Research on the Application of Reduction Factor Method of Shear Strength for the Soil Nailing Wall in Deep Foundation Pit

摘要

Although the support structure of soil nailing wall in deep foundation pit has been universally applied and developed for its economical cost, quality reliability and quick construction, there are still some problems in its design because of the uncertainty of soil parameters in the slope stability analysis of soil nailing wall in deep foundation pit. In the paper, a theory called as the reduction factor method of shear strength was put forward, and the distributing characteristics of stress field and displacement filed during excavation and support were analyzed combined with tri-dimension dynamic simulation of FLAC3D. So that the integrated strength parameters after excavation and support were determined and used in order to calculate the safety factor of foundation pit slope. This method can be a reference for effective analysis of the soil nailing wall in deep foundation pit.