Comparisons of GD10 and AGI ERT Electrical Instrument Measurements

Last update time : 03/07/2018

Author : zhang jie

1. Objectives

Compare the performance of the GD10 electrical system and the AGI ERT electrical instrument. Detect the distribution range of the landslide body in the working area, the layer of the landslide body, the saturated zone inside the landslide body and the distribution and the buried depth of the aquifer.

2.Test method

The work is used for the comparison of the testing performance and accuracy between the GD-10 and the AGI electrical instrument. A measuring line is laid along the landslide site. The Wenner α, Schlumberger and Dipole-dipole arrays are selected for the test. The electrode spacing is 5m and the total number is 36. Before measurement, an electrode grounding resistance detection is conducted firstly and the data acquisition is started after all the grounding resistances are normal.

3. Data processing and conclusion

A measuring line is laid for the ERT resistivity comparison test. The EarthImager 2D inversion software of the AGI is applied for data processing. The comparison is as follows.

Wenner α comparative inversion (a) GD10 electrical system (b) AGI ERT electrical instrument

Schlumberger Refutation Graph (a) GD10 electrical system (b) AGI ERT electrical instrument

Dipole-dipole comparative inversion (a) GD10 electrical system (b) AGI ERT electrical instrument

It can be concluded from the inversion results that the measurement points of the Dipole-dipole scripts of the GD10 electrical instrument are added and the analyses of the deep data are deepened. With the optimization of the small signal data points, in the context of the same overall length and resolution of the measurement, the GD10 can detect about 20m deeper than the AGI.

Meanwhile, from the inversion result images, it can be known that the GD10 and the AGI can both obviously reflect the stratified structure of the strata, the characteristics of the high and low resistivity are evident and the results are basically consistent. Due to dry weather and limited rainfall, the upper loess of the Heifangtai are dry all the time and the natural moisture content is less than 10% generally. Therefore, it can be concluded from the inversion result image that about 1-9m section of the upper part is in middle or high impedance. For example, the red area in the image are inferred as the Aeolian deposit loess, the main components are silt grains, the properties of soils are homogeneous and the soils have loose and porous structures, the soils have a high salt content and comply with the geological environment of the area.

The GD10 electrical instrument is available for viewing test data, scatter diagrams, fitting pictures, voltage-current curves, variance etc. The real-time data quality can be estimated on site and at the same time the accuracy can be improved with the method of automatic iteration .

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Last update time 03/07/2018

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