摘要
任家庄煤矿110508回风巷上覆为110308工作面采空区及其上侧正在回采的110506工作面。受上覆遗留煤柱集中应力和上侧回采工作面采动影响,110508回风巷最大底鼓量达到1 200 mm。为解决巷道底鼓问题,通过对110508回风巷底板应力进行理论分析,研究得出,上覆遗留煤柱集中应力和上侧回采工作面采动集中应力共同作用于巷道底板,超出了巷道底板抗变形能力,导致底鼓。基于上述底鼓机理,提出两帮采用?21.98 mm×4 500 mm预应力锚索,加强两帮强度,提高两帮对顶板的抗压强度,并约束底板变形;底板采用注浆锚杆加固,提高底板的抗压强度和抗剪强度。现场监测表明,实施新方案后巷道底鼓量仅为120 mm,围岩变形控制在合理范围内,巷道满足安全生产需要。
The 110508 return airway of Renjiazhuang Coal Mine is situated beneath the goaf of the 110308 working face and directly above the actively mined 110506 working face.It has been subjected to concentrat-ed stress from the overlying remnant coal pillar and mining-induced stress from the upper working face,re-sulting in a maximum floor heave of 1,200 mm in the 110508 return airway.To address this issue,a theoret-ical analysis of the floor stress in the 110508 return airway was performed,and the findings indicated that the combined forces from the overlying remnant coal pillar and the mining-induced stress from the upper working face exceeded the floor's resistance to deformation,causing the heave.In response to this mecha-nism,it was proposed to install pre-stressed cable bolts(ϕ21.98 mm×4,500 mm)on both sides of the airway to enhance the strength of both working faces,improve their vertical bearing capacity for supporting the roof,and increase their constraint on the floor deformation.Additionally,grouted bolts were used to reinforce the floor,thereby enhancing its vertical and lateral bearing capacity.Field monitoring demonstrated that after im-plementing this new scheme,the roadway floor heave was reduced to just 120 mm,the surrounding rock de-formation was maintained within an acceptable limit,and the roadway met the requirements for safe produc-tion.
作者
高雁
赵振飞
GAO Yan;ZHAO Zhenfei(Renjiazhuang Coal Mine of CHN Energy Ningxia Coal Industry Co.,Ltd.,Lingwu,Ningxia,751405)
出处
《能源科技》
2025年第3期31-35,共5页
Energy Science and Technology
关键词
近距离煤层
采动影响
煤柱
注浆
Close-distance coal seam
mining-induced impact
coal pillar
grouting
