Study On Treatment And Evaluation Of Super-Large Area Of Silt Sand Foundation In The Yellow River Floodplain

General Secretary Xi Jinping proposed a major national strategy for ecological protection and high-quality development in the Yellow River Basin,clarified that the Yellow River Basin has an important strategic position in my country’s poverty alleviation and economic and social development,and emphasized that the Yellow River Basin is an important area to win the battle against poverty.In order to change the current situation of impoverishment due to floods in the Yellow River floodplain in Dongming,China Communications Construction Group CCCC No.4 Public Office actively responded to the national order to hold the Yellow River Dongming Demolition and Resettlement Project.Building houses on the beach for the residents of the beach area.In order to solve the problems of high water content and low bearing capacity of the silty sand foundation with blowing and filling,this paper relies on the research project of the construction technology of filling silt foundation treatment in the Yellow River floodplain to carry out research on this.In the construction process of super-large area silt sand foundation,in order to ensure the stability of the superstructure,it is necessary to have a good foundation bearing capacity,but the silt sand foundation with high water content,low soil bearing capacity,difficult treatment and no Experience and other factors make it difficult to guarantee the construction quality.Therefore,it is of great engineering significance to study the treatment and evaluation of super-large silt-filled sand foundations in the Yellow River floodplain.In this paper,based on the actual engineering of well point dewatering combined with dynamic compaction to reinforce blow-filled silt foundation,the experimental research is carried out mainly on field tests.At the same time,combined with numerical simulation and HYPERBOLA model prediction method,the mechanism of this method to strengthen silt foundation is comprehensively analyzed.,The reasonable range of design parameters and the treatment effect provide the basis for the theoretical research of the method and the optimal design of the scheme.The main contents and conclusions of this paper are as follows:(1)Aiming at the ambiguity of the key parameters of traditional dynamic compaction and well point dewatering construction in the design stage,the drainage effect and consolidation effect under different construction parameters were simulated based on ABAQUS software,and it was found that the silt foundation under the action of different compaction parameters was effective.The stress-strain response law was optimized,and the design parameters of dynamic compaction were optimized.(2)The surface wave method was used to investigate the uniformity and ramming effect of the treated foundation,the Rayleigh wave velocity and the regression equation of the in-situ test foundation bearing capacity were fitted,and the foundation bearing capacity model of the silty sand foundation was established.Based on the Rayleigh wave response law of soil under dynamic compaction,the fitting function of the number of ramming strikes and the effective reinforcement depth is obtained.(3)In view of the problems of poor integrity,low efficiency,and large errors in the traditional monitoring scheme,a large-area,all-round rapid monitoring system based on the UAV-assisted precision level has been established,which has improved the settlement monitoring of the super-large-area silty sand foundation platform.efficiency.After long-term and large-scale settlement monitoring,the overall settlement curve of the village platform tends to be stable.(4)The construction parameters of dynamic compaction and well point dewatering are optimized through numerical simulation,and non-destructive surface wave detection is carried out.Measurement and long-term settlement monitoring,with reference to traditional construction techniques,have formed a complete set of construction methods for super-large area silty sand foundation platform including blowing and filling technology and foundation treatment technology.