Rational Layout of Roadway for Downward Cross-Pillar Mining in Close Distance Coal Seams

doi:10.12068/j.issn.1005-3026.2023.01.014

Abstract

Abstract: Meiyukou coal mine was taken as engineering case to explore the influence of remnant coal pillar on the layout of underlying roadway. The maximum principal stress concentration coefficient was used to identify the concentrated stress zone in the floor. The evolution characteristics of concentrated stress zone in the floor at different mining stages were studied by means of theoretical analysis， programming calculation and numerical simulation. The results show that the width and the buried depth of pillar， the distance from edge of pillar to peak zone and the peak value of vertical stress control the development of concentrated stress zone in the floor. The influence of stress recovery characteristics of goaf on the concentrated stress zone can be ignored. Comparing the peak value of the influence range of concentrated stress zone on the lower coal seam and the staggered distance between coal pillar and roadway in each simulation scheme， and combining with the gradual recovery of stress in the goaf and the regionalization characteristics of ground pressure in longwall face， it is considered that the reasonable staggered distance range is 10~15m. Choosing staggered distance of 12m for industrial test has achieved good application effect.

Key words: close distance coal seams; downward mining; remnant coal pillar; stress recovery of goaf; high floor stress caused by coal pillar

CLC Number:

TD323

WANG Hong-bo， ZHANG Yong， PANG Yi-hui. Rational Layout of Roadway for Downward Cross-Pillar Mining in Close Distance Coal Seams[J]. Journal of Northeastern University(Natural Science), 2023, 44(1): 100-109.

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