关键词: 回采巷道, 锚杆支护, 浅埋深, 预应力, 锚杆间排距, 半煤岩巷道

Abstract: Based on No.5 coal seam of Changxing coal, the parameters optimization of bolting in mining coal-rock roadway under shallow overburden have been studied by using numerical simulation and underground test. The supporting effect of three different programs have been contrastively analyzed by FLAC3D, and a reasonable bolting row & line space was determined. The research show that: bolt density can be reduced by increasing bolting pretensioned stress; when the pretensioned stress is 30~50% of bolt yield stress, the bolting row & line space can increase from 0.8~1.0m to 1.0~1.2m for the mining coal-rock roadway under shallow overburden. Underground test show that：a value of 1.2m is reasonable for the bolting row & line space in Changxing coal, and it can guarantee roadway safety.

Key words: mining roadway, bolting, parameters optimization, pretensioned stress, row &, line space