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为研究砂土物理性质随时间变化特性,开展了饱和砂土孔隙率变化的电阻率特性研究。研制了二电极交流电法电阻率测试设备,分析通电时间、接触电阻等影响因素验证设备的可靠性;开展孔隙水不同电阻率、砂土不同饱和度和孔隙率情况下砂土的电阻率特性研究,着重探讨了饱和砂土不同孔隙率的电阻率特性。结果表明:采用该设备测试土体电阻率时,通电历史的影响可以忽略,电极与土体间的接触电阻与土体的饱和度有关;饱和砂土电阻率与其孔隙率具有十分明显的幂函数关系;并通过极差和信噪比参数分析了砂土中孔隙水的电阻率、饱和度和孔隙率对砂土电阻率的影响程度。
In order to study the time-varying characteristics of sand physical properties, resistivity characteristics of the saturated sand porosity were studied. Developed a two-electrode AC resistivity test equipment, analysis of power time, contact resistance and other influencing factors to verify the reliability of the device; to carry out pore water resistivity, sand saturation and porosity under different resistivity characteristics of sand , Focusing on the resistivity of saturated sand with different porosity. The results show that when this device is used to test the resistivity of the soil, the influence of the electricity history can be neglected. The contact resistance between the electrode and the soil is related to the saturation of the soil. The resistivity of the saturated sand and its porosity have a very significant power function The influence of resistivity, saturation and porosity of pore water in sand on the resistivity of sand was analyzed by the range and SNR parameters.