垮塌煤巷内快速构建阻水墙技术

Fast Water-blocking Wall Construction Technology in Collapse Coal Roadway

为解决垮塌巷道中充填骨料堆积半径小,阻水墙初步形成时间长的问题,及其初步形成之后,阻水墙及软弱煤巷,容易受突水点内外压差△p作用而失稳的问题,在充填注浆阶段,首次省去灌入骨料,采用了"水泥单浆液充填注浆技术",及"大井回灌助推阻水墙快速构建技术"。结果表明:水泥单浆液的扩散半径大,阻水墙形成有效连接迅速;大井回灌技术降低了△p增大速率,使其保持在阻水墙及软弱煤巷能够承受的范围内,只用42 d便完成了阻水墙的构建。

The radius of filling aggregate accumulation is small in collapse roadway,the preliminary form time of water-blocking wall is long,at the same time,the water-blocking wall and the weak coal roadway is easily affected by water pressure difference between internal and external water inrush point △p and lose stability after the preliminary form of water-blocking wall. In order to solve the above problems,during filling grouting,the stage of filling aggregate is eliminated firstly,the technologies are used,including the single slurry filling grouting technique by cement and fast water-blocking wall construction technique by large well recirculation. The results show that the diffusion radius of single cement slurry is large and the effective connection of water-blocking wall is quick; the large well recirculation technology has reduced the increasing rate of △p and makes it in the range that the water-blocking wall and weak coal roadway can withstand,it takes 42 days to achieve the construction of water-blocking wall.