Bolt support mechanism based on elastic theory

Guo, Xiaoqian; Mao, Xianbiao; Ma, Chao; Huang, Jinglong

doi:10.1016/j.ijmst.2013.07.002

Cited by 13 publications

(6 citation statements)

References 2 publications

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“…Roadways built with weakly cemented material are typically vulnerable to significant issues like rapid decrease in anchoring force, substantial deformation of the neighboring rock, and a brief self-stabilization period. Although the traditional active support methods such as anchor bolt, anchor cable, and combined support with an anchor cable net can effectively control the deformation of the surrounding rock of coal roadways, such methods cannot limit the deformation of the surrounding rock of soft rock roadways and cannot meet the requirements of the support of soft rock roadways under the current coal mining conditions, and the stability of the roadway is difficult to be guaranteed [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Influence of Stress Disturbance on the Deformation of Nearby Cemented Roadways following the Excavation of Chambers

Zhang,

Gong

et al. 2024

Buildings

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Based on the engineering background of weakly cemented roadways and adjacent chambers in Western China, a numerical simulation method was used to examine the changes in stress distribution and increment in the surrounding rock of weakly cemented roadways adjacent to chambers. The results show that the surrounding rock stress of the weakly cemented roadway adjacent to the chambers increases by approximately 30%. The vertical stress of the surrounding rock mainly expands along the vertical direction, and the expansion range is 7–12 times that of the chamber height. The horizontal stress of the surrounding rock mainly expands along the horizontal direction, and the expansion range is 3–6 times that of the chamber width. Based on the support idea of “allowable deformation” + “relief pressure” + “maintaining roadway shape”, the support technology of weakly cemented roadways adjacent to chambers is established with “full section U-shaped steel shed + filling flexible materials between the steel shed and surrounding rock + patching the roof bolt + laying concrete on floor”. An engineering test based on the above support technology was carried out, and it was found that the deformation of the weakly cemented roadway adjacent to the chambers was 0 in 20 days.

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Section: Introductionmentioning

confidence: 99%

Influence of Stress Disturbance on the Deformation of Nearby Cemented Roadways following the Excavation of Chambers

Zhang,

Gong

et al. 2024

Buildings

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“…Song and Mu [22] discussed the theoretical calculation of the bearing capacity and supporting load of the bolt combination arch, the reasonable thickness of the combined arch, and the reasonable length of the anchor bolt and put forward relevant reasonable calculation formulas, based on the analysis of bolt-shotcrete support mechanism and failure characteristics of soft rock. In terms of anchorage mechanical properties, Guo et al [23] established the mechanical model (considering the tray effect) of anchorage surrounding rock based on the elastic theory, believing that the influence of the tray on the stress of the surrounding rock supported by the bolt axis can be ignored except near the surface of the surrounding rock. Based on the self-developed test system of the composite bolt-rock bearing structures, Zhang et al [24] investigated the influence of bolt support density on the bearing characteristics of anchor composite bearings, obtained the strength and failure characteristics of anchor composite bearings, and found the variation law of central stress and surrounding rock displacement of the composite bolt-rock bearing structure.…”

Section: Introductionmentioning

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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“…Since the gateway stability evaluation fails to correlate with the support parameters of the surrounding rock directly, it can only provide qualitative guidance to the gateway support parameters design and optimization instead of quantitative calculation guidance. Meanwhile, the optimization of the gateway support tends to occur in the case of major gateway deformation observed, which easily attracts the attention of researchers [12][13][14]. However, for gateways with small deformations, due to various safety risk concerns and the lack of quantitative evaluation methods, reducing the excess support strength is often overlooked with little optimization.…”

Section: Introductionmentioning

confidence: 99%

A Study of Safety Coefficient Determination and Support Parameter Optimization Based on Vulnerability Preevaluation

Zhang

Gao

Yang

et al. 2021

Shock and Vibration

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The preevaluation to the vulnerability of the surrounding rocks is proposed as one of the reliable indicators of the safety coefficient of gateway support and a foundation to optimize the support design parameters. In this study, taking the surrounding rocks, stress, geological environment, and service time into consideration, the safety coefficient is determined based on the vulnerability scores calculated by the vulnerability preevaluation model of the surrounding rock. Applying the safety coefficient to the instability evaluation of the composite rock-bolt bearing structure, the strength required to maintain the stability of the gateway is calculated, which further provides references and guidance to the optimization of the anchor support parameters. This method has been successfully adopted by the GuCheng coal mining project in N1303 tailgate to strengthen the anchor-bolt structure in the roof watering area especially the main inclined shaft. Applying more accurately calculated strength to the anchor-bolt structure can effectively avoid the issue of overcompensation, thus reducing the cost and increasing the driving speed. Furthermore, this method provides insights into optimizing design parameters of the gateway. This method provides a reliable basis for the optimization design of bolt support parameters in coal mine gateway.

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Bolt support mechanism based on elastic theory

Cited by 13 publications

References 2 publications

Influence of Stress Disturbance on the Deformation of Nearby Cemented Roadways following the Excavation of Chambers

Influence of Stress Disturbance on the Deformation of Nearby Cemented Roadways following the Excavation of Chambers

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

A Study of Safety Coefficient Determination and Support Parameter Optimization Based on Vulnerability Preevaluation

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