缓倾斜厚煤层综放工作面跨空巷开采技术与实践

Mining Technology and Practices of Fully- Mechanized Top Coal Caving Mining Face in Gently Inclined Thick Seam Passing Through Abandoned Gateway

为了防止红会四矿4701综放工作面跨空巷回采过程中出现空巷冒落、架前冒顶等事故,确保工作面回采过程支护及时到位。通过建立工作面正常推进及工作面渐近空巷时的支架力学模型,研究了支架在正常推进过程和渐近空巷时的受力状态。结果表明:工作面过空巷时支架工作阻力将增大,一般为正常周期来压的1.5~2.0倍;通过采用架设木垛和充填矿渣相结合的超前支护空巷方案,采取板梁垫底、工作面伪斜开采、加快推进速度、控制工作面过空巷段时的放煤量、带压擦顶移架等综合技术措施,能较好地控制空巷段围岩的变形,确保了综放工作面跨空巷的安全回采。

In order to prevent a roof falling in an abandoned gateway,roof falling in a front of the powered support and other accidents oc-curred during a mining process of No.4701 fully-mechanized top coal caving mining face passing through the abandoned gateway in Hong-hui No.4 Mine and to ensure in time support during the mining process of coal mining face,with establishment of powered support mechan-ics model when the coal mining face was in normal pushing forward and the coal mining face was closed to the abandoned gateway,stress status of the powered support was studied when the coal mining face was in normal pushing forward process and was closed to the aban-doned gateway.The study results showed that when the coal mining face was passing through the abandoned gateway,a working resistance of the powered support would be increased and would be 1. 5~ 2. 0 times higher than a normal periodical roof weighting.When an advance a-bandoned gateway support plan combined with wood stacks and mineral waste backfilling applied,deformation of surrounding rock section in the abandoned gateway could be well controlled with slab beams setting on the seam floor,false-inclined mining face,rapid pushing for-ward speed,a controlled top coal caving quantity when the coal mining face passing through the abandoned gateway,powered support for-ward moving with a closed pressure against with the roof and other comprehensive technical measures in order to ensure safety mining of the fully-mechanized top coal caving face passing through the abandoned gateway.