Bimrocks have been rarely studied due to their inhomogeneous properties, challenges related to specimen preparation and tedious in-situ tests. This study was undertaken in an attempt to determine the shear strength parameters as well as the deformation behavior of a highly welded bimrock using laboratory meso-scale direct shear tests. In addition digital image processing analyses (DIP) and fragmentation fractal dimension (DF) calculations were made to quantify the geometrical and structural properties of the bimrock. It was concluded that the block size distribution of Sille bimrock is scale-invariant and shows fractal fragmentation. Moreover the block sizes have power-law distributions and there is evident skewness in normal distribution. The test results demonstrated that with the increase of volumetric block proportions (VBP), the internal friction angle (ϕ) of the bimrock increases whereas its cohesion (c) decreases. Strain softening behavior was observed after attaining the peak shear stress for all normal stresses and the VBP values. It is revealed that the normal stress is more effective than the VBP on the development of dilatation/contraction behavior. Lastly, the negative correlation between the DF and the peak shear stress indicated that the shear strength of the bimrock increases while the proportion of relatively small blocks in the specimen decreases.

由于其不均匀的特性、与样品制备相关的挑战和繁琐的原位测试，Bimrocks 很少被研究。进行这项研究是为了尝试使用实验室中尺度直接剪切试验来确定高度焊接的bimrock 的剪切强度参数以及变形行为。此外，数字图像处理分析 (DIP) 和碎片分形维数 ( DF)) 进行了计算以量化 bimrock 的几何和结构特性。得出的结论是，Sille bimrock 的块体大小分布是尺度不变的，并表现出分形破碎。此外，块大小具有幂律分布，并且正态分布有明显的偏度。试验结果表明，随着体积块比（VBP）的增加，砖石的内摩擦角（φ）增大，而其内聚力（c）减小。在获得所有法向应力和 VBP 值的峰值剪切应力后，观察到应变软化行为。结果表明，正常应力比 VBP 对扩张/收缩行为的发展更有效。最后，DF之间的负相关 峰值剪应力表明，在试件中相对较小块体的比例降低的同时，土体的抗剪强度增加。