含有机质黏土全吸力范围内土-水特征曲线试验研究  

Experimental Study on Soil-Water Characteristic Curve within the Full Suction Range of Organic Matter Clay

作　　者：宋泽宇 蒲力 马云飞 SONG Zeyu;PU Li;MA Yunfei(School of Architectural Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500

出　　处：《水力发电》2024年第10期114-118,共5页Water Power

摘　　要：为研究全吸力范围内有机质含量对黏土保水特性的影响,以膨润土为基质,添加泥炭制备不同有机质含量土样,采用压力板法、滤纸法、蒸汽平衡法,对其进行土-水特性试验,从而获得全吸力范围内土-水特征曲线。试验结果表明:3种不同吸力测试可准确反映出含有机质黏土全吸力范围内的土-水特征曲线;有机质能够影响黏土的保水性,但在一定的吸力范围内,含有机质黏土的保水性还与孔隙结构和孔隙中水的形态相关;随着土中有机质含量的增加,土样的进气值和残余值与有机质含量呈线性关系,土的保水能力变强。In order to study the influence of organic matter content on the water-holding characteristics of clay in the full suction range,soil samples with different organic matter contents are prepared by adding peat with bentonite as the matrix,and the soil-water characteristics are tested by the pressure plate method,the filter paper method and the vapor equilibrium method,so as to obtain the soil-water characteristic curves in the full suction range.The experimental results show that,(a)the soil-water characteristic curves of the organic clay can be accurately reflected by the three different suction tests;(b)the organic matter can affect the water retention of the clay,but the water retention of the organic clay is also related to the pore structure and the morphology of water in the pores within a certain suction range;and(c)with the increase of organic matter content in the soil,the air inlet value and residual value of the soil sample are linearly related to the organic matter content,and the water holding capacity of the soil becomes stronger.

关 键 词：含有机质黏土 土-水特征曲线 压力板法 滤纸法 蒸汽平衡法 

分 类 号：TU446[建筑科学—岩土工程]