Failure mechanism of bolting support and high-strength bolt-grouting technology for deep and soft surrounding rock with high stress

Li, Shucai; Wang, Hongtao; Wang, Qi; Jiang, Bei; Wang, Fuqi; Guo, N.B.; Liu, Wenjiang; Ren, Yi

doi:10.1007/s11771-016-3089-x

Cited by 64 publications

(24 citation statements)

References 15 publications

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“…The state of surrounding rock has great influence on the supporting effect of the pretension bolt. Li investigated the bond strength on the interface between the bolt anchorage zone and the surrounding rocks, which can be written as [22]…”

Section: Methodology 31 Engineering Backgroundmentioning

confidence: 99%

“…He pointed out that the alternately occurring of fracture zone and crack zone in surrounding rock is one of the internal causes for the instability of the roadway, and a new design with detailed parameters was proposed. Based on the soft rock roadway with high stress in a deep coal mine, Li et al [22] concluded that the frequent failures of bolt support are closely related to the lower bond strength. The anchoring force of bolt on surrounding rocks can be improved with the increase of bond strength.…”

Section: State Of the Artmentioning

confidence: 99%

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Failure Mechanism of Bolts and Countermeasures in Swelling Soft Rock Support

Guo¹,

Zhang

Wang

et al. 2018

Teh. vjesn.

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The effect of conventional bolt support is not ideal due to the large deformation character of soft rock. As an innovative bolt, constant resistance large deformation (CRLD) bolt has been successfully applied to swelling soft rock engineering, but the reinforcement mechanism is not yet clear. To investigate the interaction mechanism between bolt and surrounding rock, Nanshan Coal Mine of China was selected as the engineering background. The plastic zone of surrounding rock mass and the axial force of three bolts were obtained by theoretical analysis and FLAC3D numerical simulation. Failure processes of conventional pretension bolts in soft rock were reproduced, and the interaction between CRLD bolt and soft rock was investigated in comparison. The results indicate that: (1) The fracture zone of surrounding rock exceeds the anchorage range of the low pretension bolt, the bolt slides with surrounding rock and finally fails.(2) The fracture zone of surrounding rock does not exceed the anchorage range of the high pretension bolt. However, with the accumulation of deformation energy, stress concentration makes the bolt break. (3) CRLD bolt can effectively absorb the deformation energy released by soft rock and maintain constant support resistance. The conclusions obtained in this study provide significant references in the selection of bolts in soft rock engineering.

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Section: Methodology 31 Engineering Backgroundmentioning

confidence: 99%

Section: State Of the Artmentioning

confidence: 99%

Failure Mechanism of Bolts and Countermeasures in Swelling Soft Rock Support

Guo¹,

Zhang

Wang

et al. 2018

Teh. vjesn.

View full text Add to dashboard Cite

show abstract

“…Specifically, the time-dependent feature of rock mass (i.e. rheology property) in deep conditions is more severe [3,4]. After roadway excavation, the deformation of the roadway with weak rock mass and soft coal mass rapidly increases with time, which causes the evolutionary failure of the roadway.…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanisms of Rheological Coal Roadway

Sun

Zhang

et al. 2020

Sustainability

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The roadway instability in deep underground conditions has attracted constant concerns in recent years, as it seriously affects the efficiency of coal mining and the safety of personnel. The large rheological deformations normally occur in deep roadway with soft coal mass. However, the failure mechanism of such roadways is still not clear. In this study, based on a typical soft coal roadway in the field, the in-situ measurements and rock mass properties were obtained. The rheological deformation of that roadway was revealed. Then a time-dependent 3D numerical model was established and verified. Based on the verified model, the deformation properties and evolutionary failure mechanism of deep coal roadway were investigated in detail. The results showed that the deformation of the soft coal roadway demonstrated rheological behavior and the applied support structures failed completely. After roadway excavation, the maximum and minimum stresses around the roadway deteriorated gradually with the increase of time. The failure zones in soft coal mass expanded increasingly over time, which had a negative effect on roadway stability in the long-term. According to the findings, helpful suggestions were further presented to control the rheological deformation in the roadway. This research systematically reveals the instability mechanism of the deep coal roadway and provides some strategies for maintaining roadway stability, which can significantly promote the sustainability of mining in deep underground coal mines.

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“…Experts have conducted intensive research on the mechanism of bolt support. For instance, Li et al established the calculation theory for the interfacial bond strength between the anchor agent and the roadway-surrounding rock and analyzed the influence of different interfacial bond strengths on the control of roadway-surrounding rock [10]. Based on the simplified anchor model, Shang et al performed numerical simulations combined with laboratory tests to study the microscopic and macroscopic shear failure mechanisms of fully grouted steel anchors and analyzed the anchor-anchor shear strength and failure mode of the interface.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Supporting Effect of Anchor Rods on Layered and Nonlayered Roof Rocks

Che

Fan

Cui

et al. 2020

Advances in Civil Engineering

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In order to clarify the influence of anchor bolts on the supporting effect of the layered weak roof and surrounding rock of nonlayered roof with good integrity, the mechanical model of the roadway with nonlayered homogeneous roof and layered weak roof was established using FLAC3D. The distribution characteristics of the stress field and the displacement field of the bolt support are analyzed, and the supporting effect of the bolt on the roof of two types of roadways is studied. The research results show that when the original rock stress is not considered, the bolt support shows obvious tensile, compressive stress areas and positive and negative displacement areas in the surrounding rock of the roof of the roadway; when the original rock stress is taken into account, the tensile and compressive stress zones and the positive and negative displacement zones of the anchor support in the surrounding rock of the roof plate disappear obviously. The effect of the bolt support on the stress field and plastic area of the surrounding rock of the two types of roadway roof is not obvious. However, it has a significant effect on suppressing discontinuous deformation such as delamination and sliding between layered roof rocks. The delamination phenomenon between rock layers disappeared obviously, and the range of each numerical curve of the displacement field of the surrounding rock in the anchoring area was significantly reduced. However, the effect of the anchor support on continuous deformation control such as elastoplastic deformation of roof rock of nonlayered roadway is very limited. There is almost no change in the displacement field curve in the depth of the roof-surrounding rock. Only the shallow surrounding rock displacement field curve range has decreased.

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Failure mechanism of bolting support and high-strength bolt-grouting technology for deep and soft surrounding rock with high stress

Cited by 64 publications

References 15 publications

Failure Mechanism of Bolts and Countermeasures in Swelling Soft Rock Support

Failure Mechanism of Bolts and Countermeasures in Swelling Soft Rock Support

Failure Mechanisms of Rheological Coal Roadway

Numerical Simulation of the Supporting Effect of Anchor Rods on Layered and Nonlayered Roof Rocks

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