敏东一矿厚顶煤软岩巷道支护参数设计

Design of Support Parameters for Thick Rock Soft-rock Roadway in Mindong No.1 Mine

为解决敏东一矿直墙半圆拱形断面掘进速度慢且无法配合掘锚一体机使用的问题,急需将巷道断面设计修改为矩形。基于I0216301运输顺槽厚顶煤软岩地质条件,分别采用弹塑性法、压力拱法、现场实测和数值模拟研究确定采用矩形断面时顶板最大破坏范围,分别为2.53 m、2.87 m、2.40 m和2.45 m,最终以压力拱计算数据做为参考,考虑2倍安全系数下,提出使用“19芯φ17.8 mm×8300 mm锚索+φ20 mm×2500 mm左旋等强螺纹钢式锚杆+金属网+钢带”联合支护的支护方案。

In order to solve the problem that the straight wall semi-circular arch section of Mindong No.1 Mine has a slow boring speed and cannot be used with the excavating and anchoring machine,it is urgent to modify the roadway section design to rectangular.Based on the geological conditions of I0216301 transporting thick soft coal along the trough,the elastoplastic method,pressure arch method,field measurement and numerical simulation were used to determine the maximum damage range of the roof when the rectangular section was used,which were 2.53 m,2.87 m,2.40 m,and 2.45 m,finally taking the pressure arch calculation data as a reference,considering 2 times the safety factor,it is proposed to use"19 coreφ17.8×8300 mm anchor cable+φ20×2500 mm left-handed and other strong rebar steel anchor+metal mesh+steel belt"Support plan for joint support.