千枚岩全风化土的持水特性研究  

Soil Water Retention Characteristics of Phyllite Completely Weathered Soil

作　　者：刘莉 姜大伟 于明波 颜荣涛[1] 于海浩[1] 陈波 LIU Li;JIANG Dawei;YU Mingbo;YAN Rongtao;YU Haihao;CHEN Bo(Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin University of Technology,Guilin 541004,China;Guilin Geological Engineering Investigation Instituteof China Building Materials Group Limited Company,Guilin 541004,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;Shandong High Speed Taian Development Group Limited Company,Taian 271000,China)

机构地区：[1]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004 [2]中国建材集团建材桂林地质工程勘察院有限公司,广西桂林541004 [3]河海大学土木与交通学院,江苏南京210098 [4]山东高速泰安发展有限公司,山东泰安271000

出　　处：《河南科技大学学报（自然科学版）》2022年第6期53-58,M0006,共7页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(51309055);广西自然科学基金项目(2017GXNSFAA198215)。

摘　　要：以桂林龙胜地区千枚岩全风化土为研究对象,使用压力板仪和饱和盐溶液法两种方法测试广吸力范围内的土水特征曲线,研究了干密度和干湿循环作用对土体持水性的影响规律。试验结果表明:干密度增大,土水特征曲线差异性主要表现在过渡区曲线上移,土体的进气值与残余含水率增加。随干湿循环次数的增加,进气值与残余含水率先降低,在3次循环之后达到稳定状态。压汞试验揭示随干湿循环的进行,曲线向大孔隙方向移动,在3次循环后曲线变化较小,解释了千枚岩全风化土持水性先降低3次后稳定的状态。利用毛细管模型,根据孔隙分布曲线计算了不同干湿循环下试样的土水特征曲线,土样的实测值与预测值较为接近。In order to study the soil-water characteristic curve(SWCC) of phyllite completely weathered soilin full suction range, two suctioncontrol or measurement methods of the pressure plate method and filter paper method were used to study the influence of dry density and dry wet cycle on the SWCC. The result shows that the upward movement of SWCC is mainly reflected in the transition zone with high dry density, and the air entry value and residual moisture content are high.With the number of times of dry and wet cycle jncreases,the air entry value and residual moisture content are reduced first and then reaches a stable state after three cycles with high dry wet cycle.The curve determined by mercury injection test moves towards macropores with high dry wet cycle and the curve changes little after three cycles, which explains the state that the water holding capacity of phyllite completely weathered soil decreases for three times and then becomes stable. The SWCC with different dry and wet cycles are calculated according to the pore distribution curve by using the previous capillary model,which can provide a new way for the prediction of soil water characteristic curve of phyllite completely weathered soil.

关 键 词：千枚岩全风化土 土水特征曲线 压汞试验 毛细管模型 

分 类 号：TU312.1[建筑科学—结构工程]