荷载作用引起砂土渗透性变化的试验研究

模拟路基填土与开挖卸载的实际情况，研制了压力变化条件下砂土和黏土渗透性变化的室内试验装置与试验方法。通过测定砂土在加载与卸载过程下，不同压实度（与初始孔隙比对应）土样的渗透系数变化特点，得出了荷载、压实度（或初始孔隙比）与土体渗透系数的相互关系，探讨了荷载压力的变化引起土体渗透系数变化的原因，结果表明，荷载与初始孔隙比对渗透系数均有很大影响，其中荷载对低压实度的土体渗透性影响最大，而对高压实度的土体渗透性影响较小，以此为依据探讨了路基填土与开挖对地基渗流的影响特点。

Experimental study of influence of compressive stress on water permeability of sands soils

Considering the practice of embankment construction, the experimental device and experiment method to prepare experimental samples with different compactnesses to measure water permeability of sands soils or clay under compressive load changes was manufactured. According to the measurement of variations of water permeability under compressive load or unload in different compactnesses, the rule of water permeability of sand soil was revealed due to be influenced by different compressive loads and different compactnesses. It is shown that the compressive load and compactness both influence the water permeability of the sand soil greatly; but the factor of compressive load influences, its water permeability more greatly. Especially for the low compactness soil, the influence of the load on the permeability is very obvious.