Influence of anchorage length and pretension on the working resistance of rock bolt based on its tensile characteristics

Chang, Juan; He, Keqiang; Pang, Dongdong; Li, Dong; Li, Chuanming; Sun, Bingjun

doi:10.1007/s40789-021-00459-9

Cited by 29 publications

(16 citation statements)

References 24 publications

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“…In summary, the surrounding rock interacts with the bolt to generate an anchorage rock mass under the action of bolt support. The bolt has strong supporting ability, which can effectively improve the bearing capacity of the surrounding rock while reducing deformation and failure [29,30].…”

Section: Experimental Results and Analysismentioning

confidence: 99%

Experiment and Numerical Simulation of Strength and Stress Distribution Behaviors of Anchored Rock Mass in a Roadway

Zhao

Qin

et al. 2023

Geofluids

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Due to the influence of the ground stress, mining disturbance, and other factors, the roadway surrounding rock in deep underground engineering such as mines, tunnels, and underground caverns is prone to looseness and deformation with the excavation of roadways. In such engineering, the bolt support is frequently employed to stabilize the surrounding rock. In this work, a part of the anchor and the surrounding rock were taken as a simplified model of the anchorage rock mass, and the laboratory compression test was performed on the similitude model. Then, the FLAC3D software was used to simulate varying numbers of bolts and different lateral pressure conditions, and the peak stress, the maximum principal stress field, and the anchor stress field distribution of the anchorage rock mass were obtained. The influence of bolt pretightening force and row spacing on the stability of surrounding rock was discussed using the combined arch theory. The results show that increasing the number of bolts and lateral pressure in the anchorage rock mass can significantly improve the stress value and distribution range of the maximum principal stress field and the anchorage stress field. The fluctuation of the anchorage stress field at different anchorage distances can be lessened by increasing the number of bolts (bolt density). When the lateral pressure exceeds 3 MPa, the anchorage mechanical characteristics of the anchorage rock mass tend to remain stable. The coverage of the effective anchorage stress field and the thickness of the surrounding rock anchorage composite arch can be increased by increasing the bolt pretightening force and decreasing row spacing, consequently improving the anchorage mechanical characteristics of the anchorage rock mass. The research results can be used as a theoretical reference for choosing appropriate bolt support parameters for the roadway surrounding rock.

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Section: Experimental Results and Analysismentioning

confidence: 99%

Experiment and Numerical Simulation of Strength and Stress Distribution Behaviors of Anchored Rock Mass in a Roadway

Zhao

Qin

et al. 2023

Geofluids

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“…According to Reference 27 , the bearing capacity of anchorage balanced arch is: where q is the bearing capacity of the arch, kN; D is the bolt or anchor cable spacing, m; Q is the bolt or anchor cable preload, kN; θ is internal friction angle of coal and rock mass, (°); l is the length of the bolt or anchor cable, m; R is the half the roadway span, m.…”

Section: Surrounding Rock Deformation and Control Principle Of The To...mentioning

confidence: 99%

Supporting optimization of thick seam roadway with top coal based on orthogonal matrix analysis

Jia

Fan

et al. 2023

Sci Rep

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Aiming at the problem of large deformation and difficulty in surrounding rock control of the top coal roadway in thick seam, theoretical analysis, theoretical analysis, numerical simulation, orthogonal matrix analysis and other methods were used to study the roof deformation and support parameter optimization of the top coal roadway in thick seam. Firstly, the structural model and roof mechanical model of the top coal roadway in thick seam were established, and the deformation coefficient TK was defined based on the relationship between curvature radius and bending moment, maximum bending moment and ultimate tensile strength of beam. According to the ratio of deformation rate between TK and beam to determine the roof deformation mode of top coal roadway, the discriminant conditions of roadway roof stability under two deformation conditions are obtained. Due to the characteristics of serious coal-rock fragmentation, large roof deformation, and integration of top coal and side coal. Therefore, the combined support method of “high prestressed long and short anchor cables” is proposed by double arch bearing structure control technology. Finally, based on the orthogonal matrix analysis method of supporting parameters optimization of the top coal roadway in thick seam, the analysis amount of supporting scheme is significantly reduced, the comprehensive evaluation of multi-factor and multi-supporting effect of roadway support is realized, and the optimal supporting scheme is obtained. Compared with the surrounding rock of the roadway without support, the deformation of the roof is reduced by 27.27%, the deformation of the two sides is reduced by 45.24%, and the tensile failure volume is reduced by 54.66%. The top coal roadway in thick seam has been effectively controlled, which provides guarantee for high yield and high efficiency of the mine.

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“…However, because of the shortcomings of traditional roadside supports, such as resistance and shrinkage and their inability to adapt to the large deformation of the surrounding rock and to effectively isolate the goaf, their use has been gradually eliminated. New high-water materials offer several advantages (Batugin et al 2021;Chang et al 2021;Orsborn and Zantos 1988;Tomlinson and Caroline 1990;Quesada-Kimzey et al 2016;Li and Liu 2018;Park et al 2019;Wang et al 2021;Wu et al 2020;Zhou et al 2020): They exhibit obvious plastic characteristics, undergo quick solidification, provide a rapid increase in resistance, have high strength, offer quick support of the roof, produce a specific compression rate after curing, are low cost, and are adaptable to the large deformation of surrounding rock of GER. Therefore, studying the engineering application of high-water material in GER roadside filling is essential for safe mining, improving coal recovery rate, and increasing economic benefits.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis and control technology of gob-side entry retaining with double roadways by filling with high-water material in gently inclined coal seam

Xie

Wang

Chen

et al. 2022

Int J Coal Sci Technol

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To ameliorate the defects of insufficient support resistance of traditional roadside filling bodies for gob-side entry retaining (GER), overcome the inability to adapt to the deformation of surrounding rock, and isolate the goaf effectively, a new type of high-water material as a roadside filling body for GER technology with double roadways was proposed. The instability analysis and control technology of GER with double roadways by filling high-water material into a gently inclined coal seam were studied. The basic mechanical properties of the new high-water material were investigated through laboratory experiments, and their main advantages were identified. The reasonable width of the roadside filling wall of a high-water material was obtained by combining ground pressure observation and theoretical calculations. The distribution characteristics of the stress and plastic zone of surrounding rock of GER after being stabilized by the disturbance of the working face were studied using numerical simulations, and the failure range of GER by filling with high-water material was revealed. Based on this, a coupling control technology of anchor cables and bolts + single props + metal mesh + anchor bolts is proposed. Through the coupling methods of arranging borehole peeping and observing the convergences of surrounding rock, the results demonstrate that GER with double roadways by filling with a 1.8-m-wide high-water material has a good control effect. The above research will play an active role in promoting the application of high-water materials in GER roadside filling.

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Influence of anchorage length and pretension on the working resistance of rock bolt based on its tensile characteristics

Cited by 29 publications

References 24 publications

Experiment and Numerical Simulation of Strength and Stress Distribution Behaviors of Anchored Rock Mass in a Roadway

Experiment and Numerical Simulation of Strength and Stress Distribution Behaviors of Anchored Rock Mass in a Roadway

Supporting optimization of thick seam roadway with top coal based on orthogonal matrix analysis

Stability analysis and control technology of gob-side entry retaining with double roadways by filling with high-water material in gently inclined coal seam

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