Research On The Calculation Method Of Support Structure And Parameter For Deep Foundation Pit In Soft Ground

The internal friction angle and cohesion of soil are paid more attention to by many geotechnical engineering personnel in excavation support structure calculation of soft ground, but the calculation methods of the support structure are un-properly used usually. For example, a conservative design project could lead to economic waste. However, opened design could cause engineering accident. Although many recommendations and improved schemes have been presented by the researchers and the engineering technical personnel, few of them have been put into practice.Based on a large number of engineering monitoring results, the soft soil layer, especially the soil pressure of the silt stratification, the varying displacement of the excavation support structure, and the development of internal force, has been classified systematically and analyzed to put forward the sampling method about internal friction angle and cohesive force on the predecessors' research findings. Through the further research about the designed and calculated theory, the calculated method of the stability of the fender post is presented. The method is convenient, simple and practical. The research of finite element analysis makes the excavation support structure analysis more correct and rational. The main research of the paper as follows:Firstly: Using back analysis method, the value of the internal friction angle and cohesive force values were achieved through the soil pressure value acquired on site, and generalized the regularity.Secondly: The displacement developing process and the correlation about the sample of the internal friction angle and cohesive force have been generalized through the research of the displacement character about the support system to soft ground base.Thirdly: For finding out the applicability and insufficiency of the traditional design theory, the design calculation theory was investigated by comparative analysis to found a simple calculation model, which can ensure safety and play down the...