Application of Survey Technology in Pile Foundation Construction of Special Structural Confined Water Field

In view of the serious phenomenon of water and sand gushing during the implementation of the rotary drilling cast-in-place pile, the problem was discussed according to survey technology. The problem of water and sand gushing comes from the effect of the special structural confined water. In order to solve this problem, reverse circulation drilling technology was proposed to reduce the head pressure of underground confined water and reduce or eliminate the sand gushing at the bottom of the hole by increasing the mud specific gravity and viscosity. Then, the post-grouting process was used to deal with the mud skin effect on the side of the pile and the sediment at the end of the pile, and the measures such as increasing the diameter and length of the pile were adopted to effectively solve the technical problems. It effectively solves the technical problem that the bearing capacity and deformation may be greatly different caused by different processes in the pile foundation construction of the project, and ensures that the bearing capacity and deformation of the pile foundation meet the requirements of the design and specifications.