Study On Settlement Deformation And Monitoring Of Around Surrounding Environment Of Deep Foundation Pit

For the past few years, with the vigorous development of urban construction, thenumber of foundation pits is increased, and the excavation of the foundation pit becomesdeep, but adjacent building and underground pipes are close, so the complex problemskeep appearing with the excavation and support of foundation pit. The one oftechnological difficulties is settlement deformation around surrounding environment ofdeep foundation pit. The problems in design and monitoring are studied on the basis of areal excavation engineering.The excavation unloading and dewatering of foundation pit were numericallysimulated by establishing finite element model, and the computing result was obtainedabout settlement deformation around surrounding environment of deep foundation pit,which offers the basis for judging the impact degree of adjacent foundation pit bysettlment, and provides the precondition for deformation monitoring of foundation pit,meanwhile verifies the accuracy of support schemes of deep foundation pit undercomplicated working condition.On the basis of much monitoring data, the maximum settlement rate of monitoringpoints was regarded as study object, and the statistical analysis method was adopted toexcavate the monitoring data information, according to the pie charts expressed aspercentages and bar diagrams, the difference between monitoring data and predeterminedalarm value was obvious, the probability of settlement rate in high frequency band is low.So the alarm value of settlement rate was amended, and the2-staged forewarningmechanism was built, which was applied in practical engineering.On the base of index curve model, double-curve model and grey model, a newcombined weighting model is built by on the condition of the minimal absolute values oferrors, which has higher accuracy degree and was applied to predict the settlementdeformation around surrounding environment of deep foundation pit. By the comparisonof settlement rate predicted values and alarm value, the observations period of settlementwas determined.