Analysis of Influence Law of Burial Depth on Surrounding Rock Deformation of Roadway

Wu, Hai; Wang, Xiaokang; Yu, Wenxin; Zhang, Zizheng; Gang, Peng

doi:10.1155/2020/8870800

Cited by 7 publications

(5 citation statements)

References 2 publications

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“…e rock B fracture position and rotating speed are closely related to the pillar width. According to the ultimate balance theory, the geometry size l of rock B can be derived from the panel dip length S and periodic breakage length L of the main roof, as in the following formula [40,41]:…”

Section: Discussion Of the Rational Width For A Protective Pillarmentioning

confidence: 99%

Numerical Analysis of the Width Design of a Protective Pillar in High‐Stress Roadway: A Case Study

et al. 2021

Advances in Civil Engineering

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The width design of protective pillars is an important factor affecting the stability of high-stress roadways. In this study, a novel numerical modeling approach was developed to investigate the relationship between protective pillar width and roadway stability. With the 20 m protective pillar width adopted in the field test, large deformation of roadways and serious damage to surrounding rocks occurred. According to the case study at the Wangzhuang coal mine in China, the stress changes and energy density distribution characteristics in protective pillars with various widths were analysed by numerical simulation. The modeling results indicate that, with a 20 m wide protective pillar, the peak vertical stress and energy density in the pillar are 18.5 MPa and 563.7 kJ/m3, respectively. The phenomena of stress concentration and energy accumulation were clearly observed in the simulation results, and the roadway is in a state of high stress. Under the condition of a 10 m wide protective pillar, the peak vertical stress and energy density are shifted from the pillar to roadway virgin coal region, with peak values of 9.5 MPa and 208.3 kJ/m3, respectively. The decrease in vertical stress and energy density improves the stability of the protective pillar, resulting in the roadway being in a state of low stress. Field monitoring suggested that the proposed 10 m protective pillar width can effectively control the large deformation of the surrounding rock and reduce coal bump risk. The novel numerical modeling approach and design principle of protective pillars presented in this paper can provide useful references for application in similar coal mines.

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Section: Discussion Of the Rational Width For A Protective Pillarmentioning

confidence: 99%

Numerical Analysis of the Width Design of a Protective Pillar in High‐Stress Roadway: A Case Study

et al. 2021

Advances in Civil Engineering

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“…Research shows that there is an optimal grouting opportunity for grouting in dynamic stress roadway surrounding rock [22][23][24][25]. If the grouting is carried out too early, an effective grouting diffusion path has not been formed inside the surrounding rock, and the reinforcement effect will be poor.…”

Section: Grouting Opportunitymentioning

confidence: 99%

Grouting Technique for Gob‐Side Entry Retaining in Deep Mines

Sun

Deng

et al. 2021

Advances in Civil Engineering

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The retained rib displacement accounts for roughly 80% of rib-to-rib convergence in gob-side entry retaining in deep coal mines, which shows significant nonsymmetrical feature and long-term rheological phenomenon. Affected by mining-induced stress, cracks spread widely, and broken zones expand beyond the anchoring range. Without grouting and supplementary support in retained rib, the surrounding rock-support load-bearing structure will be in a postpeak failure state, and the anchoring force of the bolting system will be greatly attenuated. After grouting, the compressive strength of grouting geocomposite specimen is significantly higher than the postpeak residual strength of the intact coal specimen, and it is partially restored compared to that of the intact coal specimen. The ductility of the fractured coal specimen increases after grouting, and it has stronger elasticity and plasticity. Broken rock block can become a whole with coordinated bearing capacity, and its stability is improved after grouting. The grouting technique could restore the integrity and strength of the fractured retained coal rib, repair the damaged bolting structure, and make the surrounding rock and supporting structure become an effective bearing structure again. The research result shows that it is feasible to restore the bearing capacity of the retained coal rib by grouting technique.

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“…With the high-intensity mining of coal in recent years, the rock burst has also been widely emphasized due to its characteristics such as suddenness and disastrousness 1 . Numerous studies have shown that geological structures are often accompanied by stress concentration 2 , 3 , which is easier to induce rock burst accidents 4 , 5 . The fault is a common geological structure, because of the characteristics of severe fragmentation and complex lithology, during the mining, mining stress, and tectonic stress superposition.…”

Section: Introductionmentioning

confidence: 99%

Research on dynamic response characteristics of normal fault footwall working face and rock burst prevention technology under the influence of the gob area

Tai,

Li,

et al. 2023

Sci Rep

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To study the effect of mining dynamic response characteristics on the footwall working face of the normal fault under the influence of the gob area, theoretical research, indoor experiment, and numerical simulation are adopted to analyze the stress manifestation characteristics, overburden movement, and energy evolution characteristics during the process of mining. The results show that: (1) In the process of mining toward the fault, the working face shows the change characteristics of “stable-activation mutation-final stability”. At 20 m from the fault, the arch structure of the working face was damaged, fissures appeared near the high fault fracture zone, and the displacement of the overburden rock increased significantly; (2) the maximum value was reached at 4–8 m from the coal wall, and the superposition of tectonic stress and mining stress led to the concentration of the stress and energy accumulating on the top plate near the fault, and the data close to the gob area were even larger; (3) If the plastic damage zone of the high-level rock layer on the hanging wall and footwall of the fault appears to have a wide range of penetration, and the area formed between the shear displacement curve of the fault plane and the X-axis appears to have a significant enhancement, it is considered that the fault has been activated; (4) The size of the coal pillar of the fault is determined to be 40 m, and combined with the pressure unloading technique of the variable-diameter drilling hole, the validation is carried out through the micro-vibration monitoring, and the results of which can be used as a reference for the safety of the working face under similar conditions.

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Analysis of Influence Law of Burial Depth on Surrounding Rock Deformation of Roadway

Cited by 7 publications

References 2 publications

Numerical Analysis of the Width Design of a Protective Pillar in High‐Stress Roadway: A Case Study

Numerical Analysis of the Width Design of a Protective Pillar in High‐Stress Roadway: A Case Study

Grouting Technique for Gob‐Side Entry Retaining in Deep Mines

Research on dynamic response characteristics of normal fault footwall working face and rock burst prevention technology under the influence of the gob area

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