深部开采大断面硐室底鼓控制技术研究

Study on Floor Heave Control Technology of Large-section Chamber in Deep Mining

深部开采时地质构造、地应力等对巷道围岩控制影响更趋明显,特别是大断面硐室掘进时围岩变形控制更趋困难。为了给矿井深部开采创造良好条件,以6采区变电所围岩控制为研究对象,针对底鼓变形量过大导致变电所无法正常使用问题,在对底鼓原因进行分析基础上提出采用预注浆+锚索加固方式控制围岩变形,并进行现场应用。结果表明:通过注浆以及施工锚索后,采区变电所底板泥岩承载能力及稳定性得以显著提升,底鼓防治措施实施完成30d后底鼓变形量基本稳定,最大底鼓量控制在17mm以内,取得较高的底鼓防治效果。

The influence of geological structure and in-situ stress on the control of surrounding rock of roadway tends to be obvious during deep mining,especially when driving in large-section chamber,the control of surrounding rock deformation becomes more and more difficult.In order to create favorable conditions for deep mining,this paper takes the surrounding rock control of substation in No.6 mining area as the research object.Aiming at the problem that the substation can’t be used normally due to excessive deformation of floor heave,based on the analysis of the causes of floor heave,this paper proposes the method of pre-grouting and anchor cable reinforcement to control the surrounding rock deformation,which is applied in the field.The results show that the bearing capacity and stability of mudstone on the floor of substation in mining area are significantly improved after grouting and construction of anchor cables.The deformation of floor heave is basically stable after 30 days’ implementation of floor heave prevention measures,and the maximum floor heave is controlled within 17mm,thus achieving high floor heave prevention effect.