Research on Application of Fiber Bragg Grating Seepage Pressure Sensor in Soil Test

Combined with the pressure-sensitive characteristics of corrugated diaphragm and the strain sensing characteristics of fiber Bragg grating (FBG), a kind of FBG sensor is developed to measure the seepage pressure change of soil in a small range. By carrying out the soil seepage flow monitoring test and the laboratory slope model test, and comparing the theoretical and measured values of these tests, it can be found that it is feasible to apply FBG seepage pressure sensor to the seepage pressure monitoring of soil mass. The sensor can guarantee the validity and reliability of data in the medium- or long-term monitoring process and shows superior performance compared with conventional seepage pressure sensor. The FBG seepage pressure sensor has the characteristics of high sensitivity, stable long-term performance, high precision, and strong real-time performance. It provides a new measurement method for the seepage pressure monitoring of soil mass within the range of 0–100 kPa.