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• CN 62-1072/P
• ISSN 1000-0240
• 创刊于1979年
• 主管单位：中国科学院
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•                  环境与工程研究所
•                  中国地理学会

• 冰冻圈变化 •

冻融循环对不同孔隙率页岩相似材料影响的试验研究

1. 1.  青岛科技大学
• 收稿日期:2017-08-05 修回日期:2017-08-29 出版日期:2018-03-09
• 通讯作者: 柳雪庆
• 基金资助:

Experimental study on the effects of freeze-thaw cycles on similar materials with different porosity

1.
• Received:2017-08-05 Revised:2017-08-29 Online:2018-03-09
• Supported by:

Abstract: Based on the similarity theory of model test in geomechanics, water, gypsum, cement, river sand were mixed in a certain proportion to make similar model. The porosity of the similar model changed with the particle size of the river sand. Five similar shale materials with different porosities were produced and the porosity of similar shale materials was measured by saturation method. The five kinds of similar shale materials were subjected to freeze-thaw cycles. The uniaxial compression tests and triaxial compression tests were performed on the similar shale materials without freeze-thaw cycles and with freeze-thaw cycles. The experimental research shows that after freeze-thaw cycles, the uniaxial compressive strength, triaxial compressive strength, modulus of elasticity, cohesion and internal friction angle of the similar shale materials have reduced; the porosity and Poisson's ratio have increased to some extent compared with those before freeze-thaw cycles. With the increase of porosity, the influence of freeze-thaw cycles on shale similar materials increases first and then decreases. When the porosity is 9.4%~13.6%, the similar shale materials are most affected by freeze-thaw cycles. When the porosity is 5.8%~9.4%, the influence of the freeze-thaw cycles on shale similar materials increases with porosity. When the porosity is 13.9%~19.1%, the influence of freeze-thaw cycles on shale similar materials decreases with the increase of porosity. The research results can provide scientific basis for the construction of geotechnical engineering and disaster reduction in western cold regions

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