摘要
基于掘进工作面配巷回采条件,采用FLAC数值模拟方法,对不同的支护方案进行对比,确定最优的支护方案参数。研究表明:(1)基于FLAC3D数值模拟分析可知,在顶板布设3根锚杆条件下,锚杆间排距在1000~1200 mm时,围岩-锚杆体系的受力区域存在锚固盲区;锚杆间排距在800~900 mm时,单锚的自由段与锚固体的应力场相互叠加,承载能力充分发挥,但顶板两肩预应力覆盖影响范围弱,需要进一步优化支护方式。(2)基于FLAC3D数值模拟分析可知,在顶板布设4根锚杆条件下(间距≤900 mm),单根锚杆锚固端与自由端之间的预应力叠加几乎将悬顶部位覆盖,锚杆间的预应力盲区几乎被取代,支护效果良好。(3)对比数值模拟计算结果,当锚杆间排距由900 mm减小到800 mm时,预应力扩散作用的增强效应并不显著;800 mm的间距过密,造成了材料浪费和经济损伤。因而,玻璃钢锚杆合理间排距为:900 mm×900 mm(单排4根)。
Based on the mining conditions of the roadway in the excavation face,the FLAC numerical simulation method is used to compare different support schemes and determine the optimal support scheme parameters.Research has shown that:(1)Based on FLAC3D numerical simulation analysis,it is known that under the condition of deploying three anchor rods on the roof,when the spacing between anchor rods is between 1000~1200 mm,there is an anchoring blind zone in the stress area of the surrounding rock anchor rod system;When the spacing between anchor rods is between 800~900 mm,the stress field of the free section of a single anchor and the anchor body are overlapped,and the bearing capacity is fully utilized.However,the influence range of the prestressed coverage on the two shoulders of the top plate is weak,and further optimization of the support method is needed.(2)Based on FLAC3D numerical simulation analysis,it can be concluded that under the condition of deploying 4 anchor rods on the top plate(with a spacing of≤900 mm),the superposition of prestress between the anchoring end and the free end of a single anchor rod almost covers the suspended top part,and the blind zone of prestress between the anchor rods is almost replaced,resulting in good support effect.(3)Compared with the numerical simulation results,when the spacing between anchor rods decreases from 900 mm to 800 mm,the enhancement effect of prestressed diffusion is not significant;The spacing of 800 mm is too dense,resulting in material waste and economic damage.Therefore,the reasonable spacing between fiberglass anchor rods is 900 mm×900 mm(single-row,4 anchor rods).
作者
高玉柱
刘玉德
Gao Yuzhu;Liu Yude(Huangbaici Coal Mine of Wuhai Energy,National Energy Group,Inner Mongolia,016000;Mining Safety College of North China University of Science and Technology,Hebei,065201)
出处
《当代化工研究》
CAS
2024年第11期30-32,共3页
Modern Chemical Research
关键词
工作面配巷
玻璃钢锚杆
支护参数优化
数值模拟
working face roadway allocation
FRP anchor rod
optimization of support parameters
numerical simulation
