Thickness and Strength Analysis of Prestressed Anchor (Cable) Compression Arch Based on Safe Co-Mining of Deep Coal and Gas

The stability of the gas extraction roadway is very important for safe mining coal and gas. compression arch formed by combined action prestressed bolt (cable) support surrounding rock has been widely used in engineering practice roadway. It great application value to analyze influence parameters on arch. In this paper, with deep Huainan Huaibei area Anhui Province, mechanical are measured via field coring laboratory. numerical simulation software FLAC3D typical position fractured mudstone, sandy mudstone muddy sandstone under pre-tightening force F = 50 kN, 70 kN 100 kN; spacing a × b 400 mm mm, 500 600 mm; length L 1500 2000 2600 3000 distribution characteristics additional compressive stress surface side. different lithology thickness strength was analyzed, basis, anchor cables 80 120 4000 6000 were applied, their analyzed. results show that (F) (L) have significant effect arch, while lithology, (a b), cable no obvious (F), (L),