Study On Lateral Bearing Behavior Of Steel Socketed Piles Under Complex Geological Conditions

Based on the Chongqing Communications Science and Technology Project "after the Three Gorges reservoir water level of the overhead large deep-water pier foundation design,construction and structural NDT key technologies",respectively,through theoretical analysis,finite element numerical simulation of complex geological conditions steel casing embedded rock piles lateral bearing capacity study.The main contents and conclusions are:(1)The factors influencing the lateral bearing performance of rock-socketed piles u nder complex geological conditions are analyzed and summarized: pile diameter,rock-s ocketed depth of rock,rock strength,rock-socketed depth,Lapel width and so on.(2)By using theoretical analysis and finite element numerical simulation,the trans verse bearing capacity of rock-socketed piles with steel casing under complex geologic conditions is studied,and the finite element analysis model of the lateral bearing capacit y of steel-retaining piles is established.(3)Study on the change law of bearing capacity of rock-socketed piles with multi-layer foundation steel casing in different influencing factors.Based on the analysis of i nfluence of bearing capacity of steel retaining pile embedded in multi-layer foundation,the influence degree of each factor on bearing capacity is determined,and the changing law of lateral bearing capacity of rock-socketed pile is explored.The results show that the horizontal bearing capacity of the rock-socketed steel piles is much better than that o f the steel-free ones,and the lateral displacements of the steel-retaining piles are obviou sly reduced.Under the horizontal load,The bending moments of the main pile and the p ile increase with the load increasing,and the maximum bending moment decreases with the increase of the depth of the steel casing.The horizontal displacement of the pile hea d decreases with the increase of the rock-socketed depth of the steel casing,and the incr ease of the rock-socketed depth increases the bearing capacity of the rock-socketed pile.The horizontal displacement of the pile decreases with the increase of the depth Small,but decreasing the size of smaller.(4)Through the numerical calculation of the influence factors of the parameters of lateral bearing capacity of steel pile embedded in rock-socketed pile,the effect of variou s factors on the bearing capacity of rock-socketed rock-socketed piles in complex geolo gical conditions,Width,pile diameter,the depth of rock-socketed rock,wall thickness o f steel casing and the depth of rock-socketed steel casing.Through comparative analysisof examples,the mechanical characteristics of lateral bearing behavior of rock-sockete d piles with steel casing under complex geological conditions are explored.The stress o f the steel retaining pile and the steel casing under the horizontal load is greater.Therefo re,the steel casing has great influence on the improvement of the lateral bearing capacit y of the rock-socketed piles of the steel casing,and the role of the steel casing should be fully considered in the actual project.The width of the flange of the rock mass affects t he lateral bearing behavior of the rock-socketed piles of steel casing.The influence rang e is about twice of the pile diameter.When the width of the hem is more than twice the pile diameter,the width of the bank-The bearing capacity of rock-socketed pile is not o bvious.