The invention discloses an active prevention and
control system for sand foundation damage under the earthquake action and a construction method of the active prevention and
control system. The
system comprises a main body structure pressed into a sand stratum, earthquake frequency obtaining units annularly distributed on the periphery of the main body structure and a
power supply unit on the top. The main body structure comprises an analysis feedback unit, an
execution unit and a reinforcement unit, the analysis feedback unit receives seismic
frequency data and generates an anti-phase waveform instruction, and the
execution unit vibrates to weaken the seismic action; and under the high-strength earthquake working condition, the earthquake load effect rises, the
pore water pressure rises to the preset threshold value, the reinforcing units are triggered, the reinforcing
grout flows out of the
honeycomb grid-shaped side wall, and grouting reinforcement of the foundation is achieved. The construction method comprises the steps of site exploration, drilling operation, unit
layout, structure lowering, connection debugging and effect detection. By means of the principle of
interference reduction, through the synergistic effect of active vibration reduction and instant reinforcement, full-stage prevention and control of sand
liquefaction are achieved, the response speed is high, and the reinforcement effect can be achieved to the maximum extent.