Simulating device and method for groundwater seepage near coastal zone under effects of earthquake and sea tide

Abstract

The invention relates to a simulating device and a simulating method for groundwater seepage near a coastal zone under the effects of earthquake and sea tide. The device is mainly composed of a constant water head water supply device, a seepage tank, a tide generator, a salt water tank, an earthquake simulating shaking table and simulation well steel tubes, wherein the tank body can be divided into a fresh water area, a water-containing medium area and a seawater area along the length, for the water-containing medium area, water and sand are added for constructing a pressure-bearing water-containing layer, the medium of a water-resisting layer is clay, and in the salt water tank, tap water in which NaCl and carmine pigment are added is used for simulating colored seawater. According to themethod provided by the invention, the tap water is injected into the fresh water area through a constant water head and is injected into the seawater area through the tide generator; when the seawater wedge is stable, the frequency, acceleration, waveform and principal earthquake time are set on the earthquake simulating shaking table, vibration waves are loaded for starting a vibration seepage experiment, monitoring data is collected in real time, and the change process of the fresh-water-salt water interface and the water level of a pressure measuring pipe is observed. With the device and the method provided by the invention, the objective simulation and representation for the dynamic change of groundwater under the effects of earthquake waves, sea tide and the water-containing medium can be realized.

Description

technical field [0001] The invention belongs to the technical field of hydrogeology and water environment research, and relates to a simulation device and simulation method for groundwater seepage near the coast under the action of sea tides and earthquakes, and can be used for experimental teaching of groundwater seepage near the coast. Background technique [0002] An earthquake is a natural phenomenon in which vibrations are caused by the rapid release of energy from the earth's crust, during which seismic waves are generated. During the gestation and occurrence of earthquakes, the aquifers were squeezed, stretched and ruptured, resulting in abnormal responses of water levels in some wells near and far from the earthquake. The coseismic response of the groundwater level and the recovery of the water level after an earthquake are closely related to the seismic waves and the mechanical and hydraulic properties of the aquifer. [0003] Ocean tides are the periodic fluctuati...

AI Technical Summary

Problems solved by technology

At present, domestic seepage simulation experiments in near-coastal zones under tidal action are mostly used to deduce the evolution process of seawater intrusion. They only focus on analyzing the fluctuation of unconfined aquifer water level caused by the effect of tidal water pressure transfer, and cannot fully reflect the effect of tidal load on confined water. It cannot be used to identify the coseismic response characteristics of the groundwater level under the ocean tidal effect.

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