Abstract
Aiming to advance a support problem for roadways used with the longwall coal mining method, the S1202 working face of the Ningtiaota Coal Mine is taken as the engineering background. The monitoring and analysis of bolt force, anchor cable force and surrounding rock deformation of two types of roadways within the whole advance pressure influence range are carried out in the present paper. Based on this, a numerical calculation model consistent with the field is established, and numerical comparison tests under different influencing factors are carried out. The rationality of the numerical test results is verified by using the field monitoring data. At the same time, quantitative evaluation indexes, such as characterization deformation, are established, and the deformation law of roadways surrounding rocks under different advance passive support forces is analyzed. The advance support mechanism of the roadway used with the longwall coal mining method is clarified. The test shows that under the condition of no advance passive support, the maximum characteristic deformation of surrounding rock in the haulage roadway and ventilation roadway is 7.1 cm and 10.1 cm, respectively. The above surrounding rock deformation still meets the requirements of on-site safety production. The research results can provide experimental support for the advance support parameters of the roadway used with the longwall coal mining method.
Highlights
Coal is an important consumer energy in the world, accounting for 27% of the global primary energy consumption structure in 2019
In the process of coal mining, the roadway surrounding rock in a certain range in front of the coal mining face is affected by the superposition of mining stress and in situ stress
The results show that with the decrease in the advance support force, the advance influence pressure on the roof of the haulage roadway is more obvious
Summary
Coal is an important consumer energy in the world, accounting for 27% of the global primary energy consumption structure in 2019. Longwall mining method is widely used around the world due to its high productivity and good ventilation performance This mining method [1,2,3,4,5,6,7] needs to excavate two mining roadways in advance and reserve one roadway pillar to mine one working face. The maximum value of the roof and floor convergence deformation is 8.9 cm, andCtohnevecrognenvceerdgeefonrcmeadtioenfos ormf thaetitowno soidfetshoef above data show that the deformation v2esnitdilaetsioinsr7o.a6dwcmay in the ventilation of the roadway surrounding rock rcoaandwmaey6e.t. The the requirements of safety production during the service period of the whole working face. KN, so its strength utilization rate is 10.0% and 13.8%, respectively. 2 In terms of the cable force: within 18.7 m to 0 m in advance (−18.7 m~0 m), the
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