基于逾渗模型的盐岩损伤与破坏研究

发布时间：2018-03-27 10:49

本文选题：盐岩　切入点：逾渗　出处：《岩土力学》2014年02期

【摘要】：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。
[Abstract]:Percolation is a fractal model. The percolation characteristics and damage evolution of salt rock under triaxial compression can be analyzed by using acoustic emission point to locate the internal damage grid of salt rock. The relationship between the percolation model cluster number and the maximum cluster occupancy ratio curve slope is almost equal after the peak stress of 70%. The crack propagation law is described by the extension of the maximum cluster along the axial direction of the specimen. The critical failure ratio of percolation of each specimen is obtained through the axial extension end point of the largest cluster, which is very important for the study of the percolation precipitous point. It is proposed to use percolation correlation length (correlation length). Representing the average distance between two points in the same cluster, the damage initiation point is determined, and the damage variable is obtained by calculating the damage ratio of percolation model. It is similar to the damage variable calculated from AE ringing count and AE energy. The results show that percolation can vividly describe the fracture process and damage situation in rock. It provides a new idea for the study of rock failure and crack derived development.
【作者单位】：四川大学能源工程安全与灾害力学教育部重点实验室;四川大学建筑与环境学院;四川大学水利水电学院;
【基金】：国家自然科学基金委国际(地区)合作交流项目(No.51120145001);国家自然科学基金委青年基金项目(No.51104102)
【分类号】：TU45

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