片帮

/ piàn bāng /

1
rib spalling
...片帮；冒顶；伸缩梁；护帮板 [gap=919]Keywords : large mining height fullymechanized hydraulic support；rib spalling；roof falling；extensible canopy；face guard ..
2
coal slide
... 胶带输送机 belt conveyor 片帮 coal slide 冒顶 roof fall ...
3
rib fall
片帮

短语

1
片帮事故
side falling accident
2
冒顶片帮
roof fall rib spalling ; Roof Fall and Rib Spalling ; roof fall and wall collapse
3
片帮冒顶
spalling and roof falling

1
从片帮型冲击矿压发生的机理出发，分析了煤层煤巷采用锚杆支护减冲的机理。
Based on the occurring mechanism of slough rock burst, the mechanism to weaken shock with bolt support in coal roadway is analyzed.
2
地下工程中临空面上首先冒落并引发其他岩块冒落或片帮的块体称作“危石”。
The block which will be the first of caving rocks from free surface and lead to more caving or side-fall in underground work is known as "critical rock".
3
武山铜矿南矿带采用上向水平分层进路水砂充填法回采，采场多次发生冒顶、片帮。
The South ore-bearing zone of Wushan copper mine is mined with ascending horizontal slicing hydraulic fill crosscut mining system. Roof falling and rib spalling occurred in any times.

片帮
矿层采出后，采空区顶板岩层内出现悬空，其压力便转移到煤壁上，煤壁承受的压力增加，形成增压区，煤壁在附加荷载的作用下，一部分煤被压碎，并挤向采空区，这种现象称为片帮。工作面前方的支承压力是煤壁片帮产生的主要原因，不同的煤层条件，包括硬度、节理裂隙发育程度、地质构造发育情况，使不同工作面煤壁片帮形式不同。有的工作面不片帮，有的工作面片帮严重。

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