特厚煤层综放工作面回撤通道支护技术研究

Study on support technology of equipment removal channel in fully-mechanized top coal caving face in ultra-thick seam

针对酸刺沟矿特厚煤层综放工作面回撤通道围岩支护与稳定的难题,基于现场实测和数值模拟,分析了回撤通道围岩的变形破坏特征,提出了回撤通道锚网索联合支护技术。结果表明:当工作面距离回撤通道30 m时,围岩塑性破坏范围开始增大,当工作面距离回撤通道10 m时,围岩塑性破坏剧烈,工作面贯通后,回撤通道顶板塑性区深度到达7 m,靠近煤壁侧的顶板破坏深度更深,煤柱帮塑性区深度达到3.5 m。根据回撤通道围岩变形破坏特征,坚持主控"顶板和煤柱帮"的原则,采用锚网索联合支护,并在6上109回撤通道成功应用,实现了工作面设备顺利回撤。

According to the problem of surrounding rock supporting and stability of equipment remove gateway in ultra-thick seam fullymechanized caving faces in Suancigou Mine,the deformation and failure characteristics of the surrounding rock of equipment remove gateway are analyzed by field measurements and numerical simulation,the combined supporting technology of cable anchor in equipment remove gateway is put forward. The result shows that when the distance is 30 m between working face and equipment remove gateway,plastic collapse of surrounding rock begins to increase,when the distance is 10 m between working face and equipment remove gateway,plastic collapse of surrounding rock is severe,after working face is connected with equipment remove gateway,the depth of plastic zone of roof reaches 7 m,roof near the coal wall is deeper,the depth of plastic zone of coal pillar is 3.5 m. According to the deformation and failure characteristics of surrounding rock of equipment removal channel,adhering to the principle of controlling ＂ roof and pillar ＂,the combined supporting technology of cable anchor is used. This technology has been successfully applied in No.6 up-109 equipment remove gateway,the equipment has been successfully withdrawn.