灌溉条件下未饱和黄土浸水湿陷性试验研究

针对输水管道工程通过黄土高原可能遇到的黄土湿陷性问题,在以往研究较少的已灌溉厚层黄土区进行黄土湿陷性试验,研究范围由以往的黄土厚度不大于20 m的一、二级阶地扩展到黄土厚度更大的(50~60 m)三级阶地。通过野外大型原位试验,对黄土的湿陷深度、剩余湿陷量进行分析研究,结果表明,黄土湿陷性的下界远不止10 m,在厚层黄土分布区黄土具有多级湿陷性。

Test and Study on Wet Sinking of Unsaturated Loess under Irrigation Condition

It conducts wet sinking tests of loess in the loess region where had little study before in the light of wet loess sinking issue which might be met by a delivery pipeline project crossing through the Loess Plateau.The study scope of thickness of loess starts from terraces stage 1 and 2 that usually is less than 20 m to terrace 3 where the thickness is greater(50~60 m).It analyzes and studies the wet sinking depth and surplus volume of wet sinking of loess through large-scale in situ tests.The outcomes show that the lower bound of wet sinking loess is deeper than 10 m and has multi-level wet sinking in the thick loess region.