Underground cavity monitoring and road collapse accident early warning system and method

The invention discloses an underground cavity monitoring and road collapse accident early warning system and method. The system comprises a flexible strain sensor array, a signal processing pile and a monitoring end, wherein the flexible strain sensor array comprises a plurality of strain sensor units arranged along a linear path; the sensor unit is composed of a flexible substrate, a conductive fluid layer and a top protection layer, the top protection layer and the bottom flexible substrate are both made of high-elasticity Ecoflex materials, and the conductive fluid layer is a conductive channel which is formed by filling a substrate micro-channel structure with ink conductive fluid and has a special shape. The device can be applied to urban road underground cavity monitoring and road collapse accident early warning, is low in manufacturing cost, simple and convenient in preparation process, simple in signal detection mode and good in monitoring effect, and can meet the engineering requirements of collapse