Development of OF based intelligent geotextile and its case study in high-speed railway subgrade

Geotextile is one of the important reinforcement materials for high-speed railway subgrade, and its service performance is closely related to subgrade safety. In order to grasp the mechanical properties of geotextile, the OF (optical fiber) based intelligent geotextile by braiding FRP (fiber reinforced polymer) packaged OF sensor into geotextile is developed, and applied for the settlement monitoring of karst cave expansion process in one sub -grade model and one high-speed railway subgrade construction. The test and field monitoring data show that the strain data measured by the optical fiber sensor is basically consistent with that measured by the settlement plate which indicates that the developed intelligent geotextile not only has good reinforcement function, but also has good sensing function.