Hydrogeology Team of Hebei Coalfield Geology Bureau

在现有“三带”理论、“四带”模型的基础上,对覆岩离层注浆充填后的覆岩状态沿工作面走向由下至上划分了破裂垮落重组带、安全隔离带、基岩完整带和松散层冲积层带的覆岩离层注浆充填“四带”。工程实践结果表明,采煤工作面覆岩离层注浆充填后,下沉值满足了“三下”采煤规范中建(构)筑物保护等级Ⅰ级标准,注浆预警区、过渡区未出现突然沉降、不均匀沉降等现象。该分带模型对同类覆岩离层注浆充填工程技术推广应用有一定的指导意义。

On the basis of the existing “ three zones” theory and “ four zones” model, the overlying rock state after separationgrouting and filling in the overlying rock is divided from bottom to top along the working face direction into the “ four zones”of fracturing and caving recombination zone, safety isolation zone, bedrock integrity zone, and loose alluvium zone. The engineering practice results show that after separation layer grouting and filling the overlying rock of the coal mining face, thesubsidence value meets the level I standard for building ( structure) protection level in the “ three down” coal mining specifications, and there is no sudden settlement or uneven settlement in the grouting warning zone and transition zone. This zoning model has certain guiding significance for the promotion and application of separation grouting and filling engineeringtechnology in similar overlying rock.