Experimental studies on the effects of bolt parameters on the bearing characteristics of reinforced rock

Liu, Cheng; Zhang, Yidong; Ji, Ming; Zhang, Kai; Zhang, Minglei

doi:10.1186/s40064-016-2580-z

Cited by 7 publications

(4 citation statements)

References 12 publications

(12 reference statements)

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“…For the placing density of the R-bolt, the typical pressure arch theory of bolt is adopted to confirm the number of Rbolts [38]. China) was used.…”

Section: Energy-absorbing Mechanism Of R-boltmentioning

confidence: 99%

Laboratory Testing on Energy Absorption of High-Damping Rubber in a New Bolt for Preventing Rockburst in Deep Hard Rock Mass

Yang

et al. 2018

Shock and Vibration

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With the increase in mining depth, the deep hard rock mass is under threat of rockburst under high geostress, high temperature, high osmotic pressure, and strong disturbance. To reduce the probability and strength of rockburst, a new energy-absorbing bolt for guaranteeing the stability of deep hard rock mass was developed utilizing the energy absorption characteristic of high-damping rubber. To analyze the practicability and obtain the quantified behaviors of this new energy-absorbing bolt, a series of impact tests on specimens of high-damping rubber, granite, and granite–rubber composite specimens was carried out by a split Hopkinson pressure bar (SHPB) method. Further, considering the different working depths with different rock temperatures, the dynamic energy-absorbing characteristics of high-damping rubber under different temperatures were tested. The testing results show that the new energy-absorbing bolt can consume the storage energy in host rock effectively, and the environmental temperature will produce certain effects on the energy-consuming rate. In addition, the optimal energy-absorbing thickness–diameter ratio of high-damping rubber was confirmed by SHPB tests.

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“…For the placing density of the R-bolt, the typical pressure arch theory of bolt is adopted to confirm the number of Rbolts [38]. China) was used.…”

Section: Energy-absorbing Mechanism Of R-boltmentioning

confidence: 99%

Laboratory Testing on Energy Absorption of High-Damping Rubber in a New Bolt for Preventing Rockburst in Deep Hard Rock Mass

Yang

et al. 2018

Shock and Vibration

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“…Garnered from the simulation analysis in Section 2, the roadway of Panel 11-101 had large deformations and could not be used normally; hence, bolt support was used for roadway maintenance. Bolt support can control the deformation and the failure of the surrounding rocks and maintain the integrity to the maximum in the anchor zone, thereby enhancing the strength and stability of the surrounding rocks [27,28]. Figure 5 shows a mechanical model of fractured rock with a bolt support.…”

Section: Mechanical Analysis Of Water-dripping Rock With Bolt Supportmentioning

confidence: 99%

Deformation and Control Countermeasure of Surrounding Rocks for Water-Dripping Roadway Below a Contiguous Seam Goaf

Wang

Jiang

et al. 2018

Processes

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To solve the technical problem of supporting a water-dripping roadway below contiguous seams at the Tuanbai coal mine, the deformation law of surrounding rocks for the roadway was studied using Fast Lagrangian Analysis of Continua in Three Dimensions (FLAC3D) numerical simulation. Then, a mechanical model of water-dripping rock using a bolt support was established, and further, technical countermeasures to control the deformation of the roadway with a bolt and cable support are proposed. The results show that the erosion of the water dripping on the roadway was substantial and showed notable changes over time during roadway excavation and mining work. These effects caused the road to heave slightly, but it tended to be stable during roadway excavation. Moreover, the erosion of the roof and two ribs increased exponentially, and the floor heave increased with significant displacement oscillation during mining. The anchoring length of bolts and the rock weakening from water dripping had noticeable effects on the surrounding rocks of the roadway. The logical parameters of the bolt spacing and tightening force (the bolt line spacing was 0.7-0.9 m and the tightening force exceeded 40 kN) of the bolt supports were studied and optimized. Finally, a support scheme for water dripping on the roadway at the Tuanbai coal mine is proposed. The observation data regarding the deformation of the surrounding rocks, monitoring of bolt and cable stress, endoscopy results of roof failure, and roof bed separation monitoring were used to verify the reasonableness of the scheme and ensure the requirements for support were met. The study results can serve as a reference regarding the support for water dripping on a roadway under similar conditions.

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“…As a simple active support method, the bolt-supporting technology has been widely studied and applied in various mine roadway support [ 1 , 2 , 3 , 4 ]. During the service life of the bolt-supported roadway, the real-time and accurate monitoring of its working conditions is of great significance to the normal maintenance of the roadway and the safe production of the mine.…”

Section: Introductionmentioning

confidence: 99%

Structural Design and Application of Desensitized FBG Force-Measuring Bolt

Liang

Yang

Fang

et al. 2022

Sensors

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Bolt-supporting technology has been widely used in mine roadway support, and its own working conditions have important reference value for roadway safety support. In order to realize the continuous and reliable monitoring of the bolt rod’s working condition, this paper analyzes the existing problems of the existing fiber Bragg grating force-measuring bolt (FBG-FMB), and proposes a fiber grating strain desensitization sensing theory. Based on this theory, a desensitized FBG-FMB is developed with the spring as the elastic sensitive element. A mechanical analysis and drawing test show that the strain of the force-measuring bolt is greater than 60 times the micro-strain of the fiber grating, which verifies the feasibility of the structure design of the FBG-FMB. Finally, through the field application in the coal mine roadway, the working conditions of the bolt body at the two measuring points of the roadway are obtained to verify the reliability of the force-measuring bolt. In addition, the desensitized FBG-FMB can be widely used in the supporting fields of underground engineering such as slopes, tunnels, and foundation pits.

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Experimental studies on the effects of bolt parameters on the bearing characteristics of reinforced rock

Cited by 7 publications

References 12 publications

Laboratory Testing on Energy Absorption of High-Damping Rubber in a New Bolt for Preventing Rockburst in Deep Hard Rock Mass

Laboratory Testing on Energy Absorption of High-Damping Rubber in a New Bolt for Preventing Rockburst in Deep Hard Rock Mass

Deformation and Control Countermeasure of Surrounding Rocks for Water-Dripping Roadway Below a Contiguous Seam Goaf

Structural Design and Application of Desensitized FBG Force-Measuring Bolt

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