The results show that the great plastic yield areas and pull failure areas are formed in the base structure with caved area extends.
结果表明，随矿岩崩落开采，崩落区下方岩层出现较大范围的塑性破坏区和拉破坏区。
Pipe sticking phenomenon appears sometimes during pull-back stage of pipeline crossing with horizontally directional drilling, which results in crossing failure and great economic loss.
在水平定向钻穿越管道回拖环节中，容易出现卡管现象，导致穿越失败，造成巨大的经济损失。
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