摘要
有效孔隙度是地下水运移及污染物迁移扩散分析中重要的水文地质参数,为获取天津地区潜水含水层有效孔隙度的参考值,利用改进的室内一维土柱示踪渗透装置进行了含水层介质有效孔隙度的测试与探究。结果表明:利用土柱示踪渗透试验测试天津地区粉土、粉砂介质的有效孔隙度是可行的。受介质平均粒径d_(50)、不均匀系数C_(u)及颗粒级配等因素的影响,测得的不同含水层介质和不同场地相同含水层介质的有效孔隙度存在一定的差异。通过土柱示踪渗透试验,可得天津地区粉土、粉砂介质有效孔隙度的参考值范围分别为18.99%~24.12%和28.66%~33.26%。在实际应用过程中,可在考虑介质颗粒大小及颗粒不均匀程度等因素的基础上,结合此次试验结果在合理范围内进行取值。
Effective porosity is an important hydrogeological parameter in the analysis of groundwater flow,pollutant migration and diffusion.In order to obtain the reference value of effective porosity of the unconfined aquifer in Tianjin area,the effective porosity of the aquifer medium was tested and explored by the improved one-dimensional soil column tracer permeability device in laboratory.The results show that it is feasible to measure the effective porosity of silt and silty sand by soil column tracer permeability test in Tianjin area.The effective porosity of different aquifer media and the same aquifer media of different sites are different due to the influence of average particle size d_(50),non-uniformity coefficient C_(u)and particle size distribution.According to the soil column tracer permeability experiment,the empirical values of effective porosity of silt and silty sand in Tianjin area are 18.99%~24.12%and 28.66%~33.26%respectively.In practical application,considering the size of medium particles and the degree of non-uniformity of particles and other factors,the value can be determined within a reasonable range according to the test results.
作者
梁玉凯
符亚兵
林广宇
刘汉强
焦志亮
Liang Yukai;Fu Yabing;Lin Guangyu;Liu Hanqiang;Jiao Zhiliang(Tianjin Survey Design Institute Group Co.,Ltd.,Tianjin 300191,China)
出处
《工程勘察》
2022年第1期34-39,共6页
Geotechnical Investigation & Surveying
关键词
土柱渗透试验
潜水含水层
有效孔隙度
天津地区
permeability experiment of soil column
unconfined aquifer
effective porosity
Tianjin area
