Calculation of dissipation energy efficiency and experimental analysis of gravel fill under single point ramming

To study the energy dissipation efficiency of different soil types under dynamic compaction and the energy dissipation law of soil at different depths with the change of the ramming number, through theoretical derivation and analyze data such as the data of ramming settlement, vertical displacement, acceleration of rammer, continuous function time, impact of rammer and acceleration of layered soils.The analysis indicated that: the deformation of the dynamically compacted foundation soil constituted a dissipative structure, and the dissipative energy efficiency coefficient η was derived.With the increase of compaction cycles, the impact stress of the hammer on the foundation soil gradually increased, the overall compactness of the foundation soil gradually increased, and the energy dissipated for the overall reinforcement of the foundation soil gradually decreased.The greater the compaction energy, the longer the continuous action time of the hammer on the soil, and the more energy was dissipated for the overall reinforcement of the soil.With the increase of compaction cycles, the energy dissipated for the self-reinforcement of the upper soil layer of the foundation gradually decreased, then it remained stable, and finally gradually increased.The energy dissipated for the self-reinforcement of the middle soil layer gradually decreased, and then remained stable.The energy dissipated for the self-reinforcement of the lower soil layer gradually decreased, but compared with the upper and middle soil layers, the energy transmitted to the lower soil layer was smaller, the rate of increase in compactness was smaller, and the rate of reduction in energy dissipated for self-reinforcement was smaller, which had not reached a stable state.