斥水土壤斥水度变化规律及影响因素试验研究

将十八烷基伯胺与土壤按不同质量比混合,获得不同斥水度的人为斥水化土壤.采用滴水穿透时间法测定斥水土壤斥水度,并开展不同温度、土壤含水率、溶剂等作用下的土壤斥水度变化规律试验.结果表明:十八烷基伯胺使土壤产生斥水性属于表面物理作用,对土壤颗粒本身化学性质无影响;人为斥水化土壤中十八烷基伯胺含量越高,土壤斥水度越大.在0～...

Experimental study on variation law and influencing factor of water repellency of water-repellent soil

In order to obtain artificially water-repellent soils with different water repellencies，octadecylamine is mixed with soil in accordance with different mass ratios． The water repellency of the water-repellent soil is measured by the method of drip penetration time，and then the experiments on the variation laws of the water repellencies of the water-repellent soil under the effects of different temperatures，different soil water contents，different solvents，etc． are carried out． The results show that the water repellency of soil caused by octadecylamine belongs to a surface physical effect without any impacts on the chemical properties of the soil particles themselves，while the higher the content of octadecylamine in the artificially water-repellent soil is，the larger the water repellency in the soil is to be． Within the temperature range of 0～ 105℃，the variation law of the soil water repellency is to be increased at first and then decreased along with the temperature rise，which is to reach the peak value when the temperature is 75℃ ． Within the interval from the dry status to the saturated status，the higher the soil water content is，the variation law of the soil water repellency is to be increased at first and then decreased，while the soil water repellency is to sharply drop and even disappear when the water content reaches a certain value． The water repellency of the water-repellent soil can be significantly decreased by strong corrosive solution ( hydrochloric acid) ，by which the soil can even be changed into a kind of hydrophilic soil，thus toilet detergent，detergent and other household detergents can lower the soil water repellency，while ethanol and acetone have little impacts on the properties of the water-repellent soil．