基于MINDLIN解的土钉墙变形计算方法

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Abstract Lateral displacement of soil nail is a key parameter affecting its safety，however，the existed studies have not provided any reasonable theorical calculation method. A theorical calculation approach based on the MIDNLIN solution，in which virtual excavation stress is used to simulate the excavation status of soil nailing，is applied to obtain the lateral displacement of soil at potential failure surface and the end of nail caused by the virtual excavation stress and soil and nail shear stress. The approach has a hypothesis on the base of the in-situ measured data that the distribution of between soil and nail is double-triangle including two unknown coefficients，which can be worked out by two equations from the zero relative displacement and the equivalent axial force of soil nail at both sides of potential failure surface. Then the lateral displacement at the surface of soil nailing is the sum of the tension deformation of nail and the lateral deformation of soil at the end of nail. The measured data from French research test on soil nailing are used to illustrate the validity of the proposed calculation model.

Key words： soil mechanics lateral displacement MINDLIN solution virtual excavation stress soil and nail shear stress soil nailing

Received: 23 July 2010

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http://www.rockmech.org/EN/Y2011/V30/IS2/3584

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