堆石料是土石坝的主要填筑材料,其湿化变形特性对土石坝蓄水期变形有显著影响。对两河口水电站的2种筑坝堆石料,采用单线法分别开展围压为0.5、1.0、2.0、3.0 MPa的大型三轴湿化变形试验。结果表明:随着应力水平和围压增加,堆石料轴向湿化变形和体积湿化变形都显著增大,与中低围压下的湿化变形规律相近。高围压下的各向等压湿化变形,堆石料体积湿化应变与围压在双对数坐标中仍服从直线关系,轴向湿化应变与围压不再满足直线关系。高围压下的偏压湿化变形,堆石料体积湿化应变与轴向湿化应变之比一般在0~2范围内,与围压呈现近似水平发展趋势,随应力水平的增加而逐渐降低。采用六参数湿化模型,仍能准确表达轴向湿化变形、体积湿化变形随应力水平、围压的变形规律。
Abstract
Rockfill serves as the primary filling material in earth rock dams. Its wetting deformation characteristics have a significant influence on dam deformation during impoundment. Employing the single line method, we conducted extensive indoor triaxial wetting deformation tests under confining pressures of 0.5, 1.0, 2.0, and 3.0 MPa on two types of rockfill materials sourced from Lianghekou Hydropower Station. Results indicate a substantial increase in both axial and volumetric wetting deformations as stress levels and confining pressures escalate. This behavior aligns with wetting deformation patterns observed under medium and low confining pressures. Notably, under high isotropic confining pressure, volumetric wetting strain correlates linearly with confining pressure in double logarithmic coordinates, whereas axial wetting strain and confining pressure no longer meet a linear relationship. Moreover, at high unsymmetrical confining pressures, the ratio of volumetric wetting strain to axial wetting strain typically ranges from 0 to 2, exhibiting a nearly horizontal trend with increasing confining pressure. The six-parameter wetting model remains adept at accurately characterizing the axial and volumetric wetting deformation behaviors under varying stress levels and confining pressures.
关键词
堆石料 /
湿化变形 /
单线法 /
高围压状态 /
应力水平
Key words
rockfill /
wetting deformation /
single-line method /
high confining pressure state /
stress level
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参考文献
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基金
国家自然科学基金-西藏联合基金重点项目(U21A20158);国家自然科学基金-雅砻江联合基金重点项目(U1765203);国家自然科学基金面上项目(51979010)
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