– For construction projects, especially large ones such as high buildings, power plants, transmission grids, transformer stations, the resistivity value of soil is an important parameter to design earthing system, ensure safe and efficient operation …


– With teams of well-trained geotechnical engineers, many years of experience in site survey including measuring the resistivity of the ground, along with modern equipment such as the French’s brand CA6470N resistivity meter, the Japanese Kyoritsu 4106, we are committed to provide soil resistivity measurement service for design work with high reliability and reasonable cost.

Steps to perform the SPT test:

– Step 1: Drill to the test depth, cleaning & dredged muck from bottom of the borehole, and install equipment according to standards.

– Step 2: Mark 3 equal intervals (15cm) on the drliing rod.

– Step 3: Release the donut hammer in free fall and count the total number of hammers through the marked segments.

– Step 4: Take the hammer number of the last 2 segments as SPT index

– Step 5: Uninstaling SPT inquipment and remove SPT sample, repeat the steps when performing the experiment at the next times.