Meso-research on the development of rock surface crack under#br#
freeze-thaw cycles
Chen Yulong1 Zhang Ke2 Sun Huan1
1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;
2. Kunming University of Science and Technology, Kunming 650500, China
Abstract：Development of rock surface crack in the directions of perpendicular and parallel to the stratification under freeze-thaw cycles is studied at meso-scale by laser scanning microscope. A stratification contained numerical model is simulated to study the stress distribution, fracture propagation and the mechanism of edge fracturing due to freeze-thaw cycles. The results show that: crack depth, crack width and surface area ratio increase with freeze-thaw cycles. Some particles crush and spall by freezing and thawing cycles. Crack depth, crack width and surface area ratio increase slightly for parallel stratification condition while significantly for perpendicular stratification. Stratification is regarded as weak plane where cracks may first initiate and propagate. Formation and propagation of crack lead to redistribution of stress field. Stress concentrates in the intersection of stratification and surface. Most of cracks initiate from the surface.
陈宇龙 张 科 孙 欢. 冻融循环作用下岩石表面裂纹扩展过程细观研究[J]. 土木工程学报, 2019, 52(S1): 1-7.
Chen Yulong Zhang Ke Sun Huan. Meso-research on the development of rock surface crack under#br#
freeze-thaw cycles. 土木工程学报, 2019, 52(S1): 1-7.
