The Analysis On Engineering Measurement And Numerical Simulation Of The Successive Penetration Of Jacked Pile

With economy growing of China, the pace of urban development also will continue to accelerate, while people’s environmental awareness is growing. Therefore jacked pile technology for its less pollution and can make a high quality pile and high degree of automation and small shaking, and many other advantages are more widely used. In particular, it is widely used in densely populated urban areas or regions have special requirements for shock. In this paper, by theoretical analysis and engineering test data as well as element simulation platform, research and analysis of the penetrating resistance of jacked pile, time effect of pile bearing capacity and the key issues of numerical simulation, for future engineering applications and a more comprehensive analysis provides Some references. The main contents are as follows:(1) Taking full advantage of the previous study results, describes the mechanism of jacked pile and pile characteristics of different soil. Combined with the plotted curve of pile resistance measured data from engineering site of Shanghai. Law of penetrating resistance of jacked pile of Shanghai was analyzed.(2) In engineering geological investigation process, there are still many areas with single bridge static sounding test methods, so the use of specific penetration resistance value analysis to estimate the penetrating resistance of this engineering’s jacked pile is still a certain practical significance. Analysis and calculation of the actual engineering and estimated results and estimates don’t coincide with the measured results within 20 m ~ 30 m depth range and the degree of matching better within other depth.(3) The role of consolidation effect, thixotropic restoration and soil shell effect is the main factor causing jacked pile bearing capacity increase over time. This paper discussed the main factors affecting for time-effect of bearing capacity. And use of a large number of engineering measured data of when every other complex pressure test, time-effect of the bearing capacity of jacked pile distribution in different soil piles were compared, obtain bearing capacity time-effect can be divided into three stages, and time-effect is mainly manifested in the first two stages. Using FBG optical fiber sensor technology with when every other complex pressure test, test the unit side friction of pile and it demonstrates the time-effect of cohesive soil more pronounced than power soil.(4) In this paper, use the finite element analysis software ABAQUS platform, and numerical simulation analysis of jacked pile continuous penetration process from an engineering of Shanghai. By changing boundary conditions of particular step, so the idea of displacement penetration method can be realized. The constitutive model selection Mohr-Coulomb model, And balance the initial soil stress, using asymmetric solver, several attempts to mesh density, got the better convergence results. Analysis of the pile at different penetration depth radial and vertical stress and radial displacement of soil around the pile, and by the method of cross-sectional defined penetrating resistance was output then compared with the measured data.