Borehole Survey in Tajikistan

Last update time : 01/09/2018

Author : zhang jie

The Use of Electrical Resistivity application on Borehole survey in Tajikistan

The researchers use ground resistivity equipment to establish salinization boundaries. This is also to determine the range of electrical conductivity in the riverside area. In this survey, the researchers focused on determining the salinity of the soil in the site using electrical resistivity equipment with borehole application.

  1. Test site background description:

Due to the local climate change and the overly extreme salinity of the soil, the vegetation in the entire upper and lower reaches of the river is scarce. This not only to serious water and to soil erosion in the river, but mainly the soft soil surrounding it. Additions to the soft soil there are steel materials used in the construction before the layout, in the plane surrounded by reinforced and related materials made of solid soft clay construction work.  The specific layout of the form is generally horizontal.   Researchers have borehole equipment to use in the survey area.

Project implementation purposes

1.) Understand the stratum structure below the whole plane, to facilitate the selection of relevant mining equipment and work plan formulation in the later stage.

Clearly identify the specific location of the rock layer cracks predicted by the experts, and provide more reference data for the repair works.

Analysis of the results

There are sand and gravel in the site, overall there is a high electrical resistivity stratigraphy in the area. Because of the surface water and rain it is estimated that the surface layer is relatively low resistivity. If there is water infiltration in the cracks, it will lead to low resistance rate. This is to find the rock plate and the ground crack.

Line AC section surface 0 to 1 meter low resistivity layer value of 1 ~ 5 ohm. Extending from the surface to a depth of 15 meters, the local deep as 24 meters. The local high resistivity value of 24.5 meters at section depth is 16 ohms . Line BD section of the surface 0 to 14 meters for the low resistivity layer, section depth of 15.5 meters at high resistivity. Line BC section of the surface 0 to 11 meters for the low resistivity layer, section depth of 16 meters at high resistivity . Line survey AD section surface 0 ~ 15.5 meters for the low resistivity layer section depth of 24 meters high resistivity. The measured CD section surface 0 to 9 meters is the low resistivity layer section depth of 14 meters high resistivity. Line AB section depth of 11 meters at high resistivity.

According to the surveyed profile, it is found that the low resistivity layer of 0 to 1 m in the surface layer is 1 to 5 ohms. Which is caused by surface water infiltration, and the low resistivity of 1 m in-depth is caused by water fractures. In which the local high resistivity 16 ohms the AT A depth of 15 m the WAS ASSUMED to the BE A Disk. Of of The Overall Line A → D / B → D / C → D shows that the low resistivity around C well and D well are both low. The trend of low resistivity is that C and D wells extend to A and B, Under the extension.The line A → D / B → C can confirm that the middle part of the well is a low resistivity block, which may be the temporary aquifer caused by the temporary aquifer or the fractures.

Real map

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Last update time 01/09/2018

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