boundary of section
采空区边界 [矿业] gob edge
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采区边界煤柱控制走向方向的上覆岩层破坏范围，采空区边界三角煤柱控制倾斜方向的上覆岩层滑移变形，最终达到控制地表沉陷的目的。
With barrier pillars to decrease the strata movement along the strike, and goaf triangle pillars to decrease the strata slipping along the dip, surface subsidence could be preferably controlled.
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