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How to select points for subgrade elastic modulus test
1, equidistant sampling method: divide the test section evenly into several equidistant measuring points. It is usually suggested to divide the road section into one measuring point every meter or half meter to obtain more detailed deformation data.

2. Equal area sampling method: divide the test section into several equal area areas according to the area size, and set a measuring point in the center of each area. This method can ensure the uniform distribution of deformation data in the whole test area.

3. Irregular point selection method: according to the specific road conditions and test requirements, select some key positions to set measuring points. These key parts may be weak parts of pavement structure, parts with special design requirements or parts with abnormal deformation. By measuring points at these key positions, the pavement performance can be evaluated more accurately.

4. No matter which method is adopted, it is necessary to ensure that the position of the measuring point can represent the deformation of the whole test section. At the same time, during the test, the measuring points should be arranged according to the test specifications and standards to ensure the accuracy and stability of the measuring equipment.