A slope at the Bingchang mining area was taken as an example to investigate the fracturing effect of extra thick coal seam mining on the overlying loess slope. The occurrence and mechanical characteristics of fractures in the loess slope were analyzed by using the physical model test and numerical simulation method. The test results show that fractures caused by coal mining in the overlying loess slope can be divided into two groups: fractures approximately perpendicular to the slope surface and fractures approximately parallel to the slope surface, indicating obvious spatial differentiation and orderly appearance. Fractures approximately perpendicular to the slope surface appear first and have characteristics of tensile cracks; they play an important role in cutting slopes. The fractures approximately parallel to the slope surface are derived gradually from the fractures perpendicular to the slope surface; they have characteristics of shear cracks and control the formation of potential sliding surfaces in the loess slope. In a word, the two groups of fractures cut the slope in a net shape, inducing the soil structure of the slope to break and fragment.
成玉祥,甘玥,陈毛宁.特厚煤层开采引起上覆黄土斜坡裂隙化试验研究[J].地震工程学报,2023,(1):27-33. CHENG Yuxiang, GAN Yue, CHEN Maoning. Model test on fracture development in overlying loess slopes caused by extra thick coal seam mining[J]. China Earthquake Engineering Journal,2023,(1):27-33.复制