深部巷道围岩分区破裂化现象现场监测研究

 随着矿产资源的开发，深部巷道围岩中出现了破裂区和完整区相间的分区破裂化现象，这是一种新发现的特殊工程地质现象，引起了国内外岩石力学界的关注，但相关研究还不深入。为在现场监测深部巷道围岩的分区破裂化现象，在淮南矿区近千米深井半径不同的巷道选择了4个监测断面，每个断面布置了3～5个钻孔，采用矿井钻孔电视成像仪对巷道断面围岩不同钻孔内的破裂情况进行了监测，监测到了围岩内的分区破裂化现象，并给出了4个断面围岩的分区破裂分布图。通过分析巷道所在岩层、地质资料及钻孔内裂隙的形状，说明裂隙是由巷道开挖引起的。监测结果表明，3个大断面巷道围岩内的相同破裂分区的半径和厚度相差不大，小断面巷道围岩内的破裂分区与大断面相似，只是相同各破裂分区的半径和厚度相应减小，表明各破裂分区的半径是巷道半径r的关系式为 (i = 1，2，3，4)。4个监测断面围岩内均产生了4个破裂分区，第1个破裂分区厚度与巷道半径相当，破裂程度最严重，第2个破裂分区其后各破裂分区厚度和破裂程度均依次减小。研究结果对于认识深部巷道围岩的破裂模式及其稳定性支护具有重要意义。

IN-SITU MONITORING RESEARCH ON ZONAL DISINTEGRATION OF SURROUNDING ROCK MASS IN DEEP MINE ROADWAYS

With the mine resources development，an alternation of fracturing area and intact area phenomenon so-called zonal disintegration appears in surrounding rock mass of deep mine roadways. This is a newly- discovered special engineering geological phenomenon and it attracts scholars¢ attentions in rock mechanics fields，but related research is not clear. In order to observe zonal disintegration phenomenon，four sections in roadways with different dimensions under about 1 000 m deep mine are considered；three or five bores being arranged in each section. The fracturing through bores of surrounding rock mass is observed by mine bore TV imager；zonal disintegration phenomenon is observed in surrounding rock mass and zonal disintegration distributions in four sections are obtained. Analyses of roadway location，geological data and fracturing shape in bore show that fracturing is caused by excavation. Observation results also show that the radius and thickness of three large sections¢ fracturing areas are almost the same. Small sections¢ fracturing areas are similar with those of large sections，but radius and thickness of fracturing areas reduce correspondingly. Analyses display that the relation between each fracturing area radius and roadway radius r is nearly expressed by (i = 1，2，3，4). There are four fracturing areas in surrounding rock of four observation sections. The thickness of first fracturing area is similar to roadway radius，and the first fracturing area is the most seriously fractured；and the other fracturing areas thickness and fracturing extension reduce consequently. The research results are important for surrounding rock fracturing mode of deep mine roadway and the corresponding stability reinforcement.