A strong mining disturbance may cause the superposition of local stresses and serious disasters such as crushed supports and severely destroyed roadways. To study the distribution law of mining‐induced stress under hard roof conditions, an advance abutment pressure distribution model was developed. By monitoring the support pressure, a novel method of reckoning intensive factors was proposed, and then, the pressure distribution characteristics were obtained. An innovative in situ test of the mining‐induced stress increment was performed. At the Tongxin coal mine, the field monitoring of no. 8309 working face revealed the following. (a) The peak position of the fully mechanized working face with a hard roof was 5.9 m away from the mining face in which the average intensive factor K was 1.48. The pressure of the single props developed could be roughly divided into the fluctuation, slow increase, and stable stages. (b) A theoretical model of the stress evolution of the working face was proposed. Using an in situ uniaxial compression test, a law governing the variation of the advance abutment pressure was developed. The peak strength was reported to be 36 MPa, which is consistent with the advance prop pressure. (c) Mining‐induced stress violently fluctuated during the process of top coal caving; the K values in the supports in the middle of the working face and their rates of growth were apparently higher than those in the end supports. A Gaussian distribution of K was established for this phenomenon. The results obtained provide first‐hand data for safe and efficient mining under similar geological conditions.

中文翻译：

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坚硬顶板条件下超厚煤层开采诱发应力演化的案例研究

强烈的采矿干扰可能会导致局部应力叠加，并造成严重的灾害，例如支架破碎和道路严重毁坏。为了研究坚硬顶板条件下采矿引起的应力的分布规律，建立了一种先进的桥台压力分布模型。通过监测支撑压力，提出了一种计算强度因子的新方法，进而获得了压力分布特征。对采矿引起的应力增量进行了创新的原位测试。在同心煤矿，没有现场监控。8309工作面显示以下内容。（a）带有坚硬顶板的综采工作面的峰值位置距离平均强度系数K的采煤面5.9 m。是1.48。所开发的单个道具的压力大致可分为波动，缓慢增加和稳定阶段。（b）提出了工作面应力演化的理论模型。使用原位单轴压缩试验，制定了控制前进基台压力变化的规律。据报道，峰值强度为36 MPa，与推进支撑压力一致。（c）放顶煤过程中采矿引起的应力剧烈波动；在工作面中部的支架中的K值及其增长率显然高于最终支架中的K值。K的高斯分布为此现象建立了。获得的结果为在类似地质条件下安全有效开采提供了第一手数据。