COMPARATIVE EXPERIMENTAL RESEARCH ON DYNAMIC CONSOLIDATION METHOD FOR TREATMENT OF COLLAPSIBLE LOESS FOUNDATION

This paper investigates the collapsible loess foundation with contrast experiments on foundation treatment by dynamic consolidation. Five combination schemes are adopted and consist of different tamping energies(8000kNm, 6500kNm and 3000kNm) and different grid spacing(1.6D, 2D and 2.5D) and different bottom areas(5m2, 7m2).Before and after the experiment, a series of in-situ and laboratory tests are performed. They include standard penetration tests, static touch tests, static load tests and permeability test. Through these tests, the influence of the dynamic consolidation on the soil properties including dry density, bearing capacity, compressibility, collapsibility and permeability is analyzed. The effective depth of improvement of each project is different according to the choosing of construction technics and parameters of the dynamic consolidation. Influence of vibration caused by dynamic consolidation to adjacent buildings is analyzed, which make an example for analogic engineering construction in the future.