Study on the Stability Principle of Mechanical Structure of Roadway with Composite Roof

Yu, Yang; Lu, Jian‐Fei; Chen, Dingchao; Yi-shan, Pan; Zhao, Xin; Zhang, Lianying

doi:10.3390/min11091003

Cited by 9 publications

(9 citation statements)

References 23 publications

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“…Li 16 studied the instability mechanism of soft rock composite layered roof through theoretical analysis. Yu 17 derived the deflection of each layer of the composite roof based on the infinite-length plate theory and determined the critical load discriminant of each layer. Xie 18 studied the support principle of compound roof roadway based on the energy balance theory.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…Affected by the formation age, the coal measure strata are mainly sedimentary strata, which determines the widespread existence of composite roof in the coal roadway. The composite roof coal roadway is subject to multiple dynamic pressure disturbances during the whole service period and is prone to uncoordinated deformation under multiple stresses or groundwater due to the large difference in rock properties [1][2][3]. It further induces stratification and even leads to overall roof rupture, support failure, and roof collapse, bringing a great challenge to roadway safety maintenance and control [4,5].…”

Section: Introductionmentioning

confidence: 99%

Instability Mode and Control Technology of Surrounding Rock in Composite Roof Coal Roadway under Multiple Dynamic Pressure Disturbances

et al. 2022

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In view of the problems of composite roof coal roadway under multiple dynamic pressure disturbances such as strong stratification, large deformation of the roadway surrounding rock, and poor safety and reliability, this paper analyzed the deformation and instability characteristics of composite roof coal roadway under different influencing factors using numerical simulation and expounded the stress distribution pattern of composite roof coal roadway under multiple dynamic pressure disturbances. The geological conditions of gas control roadway in the 22301 working face of Tunlan coal mine are taken as examples, and this study is carried out based on the analysis of roof instability conditions of composite roof coal roadway. The progressive crack development characteristics in composite roof coal roadway and the instability failure mode of surrounding rock under multiple dynamic pressure disturbances were revealed, and the control mechanism and support scheme were put forward. According to the result, it is difficult to form a stable bearing rock beam due to the occurrence characteristics of the weak interlayer of the composite roof. The deflection of the roadway roof and the extent of the plastic zone are negatively correlated with the distance from the soft rock layer to the roadway but positively correlated with the thickness of the soft rock layer. As the lateral pressure coefficient λ increases, the plastic zone of the roadway surrounding rock first decreases and then increases. With the increasing influence of dynamic pressure, the coal roadway with composite roof suffers from greater damage under the superposition of high ground stress, lateral abutment pressure, and advance abutment pressure, which is characterized by significant zonal failure of the roof and asymmetric failure of surrounding rock. The control method of high-strength thick anchorage + differential support can construct the thick layer stable rock beam of the roof and equivalent support of the side, realizing continuous stress transfer and geometrically coordinated deformation. The support scheme was finally applied to the on-site industrial test, and the mine pressure monitoring results showed that the deformation of the roadway surrounding rock was effectively controlled under the new support scheme.

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“…Because large deformation or flowing deformation of the surrounding rock can lead to the failure of the roadway and the working environment becomes unsafe, coal mining is not able to continue. Thus, numerous investigations on the stability control technology and support schemes of the surrounding rock of coal mine roadways were performed by researchers and engineers, and lots of beneficial correction theories and technologies were also proposed by them, such as full-stress anchoring technology and bolt support [10][11][12][13][14]. However, relatively few studies on hybrid full-space synergy technology and the application of bolts based on the orthogonal experimental method have been launched for the roadway optimization design of mining fields in deep soft rock.…”

Section: Introductionmentioning

confidence: 99%

Analytical Approach Based on Full-Space Synergy Technology to Optimization Support Design of Deep Mining Roadway

Zhang

Yin

2022

Minerals

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The stability of surrounding rock is the basic guarantee of underground space engineering safety. The large deformation of a roadway’s surrounding rock is a very common phenomenon during the underground excavation of coal mine roadways or coal mining, especially in deep soft rock mining roadways. With the increase in mining depth and mining stress, it is very important to prevent disasters caused by surrounding rock deformation. This work aims to conduct an optimization design of roadway support for deep soft rock in coal mines using a full-space synergy control technology. FLAC3D-based orthogonal numerical experiments are adopted to study the influence of bolt parameters and plastic yield zone variation on the deformation of roadway surrounding rock, which provides a basis for optimizing the support design of coal mine roadways. According to the results of the numerical analysis, the optimal support parameters are determined as 20 mm, 2.2 m and 700–900 mm for diameter, length and interval of the bolt, respectively. Finally, the determined bolt-shotcrete net beam support scheme from the full-space synergy control idea is used in a study case. Results illustrate that this study can provide reliable guidance for the stability control of deep soft rock roadways in mining fields under high stress, and it can work well to keep the surrounding rock deformation within the safe limits.

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Study on the Stability Principle of Mechanical Structure of Roadway with Composite Roof

Cited by 9 publications

References 23 publications

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

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

Instability Mode and Control Technology of Surrounding Rock in Composite Roof Coal Roadway under Multiple Dynamic Pressure Disturbances

Analytical Approach Based on Full-Space Synergy Technology to Optimization Support Design of Deep Mining Roadway

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