变形协调情况下土钉墙内力和位移的计算方法

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Abstract Inner force of soil-nailing wall mainly includes axial force of nail，shear force between soil and nail，and distribution force of composite facing. The process of soil-nailing wall deformation is the process of distortion coordination and interaction of several factors among nails，composite facing and soil mass. Traditional calculation model based on moment equilibrium can not give a reasonable explanation of relationship between inner force and deformation of soil-nailing wall. Through analysis of the mechanism of force and deformation of soil-nailing wall，lateral displacement of soil mass under combination of virtual excavation stress and shear force between soil and nail by Mindlin solution is calculated，by combing with linear relationship between shear force and relative displacement with zero shear force at potential sliding plane，axial force of soil nail，shear force between soil and nail and deformation at excavation surface can be calculated. Parts beyond limited value for shear force of nail in passive area is transferred to composite facing，and its incremental force is assumed as triangle distribution. And then distribution force of composite facing is obtained according to static equilibrium. Finally，the measured data from three projects of soil-nailing wall are used to illustrate the validity of the calculation model.

Key words： excavation engineering axial force of soil-nailing interface shear force of soil-nailing force of composite facing displacement of soil-nailing wall Mindlin solution virtual excavation stress

Received: 30 August 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is1/2758

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