Research on Monitoring and Analysis of Anchorage Foundation and Evaluation of Stability for Suspension Bridge
Based on the Cangrong Xunjiang Bridge project,based on the principles of the least squares method and control charts,the left and right control limits of the monitoring positions are fitted,and the monitored values are compared with with the left and right control limits,so as to realize judgement and warning issue of the settlement and horizontal displacement of the bridge anchor pit and the safety and stability of the anchor pile foundation.According to the comparison between the monitoring values and the left and right control limits,it is found that the maximum horizontal displacement monitoring value at a depth of 5 m for the PI2 pile foundation is 24.99 mm,which meets the design specification requirements.However,some horizontal displacement monitoring values still exceed the left and right control limits,indicating several abnormal points.The maximum deviation between the monitoring values and the fitted values is 0.94 mm.The cause of the data anomaly is attributed to the presence of sediment on the pile body during construction or excessive rainfall infiltrating underground during the construction period,leading to abnormal groundwater levels.It is recommended to strengthen monitoring of the PI2 pile foundation and reinforce the abnormal areas.The settlement and horizontal displacement of the anchor pit surface and the horizontal displacement of the remaining pile foundations are within the left and right control limits,indicating within a safe and controllable range.The maximum settlement value of the anchor pit is 3.3 mm,which is less than the design value of 5 mm.The maximum horizontal displacement of the anchor pit is 6.93 mm,which meets the design requirements.However,the standard deviation of the horizontal displacement deviation for DB4 in the North 1 anchorage foundation is 0.17 mm,which is significantly larger than the other three sets of data in the North 1 anchorage foundation.The reason for the large standard deviation is due to the slower construction progress in the pit area where DB4 is located.Therefore,it is recommended to appropriately speed up the progress in the pit area where DB 4 is located.
bridge engineeringCangrong Xunjiang Bridgeanchorage foundationsafety stabilitymonitoring and analysis
万方数据
维普
