Study On Settlement After Construction Of Soft Soil Foundation Treated By Surcharge Preloading Method Of Drainage Board In East Runway Of Chengdu New Airport

With the advancement of western development,china's western region's infrastructure is well underway,the chengdu new airport as one of the important supporting projects has play a very important role in improving the traffic situation,and chengdu new airport is located in the southwest hilly area,The terrain changes heavily,uneven distribution of soft soil and developmed widely,since the soft soil has characteristics of high water content and easy to compress,if they are not caused attention in construction process,the settlement or uneven settlement of airport pavement is large after construction is completed,which will influence the normal operation of the airport.Therefore,this paper conducts proper foundation treatment on the basis of studying the characteristics of soft soil in the test area,and at the same time pays attention to the quality of filling construction during the process from filling to elevation of road surface,which has certain guiding significance for reducing postconstruction settlement of airport road surface.Based on the study of geological survey data of chengdu new airport,this paper takes the thickness and nature of soft soil as the main research factors to conduct foundation treatment.At the same time,filling and stacking construction are carried out according to the actual geological situation,and then the change regularity of foundation settlement is analyzed after foundation treatment.The main methods and contents are as follows:(1)First of all,a small test area in the study area is established,and several different methods are selected for ground treatment according to the different thickness of soft soil foundation characteristics,and then after filling and stacking construction are completed,analyzing the change regularity of the original foundation and the filling body by calculating the monitoring data,thus the results of foundation treatment in the test area are obtained.;(2)On the basis of the soft soil foundation treatment results in the test area,proper methods are selected for foundation treatment in the whole field according to the actual geological conditions.In this study,we are mainly calculating and analyzing the area are treated by drain of the east runway,and the average degree of consolidation and residual settlement of the soft soil foundation at the end of the preloading period are calculated by theoretical methods.(3)Based on the monitoring data,the monitoring data of the original foundation and the filling body in the east runway drainage plate treatment area is predicted according to the calculation method used in the test area,and the settlement amount and non-uniform settlement rate in the 30 years after construction are calculated and corrected;(4)A geological model is established for the typical foundation profile in the drainage slab treatment area and numerical calculations are performed using Geostudio,and the settlement of soft soil original foundation and filling body are getted when filling and stowaging at differenth heights,then simulating calculation the settlement of soft soil original foundation and filling body within 30 years after airport pavement construction is completed.Finally,the technical key points of controlling the post-construction settlement and non-uniform settlement rate of airport pavement are analyzed and discussed..