煤层抗拉强度的波速测定研究

Study on tensile strength of coal seam by wave velocity

对煤块波速及其抗拉强度进行了系统地测试和分析,煤岩波速和抗拉强度具有明显的各向异性,两者之间有很好的相关关系,并建立了波速—强度关系式。在井下对煤层波速进行了测试,根据波速测强公式和完整性推算强度公式,确定了煤体的抗拉强度,为煤矿井下防隔水煤柱合理留设提供了重要参数,也为煤层强度的确定提供了一种新的方法。

The wave velocity and tensile of coal samples were systematically been tested and analyzed. The results showed that the wave velocity and tensile strength of coal were obviously anisotropic and had very close relationships. The relation formula of wave velocity-strength were established. The wave velocity of coal seam were tested under mine. According to the test strength in terms of wave velocity and calculated strength based on integrity, the tensile strength of coal mass was determined. It provided not only important parameters for designing reasonable waterproof measures, but also a new method for determining strength of coal seam.