透水石对GEO-Experts土水特征曲线压力板仪排水的影响

利用GEO-Experts应力相关的土水特征曲线压力板仪测定土水特征曲线时,预固结过程必须用到透水石。通过对南昌重塑饱和土样的脱水试验发现,试验过程中透水石中的水和土样中的水一样也会被排到量管里,由排出到量管中水量去反算试样含水率,得到的含水率是不真实的,这使得基质吸力相对应的土样含水率偏小。为减小试验误差,进行了6种不同处理方案试验。结果表明,在透水石下放置一层防水透气膜可以有效减少试验误差,得出的土水特征曲线更准确。最后利用这个最佳方案进行不同固结压力下的脱湿和吸湿试验。 

Influence of permeable stones on GEO-Experts SWCC pressure plate apparatus

Pre-consolidation process must use permeable stones when GEO-Experts stress-related soil water characteristic curve pressure plate apparatus is used to measure the soil-water characteristic curves. Dehydration test results found that the water of permeable stones and soil samples was discharged to the measuring tubes with remolded saturated soil samples of Nanchang city. The water content of the sample is to back calculated from the the water yield discharged to the measuring tubes. Thus the obtained water content of the sample is not true, causing smaller water content corresponding to matric suction. In order to reduce experimental error, there are six different treatment programs for permeable stones. The results found that the testing program using breathable waterproof membrane under permeable stones can effectively reduce experimental error. In that case, oil-water characteristic curves are more accurate. Finally, under different consolidation pressures, the drying and wetting tests were conducted with the optimal program.