珊瑚砂含水介质水理性质的实验室测定

Measurement of the hydrological properties of coral sand in a laboratory

从西沙群岛采集了29 kg珊瑚砂样,采用常规方法测定了珊瑚砂的孔隙度、渗透系数、给水度以及弥散系数.对渗透系数进行了多组测定试验,并对每组砂样渗透系数值的差异进行了分析,在进行弥散系数的测定试验中,通过观测不同位置处的弥散系数分析了弥散系数的尺度效应.实验结果表明,珊瑚砂含水介质具有颗粒大小不均、结构疏松、透水性好等特点.

The porosity, permeability coefficient, specific yield and dispersion coefficient of 29 kg of coral sand collected from the Xisha Islands were examined using the conventional methods. Several experiments were conducted in order to determine the permeability coefficient of the coral sand, and the differences between the permeability coefficients of each group of coral sand were analyzed. Meanwhile, the scale effect of the dispersion coefficient was analyzed by determining the coefficients at different locations. The results show that the coral sand, as an aquifer medium, has heterogeneous grain size, loose structure and high permeability.