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干湿循环作用下砂岩细观损伤演化及宏观劣化研究

傅晏, 王子娟, 刘新荣, 袁文, 缪露莉, 刘俊, 邓志云

傅晏, 王子娟, 刘新荣, 袁文, 缪露莉, 刘俊, 邓志云. 干湿循环作用下砂岩细观损伤演化及宏观劣化研究[J]. 岩土工程学报, 2017, 39(9): 1653-1661. DOI: 10.11779/CJGE201709013
引用本文: 傅晏, 王子娟, 刘新荣, 袁文, 缪露莉, 刘俊, 邓志云. 干湿循环作用下砂岩细观损伤演化及宏观劣化研究[J]. 岩土工程学报, 2017, 39(9): 1653-1661. DOI: 10.11779/CJGE201709013
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FU Yan, WANG Zi-juan, LIU Xin-rong, YUAN Wen, MIAO Lu-li, LIU Jun, DUN Zhi-yun. Meso damage evolution characteristics and macro degradation of sandstone under wetting-drying cycles[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(9): 1653-1661. DOI: 10.11779/CJGE201709013
Citation: FU Yan, WANG Zi-juan, LIU Xin-rong, YUAN Wen, MIAO Lu-li, LIU Jun, DUN Zhi-yun. Meso damage evolution characteristics and macro degradation of sandstone under wetting-drying cycles[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(9): 1653-1661. DOI: 10.11779/CJGE201709013
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干湿循环作用下砂岩细观损伤演化及宏观劣化研究  English Version

  • 1. 重庆大学建设管理与房地产学院,重庆 400045;
    2. 重庆大学建设经济与管理中心,重庆 400045;
    3. 重庆工商大学管理学院,重庆 400067;
    4. 重庆大学土木工程学院,重庆 400045

基金项目: 国家自然科学基金项目（41372356）; 国家自然科学基金青年基金项目（51308567）; 中央高校基本科研业务费专项项目（106112016CDJSK03JD01）
详细信息
    作者简介:

    傅 晏(1981- ),男,博士,主要从事岩土工程、地下空间与工程等领域的教学与科研工作。E-mail: fuyan1981@qq.com。

    通讯作者:

    王子娟，E-mail：346484339@qq.com

  • 中图分类号: TU452

Meso damage evolution characteristics and macro degradation of sandstone under wetting-drying cycles

  • 1. College of Construction Management and Real Estate, Chongqing University, Chongqing 400045, China;
    2. Chongqing University Center For Construction Economics and Management, Chongqing 400045, China;
    3. School of management, Chongqing Technology and Business University, Chongqing 4000673;
    4. College of Civil Engineering, Chongqing University, Chongqing 400045, China

摘要

    摘要
  • 摘要: 针对周期性干湿循环作用下岩石损伤劣化问题,以三峡库区某边坡的中风化砂岩为研究对象,分别对不同干湿循环次数作用下“干燥”和“饱和”状态的砂岩进行全断面CT扫描试验、巴西劈裂试验、单轴和三轴压缩试验。试验结果表明：在相同的干湿循环次数n下,“干燥”状态下砂岩的宏细观力学参数大于“饱和”状态下的参数;各典型区域的CT数均值随着循环次数非线性累积增加,初期变化较快,当n≥3时,细观损伤演化速度趋于缓慢;砂岩单轴抗压强度、弹性模量、抗拉强度、黏聚力、内摩擦角随n的增加呈对数下降,泊松比随n的增加而增大。干湿循环作用对砂岩不同力学参数的劣化程度不一,岩样“抵抗拉伸性能”大于“抵抗压缩性能”对水的敏感性。基于试验数据拟合,对不同干湿循环作用下两种含水状态的砂岩M-C屈服准则进行了修正,为工程中获得任意围压下岩石的破坏强度提供了理论依据。
    Abstract: The intermediary weathered sandstone of a slope in the Three Gorges Reservoir area is taken as the research object when investigating the damage and degradation of rock under periodic wetting-drying cycles. The full section CT scan, Brazil disk split tests and uniaxial compression tests on sandstones under different wetting-drying cycle times (n) are performed respectively. The results show that the macro mesoscopic mechanical parameters of dry sandstone are greater than those of wet sandstone under the same wetting-drying cycle times. The mean values of CT numbers in typical areas nonlinearly and cumulatively increase with the increase of wetting-drying cycle times. They change faster initially, and the mesoscopic damage evolution rate tends to slow down when the wetting-drying cycle times exceed three. The uniaxial compressive strength, elasticity modulus, tensile strength, cohesion and internal friction angle of sandstone decrease logarithmically with the increase of wetting-drying cycle times, while the Poisson's ratio of sandstone increases as the wetting-drying cycle times increase. The role of wetting-drying circulation on deterioration degree of different mechanical parameters of sandstone is variant. The sensibility of tensile properties of sandstone specimen to water is greater than that of compression properties of sandstone one. The M-C yield criterion of sandstone under dry and wet conditions is corrected respectively based on the data regression analysis, thus providing a theoretical basis for the breaking strength acquisition of rock under arbitrary confining pressure.
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出版历程
  • 收稿日期:  2016-09-25
  • 发布日期:  2017-09-24

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