Subgradesettlementofbridgesuion-linemonitoringsystembasedon"benchmark-reference"formeasuringmodelforintelligentjudgmentandrecognition,usingsensortechnology,signaltransmissiontechnology,etc.,throughthedifferentpositioningsensorembeddedorembeddedsensing,subsidence,tomonitorandthesafetyofthehighrailwaybridgebasetunnelsubsidenceanddeformationofkeytechnicalindicators,recordthehistoryandexistingdata,analyzingthetrendofthefuture,themaintenancepersonnelforsubgradetunnelswithhighprecision,highreliablemeansofmonitoringandmaintenance.   Systemfeatures:   Dual-modecommunicationmode,opticalfiberandGPRS,wirelessdatareal-timetransmissiontothemonitoringcenter;   Settheupperlimitalarmcommandthroughthesoftware,andcontrolthemobilephoneSMSalarminrealtime;