湿陷性黄土试坑浸水试验中土压力及含水量变化分析

Changes of Soil Pressure and Water Content of Collapsible Loess During Water Immersion Tests

湿陷性是黄土的重要性质之一,湿陷性黄土遇水发生湿陷变形的过程中,黄土土层的土压力及含水量相应的发生一系列变化。通过湿陷性黄土现场试坑浸水试验,利用布设在试坑内及试坑周围埋设的传感器和张力计等监测仪器,对试验过程中黄土土层的土压力及含水量的变化过程做了信息采集记录,分析了其变化方式及规律。研究结果表明,在试验过程中黄土土层的土压力及基质吸力均呈降低趋势;在黄土湿陷变形过程中,沉降或突降的时间点一般是在土层压力最小或接近最小,含水量达到或接近饱和的时段。

Collapsibility is one of the important properties of loess. When collapses of loess occurred, soil pressure and water content changed correspondingly in sequences. In this study, water immersion tests were conducted with the collapsible loess in a field trial pit. With deployment of the sensors and tension meters in and around the experimental site, a large amount of data was collected regarding the changing patterns and rules of soil pressure and water content. The results show that the soil pressure and matric suction in the lo- ess layers decreased during the experiment. During the deformation, abrupt subsidence of loess often oc- curred when the soil pressure was reaching its minimum and the water content was close to saturation.