深部顶板夹煤层巷道围岩变形破坏机制及控制

深部矿山顶板夹煤层巷道顶板围岩变形破坏严重，控制难度大。现场探测发现此类巷道围岩具有独特的二分区破裂模式，存在相对独立的巷道周圈松动破裂区和夹煤层界面离层破裂区。建立计算模型，研究了夹煤层厚度、位置和分岔巷道岩柱宽度3个因素对巷道关键点位移、塑性区、非对称变形的影响规律，分析了围岩变形破坏机制：夹煤层界面离层破裂区的发展，造成围岩自承结构的失效和自承能力的丧失，破裂区超过支护体系控制范围，最终导致围岩破坏失稳。提出了“内修+外控”的以注为主的非对称联合控制对策，现场试验显示取得了较好效果。

Deformation and failure mechanism analysis and control of deep roadway with intercalated coal seam in roof

Surrounding rock of deep roadway with intercalated coal seam in roof always generates serious roof deformation and failure，and is difficult to control.Unique 2-partition fracture mode of surrounding rock is found by site detection，that there are two relatively independent serve fractured zones in surrounding rock，which are “roadway peripheral loose fracture zone” and “roof separation fracture zone beside intercalated coal seam interface” respectively.The calculation model was proposed，based on which the laws of roadway key points displacement，plastic zone，and asymmetric deformation influenced by the thickness and location of intercalated coal seam and middle wall width of bifurcation roadway was researched，and the deformation and failure mechanism was analyzed.The results show that the existence and development of “roof separation fracture zone beside intercalated coal seam interface” in the deep roof，leads to the failure of the self-bearing structure and the loss of self-bearing capacity of surrounding rock，fracture zone exceed the range of support system，and finally the overall failure of surrounding rock and support.The “inner repair + outer control” asymmetric controlling measure with mainly grout was proposed based on research results，which was carried out in field test，and achieved good results.