贝壳填料渗透特性的实验研究

Experimental study on permeability characteristics of the shell filler

为充分了解贝壳的渗透性能,提高资源利用率,以达西定律为依据,通过常水头渗透实验,探究贝壳不同粒径时其体积密度、孔隙度的变化规律及渗透系数k的影响。结果表明:在混合组中,由于小粒径贝壳能够充分混合在大粒径贝壳中,使得混合组的体积密度明显增加,而孔隙度减小;在混合组中随着贝壳粒径的增大,孔隙度和渗透系数均增大,两者之间存在正相关性,渗透效果也越好;不同粒径的贝壳混合后对渗透系数的影响显著,小粒径贝壳和大粒径贝壳混合对渗透系数影响更为明显。

In order to investigate the influences of permeability characteristics of shells and enhance the resoureces utilization efficiency, the effects of different grain sizes of shells on volumetric density, porosity and the permeability coefficient K were discussed with constant head permeability tests on the basis of Darcy＇s law. The results showed that ： In the mixed group, the mixture of shells with different grain sizes induced the increase of the volumetric density and the decrease of porosity due to the fully blend of smaller - sized shells in larger - sized ones ; Both the porosity and the permeability coefficient increased, and were proportionally to the general grain size of mixed shells, showing better permeability ; The mixture of the different grain sizes on permeability coefficients was noticeable, and the influence of mixing small shells with larger ones on permeability coefficients was more significnat.