压实度和干湿循环对豫东粉土土-水特征曲线的影响-《郑州大学学报(工学版)》

文章信息/Info

Title:: Influence and prediction of compaction degree and drying-wetting cycle on soil water characteristic curve of Yudong silt

作者:: 张涛; 乐金朝; 张俊然; 1.郑州大学水利与环境学院，河南郑州450001;2. 河南交通职业技术学院建筑工程系，河南郑州451400;3.华北水利水电大学河南省岩土力学与结构工程重点实验室,河南郑州,450045

Author(s):: Zhang Tao1; Le Jinchao2; Zhang Junran3; 1. School of Water Conservancy and Environment, Zhengzhou University, Zhengzhou 450001, Henan; 2. Department of Architectural Engineering, Henan Communication Vocational and Technical College, Zhengzhou 451400, Henan; 3.North China University of Water Conservancy and Hydropower, Henan Province Rock and Soil Mechanics Key Laboratory of Engineering and Structural Engineering, Zhengzhou, Henan, 450045

Keywords:: compaction degree; drying-wetting cycle; Yudong silt; soil water characteristic curve; prediction

摘要:: 用GCTS公司土-水特征压力板仪对不同压实度和多次干湿循环后的豫东粉土进行的土-水特征曲线试验。试验结果表明：当吸力小于100 kPa时，土-水特征曲线的脱湿和吸湿曲线具有明显的滞回特性；当吸力大于100 kPa时，滞回特性不明显。土-水特征曲线用含水率和吸力关系表示时，含水率随着压实度和干湿循环次数的增大，脱湿和吸湿曲线均向左下方偏移；土-水特征曲线用饱和度和吸力关系表示时，脱湿和吸湿曲线随着压实度的增加均向右上方偏移，并随着干湿循环次数的增加向左下方偏移。用Matlab中的Lsqcurvefit函数对试验数据进行拟合并得到Van Genuchten模型中的拟合参数。

Abstract:: A series of the soil-water characteristic curve ( SWCC) tests for Yudong silt with different compac-tion degree and wetting-drying cycles were conducted by the pressure plate apparatus with the GCTS model. The test results showed that the SWCC curves had obvious hysteresis phenomenon during the drying and wet-ting cycles when the value of the suction was less than 100 kPa. While the value of the suction was greater than 100 kPa, the SWCC hysteresis phenomenon was not obvious. The SWCC was expressed by the relations between suction and water content, the SWCC curves have a shift to the bottom and left trend with the increase in the compaction degree and drying-wetting cycles. When the SWCC is expressed by the relations between suction and saturation, the SWCC curves had a shift to the top and right trend with the increase in the compac-tion degree, while the SWCC curves had a shift to the bottom and trend with the increase in the wetting-drying cycles. The Lsqcurvefit function of the Matlab was adopted for fitting of the SWCC curves to get the fitting pa-rameters of the Van Genuchten model. Through the relations between the fitting parameters and the compaction degree or drying-wetting cycles, the practical methods were proposed to predict the Yudong silt SWCC with different compaction degree or drying-wetting cycles.