Soil Pressure Measuring Pipe Based on BOTDR

At present, the vibrating wire soil pressure gauge and the resistance-type soil pressure gauge are widely used. However, there are some disadvantages, such as high cost, poor anti electromagnetic interference and low survival rate of the instrument. Moreover, the test data are easy to be distorted and it is difficult to accurately measure the soil pressure. Based on BOTDR, a soil pressure pipe for soil pressure monitoring is designed. The structural characteristics and measuring principle of the soil pressure pipe are introduced, and its pressure and temperature calibration tests are carried out. In the outdoor field, the pressure pipe is buried 25 m underground by the method of drilling directly, and the field measurement is carried out to obtain the data. The comparison with the data of vibrating wire soil pressure gauge and the calculated value shows that the method is effective.