Model Test And Numerical Simulation Of H-Type Retaining Structure

At present,slope engineering in mountainous cities has become a hot topic in geotechnical engineering.Among them,one of the most critical technologies involved is the slope support technology.However,as the scale of underground excavation projects continues to increase,the limitations of conventional anti-slide piles have begun to appear.Especially for some slopes with large heights,conventional anti-slide piles have problems such as weak bending resistance,large pile top displacement,and high cost.Therefore,how to improve the conventional anti-slide pile structure in order to improve the applicability has become an urgent problem to be solved.Existing engineering practice has proved that compared with conventional supporting structures,the h-shaped retaining structure not only has great advantages in bending rigidity,but also reduces the amount of structure layout,reduces the project cost,and can strictly control the pile top Displacement,reducing the impact on the surrounding environment.However,there is still a lack of research on the properties and failure modes of the h-shaped retaining structure,which greatly limits the popularization and application of the h-shaped retaining structure.This article explored this aspectFirst of all,based on the form of the h-type retaining structure and a certain proportion,a physical model test was designed to study the influence of main geometric design factors of the distance between front and rear pile and the length of the front pile on the behavior of the h-type retaining structure.Displacement gauges,strain gauges and earth pressure cells were arranged on the pile top and pile body to collect the pile top displacement,pile body strain and earth pressure change data of the h-type retaining structure during the entire excavation process,and the analysis of the data revealed the influence of two factors of the distance between front and rear pile and the length of the front pile on of the pile top displacement,pile body bending moment and earth pressure distribution of the retaining structure.In addition,advanced digital camera measurement software was used to analyze the deformation of the soil during the excavation process,and summarized that the failure mode of the slope under the support of the h-type retaining structure is mainly divided into "V" and "W".Secondly,the numerical analysis software Optum G2 was used to simulate the model test,which verified and complemented each other with the test results.The numerical simulation and the model test have a high degree of consistency,and the research results can be used as a reference for actual engineering.Thirdly,based on the actual situation,a typical calculation model was established,and the influence of geometric parameters and soil parameters on the failure mode and stability safety factor of the slope were studied by using the finite element strength reduction method,and a simplified calculation method for stability safety factor of the slope was given,which can effectively evaluate the stability of the slope.Finally,it summarized the main content of this article.At the same time,it also pointed out the limitations of this article and put forward suggestions for improvement in future research work.In addition,a simplified calculation method for the safety factor of slope stability was also provided.