Research On The Bearing Capacity Behavior Of Pile Foundation Under Horizonal Loading

The stress and deformation characteristics of pile foundation under horizontal loading or earthquakes have always been a difficult point in the engineering.The calculation method are mainly the method under the action of inertial load and the method of the interaction of pile and soil.It is found in practice that there are few research work on the internal force distribution characteristics of large scale pile group foundation under horizontal load and the coefficient of the horizontal bearing capacity of large scale pile group foundation.The calculation of pile-soil interaction is too cumbersome and not suitable for engineering applications.Therefore,in order to solve the above problems,some numerical calculation,theoretical derivation and numerical verification of shaking table test have done in this paper.The following main research works had been carried out,and corresponding research conclusions had been achieved.1.The characteristics of large scale group pile foundation under horizontal load were analyzed in detail.The analysis of the parameters of soil was carried out,and the quantitative relationship between elastic modulus and m value was established.Several groups of pile group foundation finite element models were established,and the internal forces distribution of pile foundation in pile group foundation is obtained.The coefficient of the horizontal bearing capacity of pile group was analyzed.A formula for calculating the horizontal bearing capacity of large scale group piles was presented at last.2.A theoretical deduction was made for the interaction of the pile and soil movement caused by the inertial simple harmonic load on the top of the pile And the corresponding calculation program was compiled to verify.The influence of pile soil stiffness ratio and vibration frequency was discussed.The interaction between pile and soil caused by bedrock movement was theoretically derived.The deformation and internal force behaviour of pile were calculated through an example.3.The numerical model of pile-soil-structure-interaction was established in this paper,and it is verified by the results of a large scale shaking table model test.Some conclusions similar to those obtained from experiments were obtained.And supplementary analysis was made for the work that has not been done experimentally.Finally,the distribution of pile internal force and the distribution characteristics of pile soil contact pressure were obtained.