Back-analysis on displacement of supporting structure and proportional coefficient of horizontal resistance during foundation excavation
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Abstract:
Reasonable soil parameters directly affect the displacement and internal force calculation results of the supporting structure in foundation pit design. Especially the proportional coefficient m of horizontal resistance has the most pronounced influence on the displacement of the supporting structure. Based on an engineering case of foundation excavation, the characters of materials and process of foundation excavation were simulated by the plane finite difference method, so that the horizontal displacement of the supporting structure for the excavation was simulated and calculated. Through analysis of the influence of soil parameters on the horizontal displacement of the supporting structure, it was determined that Young's modulus was the parameter to be obtained for the back-analysis of displacement. The objective function between measured displacement and simulated displacement was built, and Young's modulus of each soil layer was obtained through back-analysis. The relationship between m value and Young's modulus was derived by the elastic foundation beam method, and thereby m value of each soil layer was obtained. The research results provided a certain theoretical basis for reasonable determination of design parameters of foundation pit, and has important practical significance for the effective control of the displacement and deformation of foundation pits.
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