Usually, the number of exploration holes is limited, and they are arranged at the midpoint between the four corners and the long side of the building's outer contour. After the foundation trench is fully excavated, the soil layer of the foundation bearing layer will be completely exposed. First, check whether the survey results are consistent with the actual situation.
Whether the conclusions and suggestions in the survey report are correct and feasible, whether the soil layer of the foundation reaches the soil layer given by the geological department when designing, and whether there is any difference. If there is any discrepancy, measures such as negotiation, modification of design scheme or foundation treatment should be taken.
Whether the foundation depth reaches the design depth, whether the bearing stratum is in place or overbreak, whether the foundation pit size is correct, the axis position and deviation, whether the foundation size meets the design requirements, whether the foundation pit is flooded and whether the basement soil layer is disturbed.
Solve the remaining problems and newly discovered problems. Sometimes, the report of the survey results left problems that could not be solved at that time. For example, when a geological prospecting unit carried out geotechnical investigation on a student dormitory, a resident was not allowed to make a hole in the courtyard, which became a legacy problem and was later solved in the inspection of the trough.