By field observation and simulating test of shallow seam longwall mining, the phenomenon of main roof asymmetry breaking is discovered during the first weighting.
依据典型浅埋煤层工作面的实测和模拟，发现了采场老顶初次破断的非对称现象。
Disaster of water inrush and sand inrush in shallow seam mining area in Western China has become one of the key questions that impact the safe and regular production.
西部浅埋煤层采场的涌水溃沙灾害成为影响安全生产和正常生产的关键问题之一。
Theoretical Analysed the roof without voussoir beam structure in shallow seam mining under thick unconsolidated layers, thus, cann't use voussoir beam theory to compute the force of supports.
同时，理论分析了地表厚松散层浅埋煤层顶板不存在砌体梁结构，因而不能应用砌体梁理论计算支架载荷。
The reasonable definitional feature of shallow coal seam is analyzed base on the overlying strata's composition, the activity law long-wall mining'soverlying layers and the depth of coal seam.
以煤层上覆岩层组成、长壁回采工作面覆岩活动规律、煤层埋藏深度作为浅埋煤层开采界定指标，论证了指标合理取值。
Based on the key strata theory of the ground control and analyzing the condition of geology and mine in the shallow coal seam, the characteristic parameters of the key strata are educed.
基于岩层控制关键层理论，在分析浅埋煤层地质采矿等条件下，得出了浅埋煤层关键层的特征参数。
It is used when mineral deposits are under a shallow, easily removed overburden, and when the vain of ore or seam of coal runs more or less horizontal to the surface.
它适用于矿床埋藏较浅，覆盖层容易剥离，矿脉(煤层)走向与地表大致平行的矿床。
It is used when mineral deposits are under a shallow, easily removed overburden, and when the vain of ore or seam of coal runs more or less horizontal to the surface.
它适用于矿床埋藏较浅，覆盖层容易剥离，矿脉(煤层)走向与地表大致平行的矿床。
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