The key stratum is not easy to cave, but once it is caved, there will be a sudden collapse of a rather thick stratum.
关键层较难崩落，但在崩落时具有突发性，会产生较大厚度岩层的突然垮塌。
Under stratum condition of thick soil layer, we can study it as random medium and use probability integral method to estimate surface movement.
在厚松散层地层结构条件下，可将其视为随机介质，采用概率积分法预计地表移动变形。
The vital problems to be solved in Shendong mine are the dynamic pressure damage of thin rock strata roof under thick sandy soil soft stratum and the loss of water and soil under mining.
浅埋煤层薄基岩厚砂土松散层顶板动压灾害和采动水土流失是神东矿区急需解决的重大问题之一。
Research of static correction method and investigation technology about the surface stratum structure of huge thick gravel area of front-zone of mountain.
山前带巨厚砾石区的表层结构调查技术及静校正方法研究。
A controlled blasting technology was applied to the construction of freezing thick gravel stratum section in the main shaft of Xulou Mine.
许楼煤矿在主井人工冻结巨厚砾岩段施工中，采用了控制爆破技术。
Results:There were thick fibrous stratum at external layer and synovialis stratum at internal layer of intervertebral capsula.
观察椎间关节滑膜层及纤维层的结构特点。结果：椎间关节囊外为纤维层，内为较薄的滑膜层。
顶板厚沙土层；
顶板厚沙土层；
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