摘要
针对煤巷顶板煤岩的复杂性及顶板岩层破坏难以有效控制、预测问题,考虑钻头与煤岩相互作用产生耦合振动,通过分析锚杆钻头的受力及其振动特性,以煤岩硬度f=4.2,3.5,2.55为例研究钻削机构钻削完整岩石与破碎岩石时的耦合振动特性。利用最小二乘法原理拟合振动曲线,消除趋势项,并对曲线进行平滑处理。研究表明:在相同钻削条件下随煤岩硬度的增加,钻削机构横向振动半径有所增大;钻削相同硬度煤岩的完整岩石和破碎岩石时钻削机构横向振动半径随煤岩破裂程度的增加而减小。可据此来判断煤巷锚孔内煤岩破碎的范围,进而预测顶板是否存在冒顶隐患及冒顶隐患的程度,亦可据此判断煤巷锚孔内稳定岩层的位置和厚度,为顶板支护参数的设计提供技术支持。
To solve the problems in control and prediction of roof strata caused by the complexity of coal mine roof, the coupling vibration characteristics of drilling different types of rock （intact and frac- tured, hardness coefficient f=4.2, 3.5 and 2.55） have been studied through the analysis of loading and vibration state of bolt drill with consideration of interacting vibration between rock and drill. The least square method is employed for fitting and smoothing the vibration curve, and eliminating trend terms. The results have shown that under the same drilling condition, the horizontal vibrating radius increases with the increase of rock hardness; for the same type of rock, the horizontal vibrating decreases with the increase of fracturing intensity. The fracture scope of roof can be estimated by presented results, and hereby used for predicting caving danger, along with the position and thickness of stable roof stratum, which can provide technique support for roof support design.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2016年第5期911-916,共6页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2011CB201204)
国家自然科学基金重点项目(51234005)
关键词
振动响应
钻削机构
最小二乘法
完整岩石
破碎区
vibration response： drill
least square method： intact rock
fracture zone
作者简介
郭书英（1980-），女，河北省邯郸市人，讲师，博士，从事矿山压力与巷道支护等方面的研究。E-mail：syg2007@126．com Tel：13321181159
