Study On The Test Failure Model Of Sand Gravel Soil Pile Foundation Of Northwest Photovoltaic Support

In recent years,China has continued to develop,and more buildings have appeared on different occasions,but the space on the ground is limited.So the development of the underground spaces account for an increasing proportion.Therefore,the problem of the foundation's resistance to pull-up loads is also widespread.The uplift pile is a main form of uplift foundation.This paper has conducted a more study on the bearing characteristics of the uplifting pile under the action of uplifting resistance.The article is mainly based on the following research content:1.Explain the development history of uplift piles under uplift loads,gain a deep understanding of the practical significance of these studies,and comparatively analyze the research results in different countries and different time periods.2.Carry out full-scale field test on equal-section uplift piles,analyze the bearing characteristics of the pile.3.From the field test results,we know that:(1)Shear failure of the soil around the pile occurs,but there is no relative displacement between the pile and soil.(2)If the pull-out load increases,the shear strain occurs in the soil,and a shear limit equilibrium system is formed in the soil around the pile.So that the pile-soil displacement shear failure model is established.4.The pile-soil displacement shear failure calculation method considers more factors,which is to make the calculation more similar to the actual situation.Reduce the error of the field test measurement and theoretical calculation result,so as to prove the correctness of the theoretical analysis.5.ANSYS can establish a simplified numerical analysis model,and obtain the displacement characteristic and stress characteristic of the pile under uplift load.6.We should compare the theoretical analysis,field test and numerical simulation together.Similarly,through the test we learned the pile The anti-pulling performance and the axial force distribution of the pile body are of great help to the design and construction of the anti-pile pile.