loose bed
英 美
松散层
... longulite 长朕皱晶 loose bed 松散层 loose rock 疏松岩石 ...
To settle loose bed, 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。
The reducing in water production of tube well is a familiar problem, especially in the loose bed 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。
Moreover, there are some other influencing factors such as: thick loose bed, surface mining degree, impel speed of working face, coal mining and roof manage methods, mining procedure and time.
此外,厚松散层、地表采动程度、工作面推进速度、采煤方法与顶板管理方法、开采程序及时间因素等对采场覆岩空间结构均有一定影响。