Trial Pit Investigation is a direct and simple method for examining subsurface soil conditions. It helps determine soil stratification, groundwater level, and suitability for foundation design.

Trial Pit Investigation is a fundamental field method used to study the subsurface soil profile by excavating small pits at the project site, typically measuring 1 m × 1 m in size and up to 3 m in depth. Collect disturbed and undisturbed soil samples for laboratory testing. It provides direct visual information about soil layers, groundwater level, and potential obstructions. This method is quick, cost-effective, and essential for shallow foundation design and preliminary geotechnical assessment, enabling engineers to plan safe and efficient construction.