摘要
为确定埋地成品油管道小孔泄漏事故在土壤中产生的油品污染范围,需确定泄漏油品与土壤间的特征关系,即土壤孔隙压力与污染物饱和度间的特征函数关系曲线。选取北京市昌平地区三种不同粒径的地表层土壤作为实验待测土壤,使用离心机法对土壤水分特征曲线和土壤0^#柴油特征曲线进行实验测量,将实验结果导入RETC软件,拟合多种土壤水分特征曲线数学模型,均得到较好的拟合结果(R2>0.97),并量化模型中各参数随土壤粒径变化关系。由实验及软件计算结果分析得出:与水分相比,土壤对0^#柴油的持有能力更高,且0^#柴油对土壤进气压力值和粒径的变化更为敏感,相同土壤条件下0^#柴油比水分排空压力更低、排空速度更快,入渗扩散范围也更大;当土壤粒径减小时,土壤的相对表面积值增加,基质势能变大,因此对0^#柴油和水的持有力均呈增加趋势,所以粒径较小的土壤(如粉土和黏土)可以在相同的外界环境下更为有效地持有0^#柴油等成品油污染物,降低由于管道小孔泄漏等事故泄漏流出的成品油的扩散范围。
In order to determine the range of oil pollution generated by product pipeline small-hole leakage accidents,it is necessary to determine the characteristic relationship between leakage oil and soil,namely the characteristic function relationship curve between soil pore pressure and pollutant saturation.Three kinds of soil with different particle sizes in Changping Area of Beijing are selected as experimental soils,and the soil water characteristic curve and soil 0^#diesel characteristic curve are experimentally measured by the centrifuge method.The experimental results are imported into RETC software to fit a variety of mathematical model for soil water characteristic curve,which all obtain good fitting results(R2>0.97),and the relationship between each parameter in the model varied with soil particle size is quantified.From the experiment and software calculation results,it is concluded that compared with water,soil has a lower holding capacity for 0^#diesel and is more sensitive to changes in soil inlet pressure and particle size.Compared with water,0^#diesel's venting pressure is lower,venting speed is faster,and the infiltration diffusion range is larger under the same soil conditions.When the soil particle size decreases,the relative surface area of soil increases,the potential energy of matrix becomes larger,and so the holding capacity of 0^#diesel and water increases.Therefore,soils with smaller particle sizes such as silt and clay can more effectively hold the oil pollutants such as 0^#diesel in the same external environment and reduce the diffusion range of the product oil that leaks out due to accidents such as small-hole leakage of pipeline.
作者
王逍
刘胜利
梁博文
WANG Xiao;LIU Shengli;LIANG Bowen(China University of Petroleum(Beijing);Petroleum Engineering Department of Yangtze University)
出处
《油气田地面工程》
2019年第9期1-7,共7页
Oil-Gas Field Surface Engineering
关键词
成品油管道
泄漏
模型参数
特征曲线
饱和度
product oil pipeline
leakage
model parameter
characteristic curve
saturation level
