高强度开采工作面矿压显现复杂，容易发生压架、冒顶等灾害。为从理论上解释高强度开采工作面的矿压特征，分析了高强度开采工作面的一般特征及其对矿压显现的影响，以顶板初次断裂为例，运用薄板理论并结合岩石力学试验成果，推导出不同面长和不同推进速度下顶板断裂步距的计算公式，并分析了面长和推进速度对来压时支架工作阻力的影响机制。结果表明，面长影响顶板应力分布，推进速度改变顶板承载能力，而且面长越短，推进速度越快，顶板的初次断裂步距就会越大。对于高强度开采工作面，面长普遍大于200 m，面长效应影响微弱，矿压显现主要受推进速度作用，断裂步距和来压时支架工作阻力都比非高强度开采工作面大，容易发生压架和冒顶等灾害。

The high-intensity mining face has complex strata behaviors and high propensity to support crushing, roof falling and other disasters. To theoretically explain the characteristics of strata behaviors in high-intensity mining, the general characters of high-intensity mining and its influence on strata behaviors are analyzed first. Then taking the roof’s first caving for example, based on the plate structure theory and the rock mechanics testing, a formula of first caving interval under different advancing speeds and with different face lengths is derived; and the impact mechanism of working face length and advancing speed on working resistance of support is also explained. The results show that, working face length affect the stress distribution of roof while advancing speed change bearing capacity of roof; the shorter the working face is and faster the advancing speed is; the greater the roof’s first caving interval is. In most of high-intensity mining, the working face length is more than 200 m. At this point, strata behaviors are mainly affected by advancing speed instead of face length. Thus, the roof’s caving interval and working resistance of support in high-intensity mining face are bigger than the general, and easier to support crushing, roof falling and other disasters.