Combined supporting system of the slope protection pile and the compound soil nail wall with micro steel pipe piles

Abstract:

This article proposes a new combined supporting system—the slope protection pile and the compound soil nail wall with micro steel pipe piles， which successfully solved the technical difficulties such as necessity of vertical excavation around the foundation pit due to no grading space， great depth of the foundation pit， requirement for small displacement， and high support costs. In addition， the system provided convenient construction， and was beneficial to control of the displacement and deformation of the slope， and enhancement of the overall stability of the slope without impact on the surrounding environment during the excavation of the foundation pit. The design and construction with this support method was tested for a project in Beijing， and the monitoring results were good with great improvement in the safety and stability of the slope； thus， verifying the feasibility of the support form. It has technical and economic advantages that conventional soil nail walls and slope protection piles cannot compare to in deep foundation pit support. It can be used as a reference for other similar projects， and has high application and promotion value.