确保采场上覆岩层稳定是矿井安全生产的关键。
It is a key for mine safe production to ensure the stability of overlying rock strata in stope.
永久洞室的支护方法，多年来一直是松软岩层矿井生产的技术难关。
The supporting of permanent openings has been a difficult problem in production and technique for many years.
在工作面特定的生产技术和地质条件下，掌握工作面上覆岩层的运动规律，对合理控制顶板非常重要。
It is important to master movement rules of overburden rock layers to control roof rationally in special production and geological conditions.
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