防水隔离煤柱结构分区及合理宽度确定

Structural division and determination of rational width for waterproof partition coal pillar

在现有煤柱合理结构分区的基础上,将其结构分为塑性区、弹性核区、水压破坏区。为求得各区宽度,首先,应用极限平衡理论和抛物线型强度理论,采用分离变量法确定了塑性区宽度;考虑矿压、水压作用,选用统一强度理论,采用半逆解法,确定了弹性核区宽度;考虑水的浸润软化作用,确定了水压破坏区宽度。之后,通过与以往经典模型各分区计算公式对比,验证了模型的合理性。最后,通过超声波探测技术,测量了煤柱内部的物理形态分布,验证了模型的正确性,并将研究成果应用于董家河煤矿防水隔离煤柱设计中,为煤矿安全高效生产提供了理论依据。

The waterproof partition coal pillars are divided into the plastic zone, the elastic core zone and the hydraulic fractured zone on the basis of the existing reasonable structural division of coal pillars. The width of the plastic zone is derived with the application of limit equilibrium theory, the parabolic strength theory and the method of separation of variables. The width of the elastic core zone is derived adopting the semi-inverse method with the consideration of mine pressure and hydraulic pressure effects and the selection of unified strength theory. The width of hydraulic fractured zone is determined considering the infiltrating and softening effects of water. The comparisons with the results from previous typical models for each zone confirm the reasonability of the model. The monitored structures of inner coal seam with the ultrasonic probing technique also verify the correctness of the model. The method was applied to the design of the waterproof partition coal pillar in Dongjiahe coal mine for the secure and high-efficient production of the coal mine.