Monitoring and Analysis of Ultra-deep Foundation Pit of Shield Working Well
Taking the foundation pit of ultra-deep shield working well as the background of Suiguanshen Intercity Qianhai to Huanggang Port project,the monitoring of the support axial force of the enclosure structure,the surrounding surface settlement,the change of the groundwater level outside the pit,and the settlement and tilt of the surrounding buildings was carried out.The impact of construction of the ultra-deep shaft pit on the force of the enclosure structure,deformation of the stratum,and the surrounding environment was analyzed.The results show that:during the pit construction,the surface settlement was caused,and the cumulative maximum settlement reached 78.71 mm(the red warning value was 72.00 mm).The precipitation accumulation of underground water level outside the pit was normal.The cumulative settlement of the surrounding buildings reached the red warning value by 100.00％,and the maximum tilt rate was 0.47％o.The axial force monitoring of concrete support reflects that the foundation pit supporting system is in a safe state.The main targeted engineering technology and management measures taken are as follows:clearing the construction debris piled up around the pit and laying steel plates on the transport road surface to uniform the dynamic load,strengening the patrol around the pit.The soil layer is reinforced by splitting grouting.The real-time monitoring and feedback is analyzed to ensure that the monitoring data is within the controllable range.The above measures ensure the safety of the construction as a whole.
complex conditionsultra-deep foundation pitsmonitoring and analysissettlement controlsafety warnings
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