Abstract
The floor heave problem is one of the important factors affecting the stability and safety of surrounding rocks of roadways, especially in deep high-stress mining roadway with soft rock. The return airway of no. 130203 working face in Zaoquan Coal Mine of Ningdong Mining Area in Northwest China is the research object in this study. Firstly, an innovative “relief-retaining” control scheme of floor heave is proposed, which is the comprehensive measure of “cutting groove in floor + drilling for pressure relief at roadway side + setting retaining piles at the junction of roadway side and floor.” Then, the specific parameters suitable for floor heave control of no. 130203 return airway are determined using numerical simulation method. Finally, the yield monitoring results show that both the deformation of surrounding rocks and the cable force are significantly reduced. The roof falling capacity, floor heave displacement, and thickness increasing value of 0–2 m floor strata are 596 mm, 410 mm, and 82 mm, respectively, which are 43.67%, 67.49%, and 75.38% less than those of the control section. The maximum force of cables at roadway sides is 140.13 kN, about 32.54% less than that of the control section. The results verify the reliability of the proposed “relief-retaining” control scheme and can provide some reference for the floor heave control of similar roadways.
Highlights
After excavation of mining roadway, the phenomenon of upward heave of roadway floor is called floor heave
Wang et al [10] studied the floor heave control method of high-stress soft rock roadway, took the triple roadway of the main belt conveyor roadway in the west wing of Panyidong Mine as the research object, and proposed the floor heave control scheme based on end anchor cable bundle, which provided solutions and ideas for the floor heave problem of high-stress soft rock roadway
Is section takes the geological and mining conditions of no. 130203 return airway in Zaoquan Coal Mine as the background, adopts FLAC3D numerical software, selects no. 130203 working face as the engineering prototype, and selects the length of X horizontal direction 200 m, the length of Y horizontal direction 50 m, and the length of Z vertical direction 150 m to establish the numerical calculation model. e coarse sandstone is the upper boundary of the model, and the medium sandstone is the lower boundary of the model. e strata from top to bottom are coarse sandstone, siltstone, coal, mudstone, fine sandstone, and
Summary
After excavation of mining roadway, the phenomenon of upward heave of roadway floor is called floor heave. In order to control the floor heave problem effectively, many scholars have conducted a lot of exploration, and many floor heave prevention and control technologies are proposed. Many scholars have done a lot of research on floor heave control, mainly focused on the aspects of reducing surrounding rocks stress [14,15,16,17] and increasing floor integrity [18,19,20,21,22,23], and achieved good control results. E method of floor heave control suitable for high-stress roadway with soft rock needs further exploration, especially in Ningdong Mining Area. Based on the typical large deformation roadway with soft rock in Zaoquan Coal Mine of Ningdong Mining Area, this paper puts forward the innovative “relief-retaining” control scheme of floor heave, and the specific parameters suitable for floor heave control of no. Field monitoring results verify the reliability of the proposed “relief-retaining” control scheme and can provide some reference for the floor heave control of similar roadways
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