Experimental research on geological fissure monitoring based on distributed piezoelectric sensing technology

Abstract

The causes of geological fissures are complex, and the disaster situation is very serious, and it is very difficult to carry out early warning and monitoring. To this end, a new type of Sensor-enabled piezoelectric geocables (SPGC) is used for geological fissure monitoring, which has piezoelectric effect and impedance-strain effect. Model tests were carried out to study the accuracy of fixed-point SPGC to determine the location of geological cracks, and the characteristics of soil internal deformation were analyzed based on SPGC monitoring data, so as to achieve early warning effect. The test results show that SPGC can accurately locate the crack location compared with the traditional point sensor, and the shorter the segmentation, the more accurate the identification of the crack location. The faster the soil collapse rate, the smaller the crack volume, the smaller the normalized impedance of SPGC, and the smaller the soil strain change. The voltage generated by the vibration of SPGC can react significantly to the internal collapse of the soil. The results show that SPGC can realize the catastrophic location and precursor identification of ground fissures.