A simplified calculation method for deformation and stress of deep foundation pit retaining structures in soil-rock composite strata

Abstract

A simplified calculation method for the deformation and stress of deep foundation pit retaining structures in soil-rock composite strata, belonging to the field of structural mechanics technology for foundation pit engineering, includes the following steps: Step 1, determining the bedrock surface morphology and the outward dipping structural surface conditions of the rock strata; Step 2, determining the lateral pressure distribution of the soil and rock mass and calculating the lateral pressure of the soil and rock mass; Step 3, calculating the soil excavation stage, the rock strata excavation stage, and the rock-embedded excavation stage; Step 4, superimposing the calculation results of the soil excavation stage, the rock strata excavation stage, and the rock-embedded excavation stage to obtain the deformation and stress and supporting axial force of the entire retaining structure after the excavation of a deep foundation pit with a shallow rock surface under soil-rock composite strata conditions. This invention simplifies the deformation and stress analysis of deep foundation pit retaining structures with a shallow rock surface, dividing the excavation stress analysis of deep foundation pits in soil-rock composite strata into segmented excavation of soil and rock layers, which is beneficial for understanding the deformation and stress law of deep foundation pit retaining structures with a shallow rock surface in soil-rock composite strata.

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