Sensitivity Analysis of Counterweight Double-Row Pile Deformation to Weak Stratum Parameters

Abstract

For deep excavation projects with weak strata such as filled stones and mud, not only is excavation difficult, but instability and deformation problems are also prone to occur. In order to explore the sensitivity of weak strata parameters to the deformation of counterweight double-row piles, this paper takes a deep foundation pit project in Shenzhen as the research background, uses the finite element analysis software MIDAS GTS NX to conduct numerical simulation analysis of the excavation process of the foundation pit project, and compares the numerical simulation analysis results with on-site measured data. Finally, orthogonal test method and theoretical analysis method are used to analyze the sensitivity of three weak strata parameters on the deformation of counterweight double-row piles. The results show that the cohesive force C is the key influencing factor, the internal friction angle φ is an important influencing factor, and the elastic modulus E is a general influencing factor. The research results have certain engineering guidance significance for the design and construction of deep foundation pit projects in weak strata.