To settle loosebed, quick sand and ingress of groundwater are trouble some problems during coalmine construction.
如何解决煤矿建井中的松散层、流沙和地下渗(涌)水是目前建井工程中的棘手问题。
2
The reducing in water production of tube well is a familiar problem, especially in the loosebed of the quaternary system.
管井出水量减少是常见的问题,特别是第四系松散层中的管井更为普遍。
3
Moreover, there are some other influencing factors such as: thick loosebed, surface mining degree, impel speed of working face, coal mining and roof manage methods, mining procedure and time.