Research On The Mechanism Of Dynamic Compaction And Comprehensive Testing Technology Of Bearing Capacity Of Backfill Foundation

The scarcity of construction land has now become a common problem faced by people.The mountainous and hilly areas have large space,but the steep slope is not suitable for the needs of daily construction life.If the gullies are filled up,the compaction of the soil in the backfill area is far from meeting the needs of construction.Refer to a large number of literature to expound the foundation reinforcement method,and introduce the development course and future development direction of dynamic compaction method;Based on vibration wave theory,dynamic consolidation principle,dynamic displacement principle and dynamic compaction principle,the reinforcement theory of dynamic compaction method is analyzed.The design parameters of dynamic compaction are introduced.The dynamic compaction design is carried out through practical engineering,and the design parameters are adjusted according to the test results of dynamic compaction.The engineering application of dynamic compaction method is ahead of the theoretical research.Therefore,the design theory and construction technology method of dynamic compaction method are both semi-theoretical and semi-empirical state at present,and the detection of bearing capacity after construction is completed is very important.The reinforcement effect of dynamic compaction was evaluated by plate load test,heavy dynamic penetration test and Rayleigh wave test.The three kinds of tests are combined in pairs to study the correlation and verify it.The Rayleigh wave test results are intuitionized,and a number of connected one-dimensional profiles are stitched together to form a two-dimensional matrix.After the two-dimensional matrix is interpolated and smoothed,the two-dimensional profiles are drawn with SURFER.The numerical simulation software ABAQUS was used to analyze the change of single click weight with time,the change of cumulative weight with the number of ramming,and the distribution of principal stress on soil with time,and the related law of the distribution of dynamic consolidation process which originally finished quickly and was difficult to observe was studied.