压实膨胀土入渗特征试验研究  

Experimental study on infiltration characteristics of compacted expansive soil

作　　者：温静宇 安梦琪 秦天 WEN Jingyu;AN Mengqi;QIN Tian(College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450046,China)

机构地区：[1]华北水利水电大学地球科学与工程学院,河南郑州450046

出　　处：《水利水电快报》2025年第1期96-103,共8页Express Water Resources & Hydropower Information

摘　　要：为研究不同压实度变化下膨胀土入渗特征及规律,通过自制亚克力桶实验装置,以不同干密度膨胀土为研究对象,开展一维竖向膨胀土柱渗流试验,分析其对膨胀土水分运移规律的影响。结果表明:①入渗速率、湿润锋前进速率与膨胀土压实度呈负相关,即在相同入渗时间内,随着压实度的增大,累积入渗量减少,湿润锋向前推进的距离减小;②各测点含水率的变化规律相似,均有平稳、迅速增长、达到高峰、保持平稳4个时期;③随着水分入渗土柱产生膨胀,土柱顶部膨胀量大,底部膨胀量小,膨胀现象与湿润锋前进响应一致,但膨胀现象存在滞后,且与压实度呈正相关。研究成果对于理解膨胀土的入渗特性和规律具有重要意义。In order to study the infiltration characteristics and laws of expansive soil under different compaction degrees,the seepage test of one-dimensional vertical expansive soil column was carried out with different dry density expansive soil as the research object in a self-made acrylic barrel experimental device,and the influence of different compaction degrees on water transport in expansive soil was analyzed.The results show that:①The infiltration rate,advancing rate of the wetting front,and the compaction degree of expansive soil were negatively correlated.Within the same infiltration time,as the compaction degree increased,the cumulative infiltration amount would decrease and the distance of the wetting front advancing would decrease.②The variation pattern of moisture content at each measuring point was similar,with four periods of steady,rapid growth,reaching peak,and maintaining stability.③As water infiltrated into the soil column,it expanded with a larger expansion at the top and a smaller expansion at the bottom.The expansion phenomenon was consistent with the response of the wetting front,but there was a lag in the expansion phenomenon,which was positively correlated with the compaction degree.The research results can provide a reference for understanding the infiltration characteristics and laws of expansive soils.

关 键 词：膨胀土 垂直入渗 干密度 湿润锋 模型试验 

分 类 号：TU443[建筑科学—岩土工程]