摘要
砂土中掺入泥浆、膨润土、水泥可降低砂土的渗透系数,通过室内配合比试验,可得到满足密封墙渗透性能要求的配合比。在成层土平均渗透系数理论的基础上,建立砂土密封墙渗透系数理论。混合土的渗透系数由细粒土的渗透系数及厚度控制,膨润土通过吸水膨胀作用,主要改变混合物的渗透系数;水泥与土中孔隙水发生水化反应,主要改变细粒土的渗透系数。结果表明,根据砂土密封墙渗透系数理论可计算出混合土的细粒土厚度、掺入膨润土后混合土中混合物的渗透系数、掺入水泥后混合土中细粒土渗透系数。
The permeability coefficient of sand soil can be reduced by mixing mud,bentonite,and cement,meanwhile the mix proportion meeting the permeability requirements of the sealing wall can be obtained by the indoor mix proportion test.Based on the theory of average permeability coefficient of layered soil,the theory of permeability coefficient of the sand sealing wall is established.The permeability coefficient of the mixed soil is controlled by the permeability coefficient and thickness of the fine-grained soil.The permeability coefficient of the mixture is mainly changed by the water absorption and expansion of the bentonite,and the hydration reaction between cement and pore water in the soil mainly changes the permeability coefficient of the fine-grained soil.The results show that the thickness of fine-grained soil,the permeability coefficient of the mixture with bentonite,and the permeability coefficient of fine-grained soil mixed with cement can be calculated by the theory of permeability coefficient of sand sealing wall.
作者
冯刚
牛飞
FENG Gang;NIU Fei(CCCC Fourth Harbor Engineering Co.,Ltd.,Guangzhou 510230,China;CCCC Fourth Harbor Engineering Institute Co.,Ltd.,Guangzhou 510230,China;CCCC Key Laboratory of Environmental Protection&Safety of Communications Foundation Engineering,Guangzhou 510230,China)
出处
《水运工程》
北大核心
2021年第6期233-237,共5页
Port & Waterway Engineering
关键词
密封墙
砂土
泥浆
膨润土
水泥
渗透系数
sealing wall
sand
mud
bentonite
cement
permeability coefficient
