• 全国中文核心期刊
  • 中国科技核心期刊
  • 美国工程索引(EI)收录期刊
  • Scopus数据库收录期刊
蔡国庆, 韩博文, 王亚南, 江天, 谢琳, 张策. 双孔结构非饱和红黏土土水特征曲线模型[J]. 岩土工程学报, 2022, 44(S1): 1-5. DOI: 10.11779/CJGE2022S1001
引用本文: 蔡国庆, 韩博文, 王亚南, 江天, 谢琳, 张策. 双孔结构非饱和红黏土土水特征曲线模型[J]. 岩土工程学报, 2022, 44(S1): 1-5. DOI: 10.11779/CJGE2022S1001
CAI Guo-qing, HAN Bo-wen, WANG Ya-nan, JIANG Tian, XIE Lin, ZHANG Ce. SWCC model for double-pore structured unsaturated clay[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(S1): 1-5. DOI: 10.11779/CJGE2022S1001
Citation: CAI Guo-qing, HAN Bo-wen, WANG Ya-nan, JIANG Tian, XIE Lin, ZHANG Ce. SWCC model for double-pore structured unsaturated clay[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(S1): 1-5. DOI: 10.11779/CJGE2022S1001

双孔结构非饱和红黏土土水特征曲线模型

SWCC model for double-pore structured unsaturated clay

  • 摘要: 为了真实反映土体内部双孔结构和变形对土持水特性的共同影响,推导建立了考虑变形的双孔结构非饱和土土水特征曲线模型。模型提出以双孔土水特征曲线中的“相接点”作为“双孔”结构非饱和土大小孔隙尺度分界点,并针对不同区间的土水特征曲线分别建立方程。在各分段方程中引入体变参数用来反映不同初始孔隙比下SWCC的变形。采用桂林红黏土压实样,在全吸力范围内开展了土水特征曲线试验,在各级吸力平衡后对土样进行压汞试验,对所建立模型进行验证。结果表明,所建立考虑双孔结构非饱和土土水特征曲线模型对红黏土干化与湿化过程均具有良好的适用性和良好的预测效果,可以反映不同初始孔隙比和不同结构土样在相同水力路径下的水力行为。

     

    Abstract: Some mercury intrusion test results show that the soils using the compaction sample preparation method usually present a typical double-pore micro structure, while the existing unsaturated SWCC models are mostly directed to single-pore structural soils. In order to reflect the double-pore structure inside the soils and the joint effects of deformation on water-holding performance, a unsaturated SWCC model for the double-pore structure considering deformation is proposed and verified through experiments. The "junction point" in the double-pore SWCC is regarded as the boundary point of different pore sizes of the double-pore structured unsaturated soils, and equations for the SWCC of different sections are established. The parameter is introduced in the segment equation to reflect the influences of the deformation. According to the compacted samples of Guilin lateritic clay, the SWCC tests in the full suction range are carried out based on the shaft translation technique, the filter paper method and the saturated salt solution steam balance method. The model parameters are calibrated, and the proposed model is verified.

     

/

返回文章
返回