简易照相法在膨胀土收缩试验中的应用

Application of Simple Photographic Method to the Expansive Soil shrinkage Test

为了验证简易照相法在膨胀土收缩试验中应用的可行性,在试验时用简易照相法进行土样直径的测量,同时采用游标卡尺法做对比试验。对两种方法测得的试验结果进行分析,发现简易照相法相对于游标卡尺法存在一差值。研究发现,土样高度是引起这一差值的主要原因。由实验数据可以看到,当把土样高度引起的误差消除之后,修正后的简易照相法计算的直径值能更好地遵循膨胀土收缩试验的规律。简易照相法作为一种非接触测量方法,能避免测量过程中对土样的损伤,处理数据方便,有一定的实际应用意义。

In order to verify the feasibility of the application of simple photographic method（SPM）to the expansive soil shrinkage test,the diameter of soil sample is measured by simple photographic method,while vernier caliper method（VCM）is used to do the comparison tests.The result showed a difference in tests between with simple photographic method to the vernier caliper method.It is found that the soil sample height is the main reason causing the difference..Through experimental analysis,when the error caused by soil sample height is eliminated,we achieved the modified simple photographic method to calculate the diameter value can better follow the law of expansive soil shrinkage test..As a non-contact measurement method,simple photographic method can avoid damage to soil samples,and is easy to handle data,so the simple photographic method has a certain practical significance.