The MSD method and its improved method(MMSD method)were modified based on the existing research and the engineering practice experience in order to further optimize the design method of foundation pit in soft soil area and improve the safety and economy of foundation pit support system.A more realistic plastic deformation mechanism was proposed based on the circular sliding mode,and the main influence depth of foundation pit excavation was introduced to quantify the size of displacement field.The method is suitable for analyzing the deformation prediction of the whole process of foundation pit excavation of multi-fulcrum flexible supporting structure in soft clay area.The calculation results of the method were compared with the measured data of six foundation pit projects in Shanghai,the calculation results of elastic fulcrum method and the calculation results of MMSD method.The parameter analysis of the maximum lateral displacement and the maximum lateral displacement depth of the retaining structure in different excavation stages was conducted.Results showed that the predicted value of the method accorded with the measured value,and the prediction accuracy was higher than that of the elastic fulcrum method and MMSD method.The practicability of this method was proved.
关键词
能量法/增量法/墙体侧移/软黏土/多支撑开挖
Key words
energy method/incremental method/wall deflection/soft clay/multi-support excavation
维普
万方数据