因为辊压机操作规程规定：设备启动时液压系统应处于卸压状态。
Because the rolling machine working instruction has stipulated: when the equipment starts the hydraulic system should be at the release of pressure condition.
并进行了实验室的模拟试验，得出了煤巷卸压槽开挖后煤体周围应力分布状态。
The analogue experiment hasbeen made in laboratory. The state of stress distribution around coal body can be obtained when stress relaxationgroove of coal tunnel has been developed.
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