大变形软岩顶底板煤巷锚网索联合支护研究

黑沟煤业有限公司煤巷项底板均为松软岩层,为解决巷道在埋藏深度不大条件下变形严重、难以维护问题,对巷道围岩弱结构变形特征和锚固支护机理进行理论分析和Flac3D数值模拟.结果表明:锚杆支护所产生的夹持作用使浅部围岩形成类拱形支护体,提高围岩整体刚度和自身承载能力；底角锚杆促使底板高应力区向深部转移,降低底板应力性底鼓,在控制底鼓变形中起重要作用；锚索可缩小顶底板岩层拉应力区范围及围岩破坏程度,提高顶底板岩层整体稳定性；钢带、金属网形成柔性支护,阻止浅部围岩破坏向深部发展.锚网索联合可实现大变形软岩顶底板煤巷的有效支护.

Bolt-Cable and Wire-Netting Combined Support Research of Large Deformation Coal Entry with Soft Roof and Floor

The coal entry’s roof and floor of Heigou Co.Ltd were soft strata.It was analyzed in theory and numerical simulated by Flac3D software of the surrounding rock weak structure deformation and bolting support mechanism that in order to resolve the serious deformation of the coal entry under shal-low depth.The results show that the clamping action produced by bolting support result in the formation of arched support body of shallow rock which enhance the self-bearing capacity and integral stiffness.It is the floor corner bolts which play an important role in controlling the heave that induce floor peak stress area shift to the deep and reduce the stress-floor heave degree.The anchor cable supports reduce the tensile stress area and strata damage degree and increase the integrated stability of roof-floor seam.The flexible structure formed by steel belt and metal mesh prevent the damage develop to the deep.The combination of bolt and cable and wire-netting can achieve the effective support of the large deformation coal entry with soft roof and floor.