Model Test of Stress and Displacement of Recyclable Anchor Rod Support Structure

Abstract

A recyclable bolt is a kind of green supporting component that can save materials and weaken the influence of underground engineering. It has a good application prospect in foundation pit and slope-supporting engineering, as well as a high economic and environmental effect in future engineering construction. The stress and displacement change of the foundation pit with a recoverable bolt was analyzed by performing a laboratory model test. The test results demonstrated that in the process of excavation, the recyclable anchor rod supporting the structure effectively limited the horizontal displacement of the pile top and had a significant constraint effect on the surface settlement. With the increase in the excavation depth, both the axial force value of the recyclable anchor rod and the maximum bending moment value of the supporting pile increased gradually, and the maximum bending moment value of the supporting pile appeared at 1/3 H. After the excavation, the maximum horizontal displacement of the pile top was 0.04% of the excavation depth. The failure recovery of the anchor was the primary factor contributing to the increased deformation of the foundation pit during the backfilling stage. Upon completion of the backfilling process, the final deformation of the foundation pit reached 0.1% of the excavation depth; this can meet safety requirements, reduce the waste of building materials, and conform to the concept of green sustainable development.

Keywords

• foundation pit excavation
• foundation pit backfill
• recyclable anchor rod
• model test
• stress and displacement