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依据地下厂房围岩各点位移在时域上的变化特征,剖析了围岩各点变形的分形特性,探讨了分形维数的变化规律与趋势。研究发现,仪器各测点的位移时域曲线分形维数的极大值均出现在被裂缝穿越的厂(横)0+115.60断面上,究其原因,是该断面相对其他部位存在更多引发围岩变形的因素,导致所测位移时间曲线的不规则程度增大,使其存在更多精细结构,因而量测出的维数将更大。位移时间曲线维数达到极大值极有可能是仪器埋设处围岩开裂的迹象与先兆,这可作为围岩开裂与否的判据。
According to the variation characteristics of the displacements of the surrounding rock of underground powerhouse in the time domain, the fractal characteristics of the deformation of surrounding rock are analyzed. The changing rules and trends of the fractal dimension are discussed. The study found that the maximum value of the fractal dimension of the displacement time-domain curve at each measuring point of the instrument all appeared on the 0 + 115.60 section of the plant (horizontal) crossed by the crack. The reason is that the cross-section has more initiation than other parts The deformation of the surrounding rock causes the irregularities of the measured displacement time curve to increase, allowing for more fine structure and therefore more dimensions to be measured. It is most likely that the displacement dimension curve reaches the maximum value and is a sign of the cracking of surrounding rock at the place where the instrument is buried. This can be used as a criterion for the cracking of surrounding rock.