Experimental Research on Settlement Monitoring of Bridge Foundation Pits Based on Fiber Optic Displacement Sensors
Taking a large bridge deep foundation pit project as an example,a fiber optic displacement sensor is used to dynamically monitor and analyze the horizontal displacement,surface settlement,anchor cable axial force,groundwater level,etc.of the crown beam and traffic lane during the foundation pit construction process.Analyze the excavation deformation law of deep foundation pits.The experimental results indicate that as the excavation of the foundation pit progresses,the crown beams and traffic lanes of the foundation pit tilt towards the direction of the foundation pit and eventually stabilize.The variation of axial force of prestressed anchor cables on the first floor of the foundation pit is basically consistent with the variation of horizontal displacement time.The trend of groundwater level changes on both sides of the foundation pit is different,but tends to stabilize in a short period of time.Throughout the entire monitoring period,the cumulative settlement values in each area of the foundation pit were within a controllable range,but the surface settlement of a building on the north side and surrounding area of the foundation pit has not yet reached stability.It is recommended to extend the settlement monitoring time in the relevant areas.
Fiber optic displacement sensorBridge foundation pitSettlement monitoring
国家科技期刊平台
NSTL
万方数据
