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利用地震模拟振动台和自行设计的刚性渗流模型箱,模拟渗流条件下振动对井-承压含水层系统水位的影响过程.通过输入12组不同的振动频率和振动加速度的正弦波及1组模拟EL Centro波,探察水位与不同输入频率和加速度的振动响应关系,并同步观测含水层井水位变化过程中对应响应加速度、孔隙压力的变化特征.结果表明:测压水位的变化形态与输入振动的频率有关,并且与孔隙压力的变化一致,输入低频(0.5、1、2 Hz)时,孔隙压力振荡下降,测压水位呈阶降变化;输入高频(5、10、15 Hz)时,孔隙压力振荡上升,测压水位以阶升变化为主,验证了测压水位的变化主要是振动引起含水层孔隙压的变化导致的.本次实验可为今后开展此类实验提供一般的研究思路和技术经验,并为进一步探究含水层形变-孔隙压-水位之间的定量关系传递机理提供基础数据支持.
The seismic simulation shaking table and self-designed rigid seepage model box are used to simulate the influence of the vibration on the water table of well-bearing aquifer system under the seepage condition.Through inputting 12 groups of sine wave with different vibration frequency and vibration acceleration and 1 set of simulation EL Centro wave was used to investigate the relationship between water level and vibration response of different input frequencies and accelerations and to observe the corresponding changes of response acceleration and pore pressure during the change of well water level in aquifer.The results show that the variation of pressure water level and the frequency of input vibration , And the change of pore pressure is consistent. When low frequency (0.5, 1, 2 Hz) is input, the pore pressure oscillation declines and the water pressure level changes stepwise. When high frequency (5,10,15 Hz) is input, pore pressure The oscillation rose and the water pressure level changed mainly by step change, which verified that the change of water pressure level was mainly caused by the change of pore pressure caused by vibration in aquifer.This experiment can provide general research ideas and techniques for future experiments Experience and provide basic data support for further exploration of the mechanism of quantitative relationship between aquifer deformation-pore pressure-water level.