Numerical Simulation of Failure Model of Uplift Pile in Soil and Rock Foundation
Taking a high-rise building in Guizhou as an example,the mechanical properties and failure modes of pull-out pile are analyzed by field test and numerical simulation.The results show that the top displacement and ultimate bearing capacity of the pile increase with the in-crease of the length of the pile under the condition of full soil embedment and rock embedment.Under the condition of rock-socketed combina-tion,with the increase of the length of the uplift pile,the displacement of the top of the pile decreases and the ultimate bearing capacity increa-ses.When the pile length is 4 m,the top displacement of the uplift pile is 46.3 mm,and the ultimate bearing capacity is 5 153.62 kN.When the pile length is 6 m,the top displacement of the uplift pile is 12.99 mm,and the ultimate bearing capacity is 14 597.98 kN,which is 16.1%lower than that of the pile length 4 m,and 225.6%higher than that of the ultimate bearing capacity.Under the conditions of complete-ly embedded soil foundation,completely embedded rock foundation and rock-embedded composite foundation,the failure modes of uplift piles are cylindrical failure,inverted cone failure,cylindrical failure and inverted cone composite failure,respectively.
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