期刊
ENGINEERING GEOLOGY
卷 293, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.enggeo.2021.106335
关键词
Sandstone; Cyclic wetting and drying; Uniaxial compression test; Direct shear test; Micro-structure evolution
资金
- National Natural Science Foundation of China [41702327, 41867033, 51609178]
- China Postdoctoral Science Foundation [2019M650144, 2018T110800]
- Natural Science Foundation of Hubei Province [2018CFB593]
- State Key Laboratory of Safety and Health of Metal Mines [zdsys2019-005]
- Open-end Research Fund of the State Key Laboratory for GeoMechanics and Deep Underground Engineering [SKLGDUEK1709]
The cyclic wetting-drying weathering has a significant impact on the mechanical properties of medium-grained sandstone, leading to an increase in water absorption and a decrease in strength and deformation properties as the number of cycles increases. The integrity of the rock specimens weakens progressively with more wetting-drying cycles, resulting in more fragments upon failure. The deterioration in rock strength and deformation properties is primarily attributed to the micro-cracks generated in response to cyclic wetting-drying weathering, which provide valuable insights for the long-term stability evaluation of engineering structures.
As a typical form of weathering, cyclic wetting-drying treatment on host rock is commonly encountered in many applications of geotechnical engineering. How cyclic wetting-drying weathering affects the strength and deformation behavior of host rock is a topic worthy of comprehensively investigating. In this study, the influence of cyclic wetting-drying weathering on mechanical behavior of a medium-grained sandstone is experimentally investigated. The sandstone specimens are first subjected to different wetting-drying weathering cycles, and uniaxial compression tests and direct shear tests are then conducted on these prepared specimens. The results show that the water absorption of the rock monotonically increases with the increase of the number of wetting-drying cycle in the treatment. The strength and deformation properties (i.e., uniaxial compressive strength, Young's modulus, cohesion, and friction angle) are found to decrease with the increase of wetting-drying cycle in the treatment and the decrease gradually diminishes as the number of wetting-drying cycle becomes large. Upon failure of the rock specimen under both uniaxial compression and direct shear, the integrity is progressively weakened and more fragments can be observed as the number of wetting-drying cycle in the treatment gradually increases. The deterioration of rock strength and deformation properties is found to be mainly associated with the micro-cracks generated inside the rock in response to cyclic wetting-drying weathering. The data in this study provide useful guidance for long-term stability evaluation of engineering structures constructed under cyclic wetting-drying weathering condition.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据