Effect of Wet-Dry Cycles on Disinitegration Characteristics of Clay-bearing Sandstone with UF Cracks
腾讯会议 ID：223 952 496
主 讲 人
UF cracks in rock masses commonly occur due to the unloading effect, which constantly happens after the variation of in-situ stress field or rock excavation. The rock samples with UF cracks are obtained by conducting triaxial unloading confining pressure experiment. The effect of wet-dry cycles on the UF cracks, morphology properties and microstructural features of the UF surface was investigated. The characteristics of particle-size uniformity from the sieve test were obtained by the calculation of RMS of particle contents.
The test results show that UF cracks widen significantly and the disintegrated mass increases rapidly in the first three wet-dry cycles, while the fractal dimension of UF surface decreases sharply, but afterwards the disintegrated mass changes gently and the UF surface tends to be flat and smooth. Then, the RMS calculation of particle contents quantitatively evaluate the clay-bearing sandstone’s disintegration properties, which indicate the particle uniformity plays a key role on its disintegration mechanism. Finally, we found that the microstructure of samples from FD group is looser and porous than those from SD group by SEM test. This investigation, considering the similar clay mineral content of all tested samples, demonstrates the closed link between the grain size distribution, microstructural features and the degree of disintegration.
版权所有：Copyright 2014 中国足球竞彩计算器土木与建筑学校 学校地址：宜昌市大学路8号 邮 编：443002 联系电话：0717-6392634（院办）传 真：0717-6392634