| With the continuous development of China's economic construction,our country's infrastructure construction is in a period of vigorous development. Therefore,it results in a large number of foundations with complex environments.Because of the advantages of high capacity,low cost,simple construction and seismic performance,rock-socketed pile used in building such as high,heavy,large-scale problem,and has been widely applied in port project,and has made tremendous economic and social effects.First of all,the author discussion deeply on work characteristics of rock-socketed pile in the vertical and horizontal loads,anglicizing the laws of load transfer and deformation,summed up the whole process of pile-soil lateral resistance,rock pile side resistance,tip resistance,and obtained the form of possible damage and influencing factors.For mechanical characteristics of rock-socketed pile,introduced respectively the calculations of Vertical and horizontal loads at this stage,at the same time made stress analysis of methods-vertical bearing capacity of the fixed rock-socketed depth which is compared to the minimum depth in horizontal loads.For the theoretical analysis results,piles used in the Phase III of the Cuntan were conducted a field test in situ tests and laboratory model to analyze actual stress and deformation,the play and the process of change for pile side resistance of soil and rock side of the pile resistance and tip resistance.On this basis,the test S2# pile is regarded as the research object,used yield and failure criteria of rock and soil in realistic engineering,in order to establish the corresponding three-dimensional numerical model of pile-rock-soil interaction.As a result,Pile bearing capacity is acquired and the reliability of the model is demonstrated.In addition,this article established three-dimensional model by finite element analysis software ANSYS,analysis the influencing factors in the piles bearing capacity,such as the non-socketed segment covered soil,the depth of embedded rock,rock strength,aspect ratio,pile diameter.That is got the main factors for the bearing capacity of piles in each of the three parts;the depth and the bedrock strength of rock-socketed remained the most important.Anglicizing the influencing factors of the bearing capacity analysis,in the use of performance proposed that aspect ratio should be 15~20,overlying soil should be considered strong and thick,rock-socketed depth should also be distinguished according to the nature of the rock,and depth of soft rock socketed which should be recommended value for the(3~5)D,do not exist the greatest rock-socketed depth.Studied the traits of the rock-socketed pile from theoretical,analyzed the affecting factors of bearing capacity,mainly including pile strength and foundation strength.On the basis of practical engineering situ piles in the field tests and model test carried out the numerical simulation,and put forward a number of improved performance measures,which has a certain significance for the rock-socketed pile's design,construction and management. |
