bolt anchorage areas, and the maximum depth of the fractures was 2.95 m. By contrast, under the original support system, fractures were distributed throughout the roadway surrounding rock, and the maximum depth of fractures was 6.75 m. This coupled roadway support technology of pressure relief and support effectively maintains the stability of the rock surrounding the roadway and ensures the safety of the working face. The research results can provide a reference for damage prevention and support of mine roadways prone to rockburst events.

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“…Dai et al [23], designed a split steel sleeve with a wall thickness of 4 mm and length of 150 mm, which was fabricated from Q235 mild steel ductile metal. Furthemore, Dai et al [24] stated that, the constant resistance value of the splitting energy absorber is as high as 125-150 kN, while the energy-absorption efficiency is 0.111-0.127 kJ/mm.…”

Section: Introductionmentioning

confidence: 99%

Adjustment of the Yielding System of Mechanical Rock Bolts for Room and Pillar Mining Method in Stratified Rock Mass

et al. 2020

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The article presents a novel yielding mechanism, especially designed for the rock bolt support. Mechanical rock bolts with an expansion head and equipped with one, two, four and six dome bearing plates were tested in the laboratory conditions. Furthermore, in the Phase2D numerical program, five room and pillar widths were modeled. The main aim of numerical modeling was to determine the maximal range of the rock damage area and the total displacements in the expanded room. The models were made for a room and pillar method with a roof sag for copper ore deposits in the Legnica-Głogów Copper District in Poland. Additionally, in the article a load model of the rock bolt support as a result of a geomechanical seismic event is presented. Based on the results of laboratory tests (load–displacement characteristics), the strain energy of the bolt support equipped with the yielding device in the form of dome bearing plates was determined and compared with the impact energy caused by predicted falling rock layers. Based on the laboratory tests, numerical modeling and mathematical dynamic model of rock bolt support, the dependence of the drop height and the corresponding impact energy for the expanded room was determined.

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Experimental Study on the Self-Protection Performance of Anchor Bolts with Energy-Absorbing Tails

Cited by 27 publications

References 11 publications

The Mechanical Criterion of Activation and Instability of Normal Fault Induced by the Movement of Key Stratum and Its Disaster‐Causing Mechanism of Rockburst in the Hanging Wall Mining

The Mechanical Criterion of Activation and Instability of Normal Fault Induced by the Movement of Key Stratum and Its Disaster‐Causing Mechanism of Rockburst in the Hanging Wall Mining

Investigation of the evolution and control of fractures in surrounding rock under different pressure relief and support measures in mine roadways prone to rockburst events

Adjustment of the Yielding System of Mechanical Rock Bolts for Room and Pillar Mining Method in Stratified Rock Mass

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