The Theoretical Analysis And Field Test Of Pars

With the development of urban construction and technological advance,there are more and more deep foundation pit involved in engineering construction. The PARS is widely used in the bracing engineering of deep foundation pits because of its economic rationality.but its design and theoretical researches is a comparatively untested technology that has yet to be fully developed and few field tests are take place in handan.Baced on the deep foundation pit in handan the calculation model of PARS and the working state and deformation property of the structure are discussed further from the theoretical analysis, field test and numerical simulation. For theory analysis, in summing up the previous research results my opinions are put forward on the computation module of the PARS and the calculateing of earth pressure;for field test, we field tested the internal forces and displacement of the PARS in Handan and the deformation of top beam and the internal forces of piles are researched;for numerical simulation, the responding effective aspects of piles displacements are explored further. from the application of ABAQUSMaking a systematic study of the PARS with the Combination of theoretical calculations, the scene of experimental data and numerical results,the main conclusions are listed as follows:1.Through the comparative analysis of the elastic theory and classical approach, we come to the conclusion that the elastic theory is more reasonable.2.The impact of displacement should be considered during the calculation of earth pressure , the soil pressure computing formula that based on the theory of Coulomb earth pressure which consider the displacement of the piles is analyzed.this computation module is more conform to the real condition of the PARS.3.Field test showed that the top beam displacement and internal force of the piles should consider the time-space effect,and the results show some regular patterns of them alonging with the working condition,they will became smaller when the prestressed tiebacks are applied.4.It is feasible that using the ABAQUS numerical calculated method in the designing of PARS,the displacement of piles will became smaller alonging with the higher structure stiffness and great prestress.