为了探究喷雾法制备压实膨润土试样目标含水率的可靠性,考虑加水量(目标含水率)、静置时间、压实力这3个因素对压实试样实际含水率的影响,设计正交试验方案,测定试样上、下部含水率。试验结果表明:①试验成果中出现异常数据,表明该法在配制过程中存在人为性,需剔除异常数据再分析;②随着加水量增加,压实试样上部和下部含水率均由大于目标含水率演变为小于目标含水率,加水造成局部团聚现象减弱,拌料过程中水量损失增加;静置时间和压应力显著影响压实试样内含水率均匀度。由于喷雾法相对其他方法具有时间优越性,在剔除异常试验数据后,该法是值得推荐的,但膨润土拌制过程中,存在水量损失,建议在使用前进行实际含水率校正。

To investigate the reliability of spraying method for precisely preparing compacted bentonite samples with target water content, the water content at both upper and lower parts of compacted specimen was measured. Since orthogonal test method could reduce test times and shorten test cycles, nine orthogonal experiments were designed to study the influences of added water quantity (target water content), curing time, and compaction force on water content, with the help of the orthogonal table. Results imply that specific abnormal data indicates that the spraying method is artificial in the process of compounding, hence should be removed firstly. Moreover, with the increase of water addition, water content at both upper and lower parts of the compacted specimen decreased to be smaller than the target water content; local agglomeration was weakened, and water loss intensified. Curing time and compaction force have significant influences on the uniformity of water content in compacted specimens. As the spraying method is superior to other methods in terms of time, it is worth recommending after abnormal test data are removed. Nevertheless, due to the water loss in the process of bentonite mixing, the actual water content of compacted samples should be corrected before further use.