Shaft Compression And Buckling Analysis For Piles Under Vertical Load

Based on the full-depth/part-depth shear spring model proposed by Luo Weide and the theoretical corealation between the pile base resistance and the pile base settlement presented by Randolph,A elastic analytical approach for computing the pile compression is conducted.The paper introduces a multiparameters static load test method. Compared with a routine test,the bottom and the top settlements can be observed by this method and multiparameters are aquired. Based on these parameters,We can get a generally analysis on the elastic-plastic compression of the pile,the side bearing and the bottom bearing as well as the properties of the soil under pile. The mothod should be generalized. With the method,the resules,calculated with this analytical approach and the numerical methods based on load transfer method,are compared with the results measured in the field test. From this,the elasticity and plasticity characteristics of the pile and the influence factors of the compression are got. Some useful conclusions are drew.In this paper,elastic resistance of soil on the side of pile is taken into account in the solution of critical load of the pile.The mechanical model for pile partly embeded in subsoil was set up,the deflection function of the pile was given according to its boundary conditions,and the expression of the total potential energy of the pile soil system was developed at first.A series of formulas for solving stablility problem were developed according to the principle of the least potential engergy,then it is solved by Galerkin method,through a series of mathematical calculations,and formulas for critical load and calculated length of high and low piles are derived.In the paper,the chart used in calculation is also given.