复杂应力条件下巷道围岩综合控制技术研究

Research on comprehensive control technology of roadway surrounding rock under complex stress conditions

近年来,随着全国尤其是东部地区煤炭开采深度不断增加,巷道在受回采动压等影响下,顶帮出现变形严重,底板鼓起等现象。东庞矿采掘逐步向深部地区转移,煤巷围岩具有应力场复杂、煤体蠕变及煤层表现出典型的松软、破碎等特征,易导致煤巷围岩大变形等情况,针对这一情况,东庞矿在12采区轨道巷研究复杂应力条件下巷道围岩综合控制技术,采取了一排锚杆一排锚索的支护方式,局部采用全锚索支护,喷浆、注浆等方式来提高支护强度。在高强度支护等手段的基础上又提出在煤帮深部区域开挖一个大型孔洞并布置调控系统进行持续大变形控制的新方法,抵御深部巷道围岩大变形。根据观测数据分析可以看出,巷道围岩相对变形量大幅减小,稳定性大大提高,保证巷道围岩的长期稳定,减小巷道变形程度,进而延长巷道使用寿命,减少巷道反复维修带来的巷修费用,为同类型巷道围岩支护提供理论与技术经验。

In recent years,with the increasing depth of coal mining in the whole country,especially in the eastern region,under the influence of mining dynamic pressure,the deformation of the roof was serious,and the floor heaved.The mining field of Dongpang Mine was gradually transferred to the deep area.The surrounding rock of coal roadway had the characteristics of complex stress field,creep of coal body and typical soft and broken coal seam,which can easily leaded to large deformation of surrounding rock of coal roadway.In view of this situation,Dongpang Mine studied the comprehensive control technology of roadway surrounding rock under complex stress conditions in the track roadway of 12 mining area.The support mode of one row of anchor bolts and one row of anchor cables was adopted,and the support strength was improved by means of full anchor cable support,shotcrete and grouting.On the basis of high strength support and other means,a new method of excavating a large hole in the deep area of coal side and arranging control system for continuous large deformation control was put forward.Resist the large deformation of surrounding rock in deep roadway.According to the analysis of the observation data,it was seen that the relative deformation of the surrounding rock of the roadway was greatly reduced,the stability was greatly improved,the long-term stability of the surrounding rock of the roadway was ensured,the deformation degree of the roadway was reduced,the service life of the roadway was prolonged,and the roadway repair cost caused by repeated maintenance of the roadway was reduced,which provided theoretical and technical experience for the support of the surrounding rock of the same type of roadway.