含不同预制裂隙相似试样的注浆诱发劈裂裂隙扩展规律研究
Research on extension law of grouting induced splitting fractures in materials similar to coal rocks containing different prefabricated fractures
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摘要: 为了研究煤岩中不同位置、角度和尺寸的裂隙对注浆诱导裂隙劈裂的影响,采用物理相似模拟试验的方法,在煤岩相似试样中设置不同的预制裂隙进行注浆试验,并基于相似试样断面情况、声发射监测结果和泵压曲线,对含预制裂隙相似试样的裂隙劈裂扩展规律进行研究。研究表明:预制裂隙与注浆孔不相交时,含预制裂隙的煤岩相似试样注浆劈裂裂隙的发育过程包含劈裂贯通、浆液填充、裂隙劈裂、劈裂扩展4个阶段;随着预制裂隙尺寸的增大,劈裂裂隙越易向着预制裂隙的方向发育;与预制裂隙贯通后,新发育的劈裂裂隙更倾向沿着预制裂隙的角度向外扩展;相交时,无劈裂贯通阶段;预制裂隙位置、角度和尺寸影响甚至决定着劈裂裂隙的发育方向。Abstract: In order to study the influence of different positions, angles and sizes of cracks in the coal and rock on the grouting-induced cracking, the physical similarity simulation test method is adopted, and different prefabricated cracks are set in similar samples of the coal and rock for grouting test. Similar sample cross section, acoustic emission monitoring result and pump pressure curve, the crack propagation law of similar sample with prefabricated cracks is studied. The research shows that: when the prefabricated cracks do not intersect with the grouting hole, the development process of grouting fracturing fissures for similar samples of coal and rock with prefabricated fissures includes four stages: splitting through, grout filling, fissure splitting, and splitting expansion; as the size of the prefabricated fissure increases, the split fissures are more likely to develop in the direction of the prefabricated fissure; after being penetrated with the prefabricated fissure, the newly developed split fissures tend to expand outward along the angle of the prefabricated fissure; when they intersect, there is no splitting. The rupture stage, angle and size of the prefabricated fissures even determine the development direction of the split fissures.
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Keywords:
- prefabricated fractures /
- splitting law /
- grouting /
- similar material /
- acoustic emission
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