土质.用刚性壁渗透计测定饱和疏松材料的水渗透性

[中文适用范围]： 本国际标准规定了使用恒水头法测定粒状土壤（例如沙子和砾石）的水力传导率，该方法涉及刚性壁渗透计来测量水的层流。 该程序建立了颗粒土壤的水力传导率的代表值，这些颗粒土壤可能出现在堤坝中的天然沉积物中，或用作人行道下的基层时。 为了限制测试过程中固结的影响，该程序仅适用于通过 75 μm 筛的土壤含量不超过 10% 的扰动粒状土壤。 该程序适用于含有少量或不含淤泥的沙子和砾石压实样品的水力传导率测量，其中沿渗透计刚性壁的流动对测试结果没有实际影响。 本国际标准不适用于边界处渗漏/流动不可接受的淤泥和粘土。 [外文原描述]： ISO 17312:2005 specifies the determination of the hydraulic conductivity of granular soils (e.g. sand and gravel) using a constant-head method involving a rigid-wall permeameter to measure the laminar flow of water. The procedure establishes representative values of the hydraulic conductivity of granular soils that can occur in natural deposits as placed in embankments, or when used as base courses under pavements. In order to limit consolidation influences during testing, this procedure is applicable only to disturbed granular soils containing not more than 10 % soil passing a 75-micrometre sieve. ISO 17312:2005 is applicable to the measurement of hydraulic conductivity of compacted samples of sands and gravels containing little or no silt, where flow along the rigid wall of the permeameter has no practical implications on the test results. ISO 17312:2005 is not applicable to silt and clay, where seepage/flow at the boundaries is not acceptable.