EXPERIMENTAL STUDY OF ENERGY TRANSFERRING LAW OF MUCK SOIL WITH DIFFERENT DRAINAGE SYSTEMS UNDER HIGH ENERGY IMPACT

In static-dynamic drainage consolidation method, the soil consolidation effect is strongly related to drainage body spacing. This paper studies the effect of different drainage body spacing on the energy transfer processes of soft soil under high-energy impacts. Static-dynamic consolidation model tests (1:30 similarity ratio) are performed on the muck soil where different drainage systems are installed using a self-developed high-energy electromagnetic impact testing system. The energy transferring processes in different drainage systems are characterized under repeated high-energy impacts. The experimental results show the follows. (1) The pore pressure in non-plastic drainage board(non-artificial vertical drains) area is hardly to disperse under impact load. Additional soil pressure is difficult to pass down along the depth direction. The board area can be, but the pass down needs to undergo certain impact passes. The pore pressure more easily dissipates. Larger settlement more easily takes place in the vertical drains dense area. (2) Soft soil in drain area is top-down gradually reinforced. The more dense drains, as the number of impact passes increase, the greater the proportion of the energy distribution in the deep soft ground, and the proportion becomes the largest in final impact. More obvious trend of the main compression zone moving downward is shown. Those results show that drainage setting is necessary, but should maintain a reasonable density. Under given conditions, the drains more dense, more conducive to strengthening the deep ground soil. Its important engineering significance is that the deep muck soil ground can be strengthened when impact applying sufficient number of times and with suitable drains, by using static-dynamic drainage consolidation method. The finding provides the basis for optimization of design and construction for high water content soft soil ground, and how to meet the reinforcement depth requirement as well.