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目前我国许多煤矿面临水体下开采和含承压水岩层上开采的问题。前者如江河、湖泊及含水层下的采煤,要防止上部水体溃入井下;后者如华北地区奥陶系灰岩上的采煤,由于奥灰岩溶发育,煤层底板承受较大的水压,要防止底板突水,确保安全生产。防治顶板溃水和底板突水的关键问题是查明不同地质开采条件下采后上覆岩层和下伏岩层的破坏状况,也就是采动破坏裂隙的高度及深度,以便确定合理的开采方案或通过改革采煤方法控制它的发展,使
At present, many coal mines in China are faced with the problems of mining under water and mining on confined water strata. The former, such as rivers, lakes and aquifers under coal mining, to prevent the collapse of the upper water downhole; the latter, such as Ordovician limestone in North China coal mining, due to development of the limestone karst, coal seam floor to withstand greater pressure, To prevent the floor water, ensure safe production. The key problem in preventing and controlling roof water burst and water inrush from the floor is to find out the damage status of the overlying and underlying rock strata after mining under different geological conditions, that is to say, the height and depth of the fractured rock can be destroyed by mining to determine a reasonable mining plan or Control the development of mining by reforming it so that