Compression-shear behavior of high-resistance backfill walls in gob-side entry retaining for thick seams
Lei Sun, Fan Qiao, ShuaiShuai Jiang, Chong Li · 2026
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Description
Lei Sun, with three colleagues, reports a 2026 study of fill walls that hold up a coal mine entry as the seam beside it is dug out. In thick seams under hard roofs, these walls can tilt or fail when pressure sheds unevenly. The team built a new test rig that presses and shears samples at once, with fast strength build-up and varied tilt angles.
Peak strength fell as the shear share rose, and failure shifted from crushing toward sliding. A formula linked wall width to roof sag. The high-strength fill then went into a real mine face, with a design to stop tilting. Measured roof sag came in 59.4 percent below the forecast value, and the wall showed no clear damage. The results give design data for mines in like conditions.
Catalog record
| CREATOR | Lei Sun, Fan Qiao, ShuaiShuai Jiang, Chong Li |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 64477 |
| LICENSE | https://creativecommons.org/licenses/by/4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |