摘要
采用变水头法和定水头法分别测试水泥稳定土的渗透系数,对比水泥掺量和龄期的影响,同时利用压汞法,测试不同龄期的水泥稳定土的孔结构,分析孔结构与渗透性的关系。研究结果表明,两种方法结果所呈现出来的规律总体一致,数量级相差一级;渗透系数随龄期延长而降低,早期降低较多,28 d后趋于稳定,水泥用量增加,渗透系数降低明显,且水泥用量为10%时,性价比较高。水泥土的孔结构随龄期延长和水泥用量的增加,趋于细化,平均孔径和孔隙率均降低,有利于渗透性能的提高。另外,水工法和土工法两种方法测得的相对渗透系数与孔结构特征参数的规律基本一致,大致呈正相关。
The permeability coefficient of cement stabilized soil is tested by variable water head method and constant water head method respectively,and the influence of cement dosage and age is compared.At the same time,the pore structure of cement stabilized soil at different ages is tested by mercury intrusion method,and the relationship between pore structure and permeability is analyzed.The results show that the results of the two methods are generally consistent,with an order of magnitude difference of 1;the permeability coefficient decreases with the extension ofage,and decreases more in the early stage,and tends to be stable after 28 days,with the increase of cement dosage,the permeability coefficient decreases significantly,and the cost performance is higher when the cement dosage is 10%.The pore structure of cement soil tends to be refined with the increase of age and cement content,and the average pore size and porosity decrease,which is conducive to the improvement of permeability.In addition,the relative permeability coefficient measured by hydraulic method and geotechnical method is basically consistent with the characteristic parameters of pore structure,and roughly positively correlated.
作者
陶作杰
梁小刚
杨哲
杨虎
TAO Zuo-jie;LIANG Xiao-gang;YANG Zhe;YANG Hu(Mengcheng County Urban Development Investment Holding Group Co.Ltd.,Bozhou 233500,China;Anhui Huaihe River Administration Bureau,Bengbu 233000,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China)
出处
《工程建设与设计》
2023年第11期164-167,共4页
Construction & Design for Engineering
基金
中央级公益性科研院所基本科研业务费专项资金(Y421009)
江苏省自然科学基金(BK20201126)。
关键词
水泥稳定土
孔结构
变水头
定水头
渗透
cement stabilized soil
pore structure
variable head
constant head
permeability
