论文部分内容阅读
逾渗是一种分形模型,利用声发射点定位盐岩内部破坏网格来建立逾渗模型,可以分析三轴压缩条件下盐岩逾渗特征以及损伤演变发展。研究发现,各试样逾渗模型团簇(cluster)数与最大团簇占有率关系曲线斜率在70%应力峰值后基本相等,利用最大团簇沿试样轴向的延伸来描述裂缝的扩展规律,并通过最大团簇在轴向的延伸终点得到了各试样逾渗的临界破坏比率,它对于研究渗透陡增点非常重要。提出利用逾渗关联长度(关联长度?代表处于同一团簇中的两个点的平均距离)确定试样损伤起始点,并通过计算逾渗模型破坏比率得到损伤变量,它和基于AE振铃计数以及AE能量计算得到的损伤变量结果相近。研究结果表明,逾渗可以形象地表述岩石内部破裂过程和损伤情况,为研究岩石破坏失效及裂缝衍生发展提供了新的思路。
Percolation is a fractal model, and the percolation model is established by using acoustic emission points to locate the percolation model in the salt rock. The percolation characteristics of salt rock and the development of damage evolution under triaxial compression can be analyzed. It is found that the slope of the curve of the number of percolation model clusters and the maximum cluster occupancy ratio of each sample is basically equal after the stress peak of 70%, and the extension of the maximum cluster along the axial direction of the sample is used to describe the crack propagation law The critical failure rate of percolation of each sample was obtained by extending the maximum cluster in the axial direction. It is very important for the study of the sharp increase of penetration. It is proposed to determine the starting point of damage by using the percolation correlation length (the correlation length? Represents the average distance between two points in the same cluster) and obtain the damage variable by calculating the percolation damage rate, As well as the damage variables calculated by AE energy are similar. The results show that percolation can vividly describe the internal rupture process and damage of the rock, providing a new idea for the study of rock failure and crack growth.