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    EFFECT OF WET-DRY CYCLES ON DISINTEGRATION CHARACTERISTICS OF CLAY-BEARING SANDSTONE WITH UF CRACKS

    作者: 發布時間:2020年10月27日 21:51 瀏覽:

    報 告 名 稱

    EFFECT OF WET-DRY CYCLES ON DISINTEGRATION CHARACTERISTICS OF CLAY-BEARING   SANDSTONE WITH UF CRACKS

    時 間

    20201029日下午16:00

    地 點

    地學樓二樓學術報告廳

    主 講 人

    王宇副教授

    主辦單位

    三峽大學土木與建筑學院

    報告摘要

    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.

    報告人簡介

    王宇博士,土木與建筑學院副教授,在國家留學基金委資助下于2019.03~2020.05訪問加拿大阿爾伯塔大學。該報告將介紹卸荷破裂巖體在干濕循環作用下的崩解機理研究最新進展。

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