饱和砂土电阻率的测试方法研究

Study on the test method of saturated sand resistivity

电阻率测定土体孔隙率的方法近年来蓬勃发展,应用于工程地质、水文地质和环境监测等多个领域.文中以砂土液化过程中孔隙率变化的规律研究为背景,开展饱和砂土的电阻率定量确定方法研究.采用不同形式测试探头的对比测试试验,选择并确定适合特定形状土箱的电阻率测试探头;文中以二极和四极法为理论基础,通过选用不同类型的电极(铜片、铜丝网、细铜棒),控制电极间距、入土深度、电压等条件进行了一系列的对比试验,确定了合适的测试电极和测试方法,并探讨了上述测试条件对电阻率测试结果的影响.为开展砂土液化过程中孔隙率变化的规律研究奠定基础.

The method of measuring soil porosity by electrical resistivity has been developing vigorously in recent years;it has been applied in engineering geology , hydrogeology , environmental monitoring and other fields .This paper presents a method of quantitatively determining saturated sand porosity with electrical resistivity by porosity change law in the process of sand liquefaction .Different forms of test probes are used in comparison test trials , and electrical resistivity test probe for the specific soil box is selected and determined .Based on the theory of two-electrode and four-electrode method,a series of comparative tests are completed by changing the electrode type （ copper sheet , brass wire mesh , fine copper bar ） and controlling electrode spacing , penetration depth , voltage etc.The appropriate test electrode and the test method can be determined by these tests and the above test condi -tions affecting resistivity test results have been discussed .The foundation will be laid for investigations on the law of porosity change in the process of sand liquefaction .