Pile displacement back analysis in engineering _21

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Pile displacement back analysis in engineering

0kg / m. , Cohesion c a 19kPa, friction angle of 320, the expansion angle is 300, of which the elastic modulus of soil is unknown. Known to have oil on top of the pile load 10000Pa in the settlement amount under 3mm, asked to predict the pile fabric in both under load 20000Pa settlement. Figure 2.258 geometric model of Guangxi University (Natural Science) Vol 31, IIIP-/,,,,///// drawn Figure 2 Schematic of the finite element model of Figure 3,[link widoczny dla zalogowanych], entitled simplicity, focus on counter-analysis shows , temporarily deduct the history of soil settlement. Based on experience, you'd assume that a soil modulus E. = 1E8, nonlinear analysis, and then apply the ansys optimization tool to optimize the back analysis to find a project to meet the requirements of the soil modulus. This allows the use of soil obtained by inversion of the elastic modulus were predicted in the top of the pile fabric under load 20000Pa settlement. 3.1 Calculation of the nonlinear finite element model analysis, considering the combined effect of pile-soil, pile and soil friction between the use of contacts to consider the impact of. Consider the symmetry, take 1 / 4 model to analyze the model soil size x, y, z directions, respectively, the length of the corresponding size of the pile 5 times, 3 times, 5 times. Relative to the pile of soil, the elastic modulus difference of 100 times, so specify the pile is rigid body and flexible body as a soil treatment, that is, making contact with the analysis things to pile on the surface of the rigid target surface, The target face should touch the surface of the soil surface. Finite element model as shown below. One solid element 4416, the contact of 48. Optimization Toolbox 3.2 Optimization using ansys outcome variables in Table 1, the optimal design values (units are the international standard units) calculated by the above results we can see that the third iteration to obtain the optimal solution. E === 2.83E + O8 vertical displacement when the 2.9mm, basically meet the requirements, so the soil elastic modulus E can take a 2.83E-t-08 for 20000Pa under the settlement. Figure 410000Pa firm under uniform load displacement graph 520000Pa uniform load Jian Yong Zhu supplement to the displacement: displacement back analysis method in the foundations of 2593.3 to predict the results using inversion results calculated by the above calculation results, the E of a 2.83E substituted ten 08 calculated by pile-soil: in 2O000Pa under uniform load vertical displacement shown in Figure 5.4 Conclusion geotechnical engineering is often difficult to determine the number of parameters, but the nature of rock is often from: an important role, this article through the analysis of specific examples, confirmed the displacement back analysis method is to determine the parameters of a rock in a reasonable and reliable and effective method, and can use the results of back analysis parameters for the forecast project , plays a reference for engineering practice, guidance.