Geotechnical In Situ Tests

The company has standardized and modern field surveying tools which support various tests as follows:


2.1 (In Situ Tests)




2.1.1.  Standard Penetration Test, SPT                           
To find the strength and load-bearing capacity of the soil layer used in foundation design. Suitable for hard soil and sandy soil.

2.1.2.  Cone Penetration Test, CPT และ Piezocone Penetration Test, CPTu
To find the surface friction value (Sleeve Friction, FS) and the resistance at the Cone Bearing to assess soil conditions and to design foundations, end bearing piles, and shallow foundations.

2.1.3.  Field Vane Shear Test
To find the undrained shear strength of soft clay in the analysis of soil stability or “Slop Stability”.

2.1.4.  Kunzelstab
To be used for shallow foundation design or to determine the appropriate soil depth for laying the foundation.

2.1.5.  Field Density Test
In order to find the soil firmness in the field (In-Placed Density) to control the soil compaction in the field to be in compliance with the specifications of the compaction percentage.

2.1.6.  Pressuremeter Test                           
To find the soil constant level especially the pressure coefficient of the soil in order to design the lateral soil pressure.

2.1.7.  DCPT (Dynamic Cone Penetrometer Test)​
To find in-situ CBR in accordance with ASTM Standard for pavement application and design.




 2.2. Geophysical Survey Method

                2.2.1. Soil Resistivity Test
To measure difference in the electrical resistance of the soil for the Cathodic Protection design of soil structures and electrical induction in the design of the grounding systems.

                2.2.2. Thermal Conductivity Test
                To find the in-situ soil thermal conductivity range which may impact to subsoil structures such as pipelines or foundation.
2.2.3. Downhole Seismic Test
               To find the seismic wave value of the soil to be used in the design of earthquake prevention for foundations.