深部高应力双巷掘进巷道围岩稳定性及控制  

Stability and control of surrounding rock in double lane tunneling with deep high stress

作　　者：张守宝[1] 皇甫龙 王超[1] 李晓斌 李强[1] ZHANG Shoubao;HUANGFU Long;WANG Chao;LI Xiaobin;LI Qiang(School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083

出　　处：《中国矿业》2022年第2期104-112,共9页China Mining Magazine

基　　金：国家自然科学基金面上项目资助(编号:52074269);中央高校基本科研业务费研究生科研创新能力提升项目资助(编号:2020YJSNY16)。

摘　　要：内蒙古自治区葫芦素煤矿13号煤层埋藏较深,煤层处于高应力环境中,区段准备巷道采用双巷掘进的方式。针对辅助运输巷道围岩变形严重以及难以二次利用的问题,通过对巷间煤柱分别在不同阶段建立力学模型以及结合葫芦素煤矿的地质条件,对巷间煤柱留设宽度进行理论分析,最终确定该宽度应不小于35.57 m。结合获取到的覆岩物理力学参数,采用FLAC^(3D)软件进行数值模拟及分析,得到了辅助运输巷在掘进阶段与上区段采场回采阶段影响下的围岩帮部和围岩内部的应力变化关系和位移变化关系,得出葫芦素煤矿在双巷掘进过程中,巷道变形量以两帮移近量为主,巷道两帮出现微小的非对称破坏。在竖直方向上:巷道底板中的应力σ_(y)<巷道顶板中的应力σ_(y)<巷道右帮侧的应力σ_(y)<煤柱中的应力σ_(y)。在水平方向上:煤柱中的最大水平压应力σ_(x)<巷道右侧煤体中的最大水平压应力σ_(x)。提出了深部高应力巷道断面形状为直墙半圆拱,采用顶板配合弧形钢带+高预紧力锚杆(索、网)+反底拱充填配合混凝土的联合支护方式。现场监测表明,顶板最大下沉量为90.0 mm,最大底鼓量为55.0 mm,两帮最大内移量为138.0 mm,表明采用该支护方式后的巷道围岩得到明显改善,能够有效控制巷道围岩变形,保护巷道的整体结构,更好地发挥围岩的自承载能力。The No.13 coal seam of Hulusu coal mine in Inner Mongolia Autonomous Region is deeply buried and the coal seam is in a high-stress environment.The section preparation roadway adopts the method of double lane tunneling.In view of the serious deformation of the surrounding rock of the auxiliary transportation roadway and the difficulty of secondary utilization,through the establishment of mechanical models of coal pillars in different stages and combining with the geological conditions of Hulusu coal mine,the width of coal pillars between roadways is analyzed and it is finally determined that the width should not be less than 35.57 m.Combined with the acquired physical and mechanical parameters of the overlying rock,FLAC^(3D) software is used for numerical simulation and analysis,and the stress change relationship and the displacement change relationship of the surrounding rock side and the surrounding rock interior of the auxiliary transportation entry under the influence of the excavation stage is obtained,it is concluded that in the process of double-lane excavation in Hulusu coal mine,the deformation of roadway is mainly the displacement of two sides,and the two sides of the roadway have slight asymmetric damage.In the vertical direction:the stress in the roadway floorσ_(y)<the stress in the roadway roofσ_(y)<the stress on the right side of the roadwayσ_(y)<the stress in the coal pillarσ_(y).In the horizontal direction:the maximum horizontal compressive stress in the coal pillarσ_(x)<the maximum horizontal compressive stressσ_(x) in the coal body on the right side of the roadway.It is proposed that the section shape of deep high-stress roadway is straight wall semicircle arch.Adopt the combined support method of the roof support with curved steel belt+high pretension anchor rods and anchor cables with anchor nets+the inverse bottom arch filling and matching concrete.The field monitoring shows that the maximum roof subsidence is 90.0 mm,the maximum floor heave is 55.0 mm,and the maximum internal displaceme

关 键 词：深部高应力 双巷掘进 辅助运输巷 应力变化 位移变化 支承压力 围岩变形 

分 类 号：TD353[矿业工程—矿井建设] TD322