摘要
基于沿空巷道受力特征、变形机理、影响因素理论,根据薄煤层沿空留巷围岩变形特征及对巷旁支护体的力学要求,确定了首采工作面运输巷巷内工字钢棚,巷旁木垛的支护方案,并运用三维显式有限差分法软件Flac3D对巷旁木垛中心距进行了数值模拟,研究结果表明最佳木垛中心距为2.4m.该方案在本工作面运输巷进行了工程实践,经现场观测,留巷高度最低保持在1.7m左右,顶底板下沉量小于500mm,满足工程要求.该技术为薄煤层沿空留巷提供了一种新的技术途径.
The joist steel shed support in entry and wood crib support in roadside of the first working face conveyance road are determined based on stress characteristics, deformation mechanism, influencing factors and according to surrounding rock deformation features and the requirements of roadside support system. And by using FLAC3D numerical analysis, the center distance of the wood crib is determined. All that show the optimum center distance of the wood crib is 2.4 m. This schemes are tested on this working face. Through observation on spot, the minimum height of roadway is about 1.7m, and the squat of roof is less than 500 mm, which meet the engineering requirements. This technology provides a new technical way to gob-side entry retaining of thin coal seam.
出处
《矿业工程研究》
2011年第1期7-10,共4页
Mineral Engineering Research
基金
山东科技大学研究生创新基金资助项目(YCA100401)
关键词
复杂地质条件
无煤柱护巷
木垛中心距
complicated geological conditions
non chain pillar entry protection
wood crib center distance
