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| RESEARCH AND APPLICATION OF CALCULATION METHODS FOR REBOUND DEFORMATION OF FOUNDATION PITS |
| LI Dening1，2，LOU Xiaoming1，2，YANG Min1，2 |
| (1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；2. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China) |
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Abstract The rebound deformation of foundation pits has significant influence on their stability. Nowadays，there are several calculation methods for rebound deformation，such as traditional method，empirical formula，residual stress method and so on. But there were always obvious errors between calculation results and measured values. According to the residual stress equal to the weight of removed soil，the larger unloading stress can be modified by residual stress. The corresponding rebound modulus can be gotten through the ordinary compression tests or empirical formulas. A new practical calculation method for rebound deformation was proposed. The conception of the method is easier to be understood and to be put into effect. The rebound deformation at any depth below the ground surface can be calculated by the method. By comparing the calculating results to the measured values，the method was proved to be feasible and advanced. It is of great significance to improve the design theories of foundation pits.
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Received: 22 March 2012
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2012, Vol. 31 
