高瓦斯综放工作面瓦排巷墩柱支护技术研究

Study on Pier Supporting Technology of Gas Drainage Gateway of Full-mechanized Caving Mining Face

高瓦斯矿井综放工作面采用双"U"型通风方式解除瓦斯的制约,但外圈巷道受动压影响变形大(底鼓量高达2.0 m),严重影响通风和行人的安全,一般采用木垛进行加强支护,效果不好。为此,提出了用高水速凝材料墩柱代替木垛进行加强支护。FLAC3D数值模拟及现场矿压观测结果显示,墩柱支护优于木垛支护,并能有效地控制巷道围岩变形,平均每米巷道节约4 243元,效益明显,为类似地质条件下巷道支护提供一种行之有效的方案。

The fully mechanized coal face of high- methane coal mine adopting double ＂U＂ type ventilation way remove the threat of methane. But the outer roadway affected by the dynamic pressure bringing about severe deformation （the heaving floor reach up to 2.0 m） , seriously affect the ventilation and pedestrians＇safety. The general use of the crib timbering to reinforce supporting is unsatis- fied. Therefore, the reinforcement method of high - water and quick - setting pier instead of crib timbering is put forward. FLAC3D nu- merical simulation and field - observation results of rock pressure showed that the supporting can effectively control the deformation of surrounding rock of roadways and better than crib timbering, and save 4 243 yuan per meter roadway , benefit is obvious . This pro- vides an effective support scheme for roadway support in the similar geological conditions.