基于分形维数的巷道围岩裂隙演化规律研究

为探究泥质巷道受水平应力及动力扰动影响下的围岩裂隙演化规律，以盘州市山脚树矿226轨道石门为工程背景，综合运用现场调研、数值模拟、分形理论分析等研究方法，对动力扰动下泥质巷道的变形破坏特征、围岩裂隙演化规律、围岩裂隙分形演化特征等问题展开研究。结果表明:动力扰动前，巷道裂隙区和塑性区扩展范围随侧压系数的增加而逐步增大，巷道发生较大变形；受扰动后，随侧压系数的增加，围岩裂隙密度逐步增大，浅部裂隙扩展贯通并逐步延展至深部，巷道裂隙区和塑性区呈现全面不规则扩展。在扰动影响下，巷道围岩裂隙的分形维数较扰动前表现出明显的升维现象，随着侧压系数的增加，裂隙网络更为复杂，浅部裂隙进一步向深部蔓延，使岩体破裂程度更大，导致巷道发生严重变形破坏。 

Research on the evolution law of roadway surrounding rock fissure based on fractal dimension

To explore the evolution law of surrounding rock fissures under the influence of horizontal stress and dynamic disturbance in argillaceous roadways, the deformation and failure characteristics of argillaceous roadways, the evolution law of surrounding rock fissures and the fractal evolution characteristics of surrounding rock fissures under dynamic disturbance are studied by such methods as field investigation, numerical simulation and fractal theory analysis, with the 226 track gate of Shanjiaoshu Mine in Panzhou City as the engineering background. The results show that before dynamic disturbance, the expansion range of fracture zone and plastic zone of roadways gradually increases with the increase of lateral pressure coefficient, and the roadway has large deformation. After the disturbance, the fracture density of surrounding rock increases gradually with the increase of lateral pressure coefficient, and the shallow fractures extend through and gradually extend to the deep. The fracture zone and plastic zone of roadways show comprehensive irregular expansion. Under the influence of disturbance, the fractal dimension of surrounding rock fractures of roadway shows obvious increasing dimension phenomenon compared with that before disturbance. With the increase of lateral pressure coefficient, the fracture network becomes more complex, and the shallow fractures further spread to the deeper part, which makes the rock mass fracture more serious and leads to severe deformation and failure of roadway.