A New Method For Analyzing Overturning Stability Of Gravitational Retaining Structures Of Cement Mixing Piles

Cement mixing pile gravity retaining wall is widely used in foundation pit engineering with shallow excavation due to its simple construction and low cost.In actual engineering,the cement-soil retaining wall is often subjected to overturning instability due to its unclear anti-overturning principle,complex failure mechanism,and difficulty in determining the rotating center.There are few examples of instability due to slippage.The anti-overturning stability design method in the specification fails to take into account the complexity of the wall overturning mechanism,ignoring the interaction between the retaining wall and the foundation soil,which makes the design result and the actual situation greatly different.In order to further deepen the anti-overturning stability of cement-mixed pile gravity retaining wall and study the distribution pattern of base reaction force,this paper uses indoor foundation pit excavation model test and finite element numerical simulation analysis method for cement mixing pile gravity type.The anti-overturning stability of the retaining wall and the distribution pattern of the base reaction force were studied.The main work of this paper includes the following aspects:1.This paper reviewed the research results of the anti-overturning stability analysis method of the gravity retaining wall of cement mixing piles.It is considered that the research on the anti-overturning stability of the gravity retaining wall of cement mixing piles mostly focuses on the normal use stage,and the studies on failure patterns of overturning instability are few,and the research results are still far from the actual application.2.The indoor model test based on foundation pit excavation and load action was carried out,the overturning failure mode and the base reaction force distribution pattern of the cement mixing pile gravity retaining wall were studied.The test model was designed by ourselves,and the displacement and earth pressure of the retaining wall were measured respectively,the displacement of the retaining wall and the distribution of earth pressure under different loads and loads were studied.3.The ABAQUS was used in establishing the relevant model and the numerical simulation was carried out.The distribution law of the displacement and earth pressure of the gravity retaining wall of cement mixing pile was analyzed in depth,and the results of the model test were compared and analyzed.The distribution pattern of the base reaction force and the location of the center were discussed.4.The anti-overturning stability of retaining walls is analyzed in depth by extracting the stress paths at different measuring points in different regions.The overturning failure mode of cement-soil retaining walls is determined reasonably,a practical anti-overturning stability design method is proposed and verification of the rationality of the design method was verified.