Abstract
Large deformation of roadway and floor burst are the two major geotechnical hazards encountered with high mining stress in deep mines. In this paper, the stress and energy conditions generated by the impact damage on the rock surrounding a roadway are analyzed, and UDEC software was used to study the deformation characteristics of the roadway, as well as its failure mechanism under the influence of superimposed dynamic and static loads. The results indicate that the soft floor of a deep-buried roadway has a high damage degree and an obvious stress release effect, high static load leads to slow floor heave, and strong dynamic load disturbance is the principal trigger leading to floor burst. In addition, the anisotropy caused by the bedding surface weakens the cooperative characteristics of the support system, resulting in serious instability of the whole rock surrounding the roadway. Full-section anchor cables and inverted arches were adopted to maintain the stability of the rock surrounding the roadway. The monitoring results obtained from field tests show that the adoption of the combined support system effectively avoids floor burst caused by the superposition of dynamic and static loads; the maximum floor heave is 67.9 mm, which is 95% lower than the original value, ensuring safety in coal mining operations.
Highlights
Sufficient support strength of the ribs and the floor are the main reasons for the rock burst of the floor
(2) In the environment dominated by high static load in the near field, fractures in the surrounding rock developed and strength was reduced; under the influence of the lateral stress of mining, the deformation of the surrounding rock increased; with the
In the environment dominated by high static load in the near field, fractures in the surrounding rock developed and strength was reduced; under the influence of the lateral stress of mining, the deformation of the surrounding rock increased; with the action of dynamic load disturbance in the far field, the impact damage on the soft rock of the roadway floor was serious
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Dou et al [17] theoretically analyzed the energy and stress conditions of rock burst and put forward the principle of floor burst induced by the superposition of dynamic and static loads. Given the seriously damaged mudstone floor in the No −830 roadway of Zhangshuanglou coal mine, this manuscript puts forward a combined support technology characterized by the usage of cables and combined arched girders It aims to avoid floor burst by first adopting anchor cables to maintain the stability of the floor and ribs. The application shows that the combined support technology has a significant effect on floor burst control in deep and high-stress roadway, which is beneficial to the improvement of mining productivity
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