|
In recent years, with the rapid development of China's national economy , the EHV power grid , wind power , underground space , offshore engineering and other fields of development and construction in the momentum of rapid development . With the deepening of economic development and environmental pressures increasing day by day , our growth gradually shift from extensive to intensive , but also increasingly focused on the impact of construction projects on the environment . Belled pile as an economic and effective small uplift pile foundation forms , widely used in EHV transmission line foundation for environmental damage , wind turbine foundation , underground building (structure) buildings , offshore engineering uplift (floating ) designs. Extensive engineering practice with belled piles , for the ultimate uplift bearing capacity test of the load-displacement curve , the failure mechanism , numerical simulation and theoretical studies are rapid development . This article uses a large-size model test method characteristics of the uplift . And analyzes the depth of ratio of soil saturation pull the load-displacement curve of belled piles on the uplift load transfer law , the ultimate uplift bearing capacity , pile soil displacement and stress the law of development and destruction mode . Through numerical calculation method to simulate the experimental results , the simulation of large-size model test results , confirms the rationality of the model and the selected parameters . On this basis , the analysis of changes in non- saturated soil base saturation belled pile pullout pull the bearing capacity of the load-displacement curve and limit ; combined with the finite element software Seep / W analysis of rainfall , groundwater level changes Unsaturated of belled pile uplift soil uplift bearing capacity of the load-displacement curve and limit . Final calculation formula , the use of numerical methods based on experience belled pile uplift ultimate bearing capacity chart can be used for hand calculations , the calculation of the test results , mostly scholars , confirm the availability of this formula .
|