围岩松动圈支护理论在煤巷支护设计中的应用

根据围岩松动圈支护理论,在屯兰矿12501运输巷道内应用PHD-2型松动圈测试仪进行围岩松动圈范围测试,确定松动圈厚度值LP并进行松动圈分类。由测试结果可知,巷道围岩松动圈厚度在1.3~1.5m之间,属于中松动圈Ⅲ类一般围岩,应按照悬吊理论设计支护参数,从而确定适用于巷道地质条件的支护方案。通过对支护方案进行现场试验并监测巷道表面位移量,证明巷道变形量小,顶底板最大移近量小于26mm,两帮最大移近量小于36mm,围岩保持稳定。这表明根据围岩松动圈理论设计巷道支护方式及参数是合理可靠的,为屯兰矿巷道支护设计提供了技术参考。

Application of Surrounding Rock Loose Circle Theory in Roadway Support Designing

Abstract: According to the support theory of surrounding rock loose circle, the extent of surrounding rock loose circle was measured with PHD-2 loose circle tester in the 12501 transportation roadway of Tunlan Mine, the thickness and type of loose circle was determined. In accordance with test results, the thickness of loose circle was between 1.3m~1.5m, which belonged to the middle loose circle and common surrounding rock. The support parameters should be devised according to suspension theory so that the support scheme applied to roadway geology condition could be determined. With field test and monitoring of surface displacement, it was seen that the roadway transformation was small, the maximum closer amount of roof-floor was less than 26mm, and that of the sides was less than 36mm, the surrounding rock remained stable. The analysis results showed that to design roadway support with loose circle theory was reasonable and reliable, which provided the technical reference for the roadway support design of Tunlan Mine.