Green environmental static pressed pile penetration mechanism based on FBG-MEMS joint test technology

Abstract

Green environmental static pressure pile technology has always been one of the problems that many scholars urgently need to study. For the stress test of pile-soil interface, this experiment designed the FBG-MEMS joint test technology between the pile-soil interface during the penetration of static pressure piles in cohesive soil. In this test, a model pile is set up in the model bucket. By studying what effects will happen to the pile-soil interface when the pile is in different positions in the bucket, and studying how the boundary effect affects the changes of the indoor test results, the loading device and monitoring system are used to test the pile pressing force, pile shaft axial force and pile-soil interface stress generated during the penetration of the model pile in the model box. The preliminary test verifies the characteristics of simple operation and high accuracy of the test, and also draws the conclusion that with the increase of the penetration depth, the axial force of the pile shaft and the effective lateral pressure of the pile-soil interface increase, but the lateral pressure at the same depth gradually decreases. In addition, the influence of boundary effect is further analyzed. Finally, it is concluded that the boundary effect will increase the pile driving force, pile shaft axial force and effective side friction. The research results have important reference significance for green environmental protection static pressure pile technology in practical engineering.