P-Y curve measuring device for pseudo-static test on pile-soil interaction

Abstract

The invention relates to a P-Y curve measuring device for a pseudo-static test on pile-soil interaction. The P-Y curve measuring device comprises a carrying pile body which is embedded into a test soil body in a model box, wherein a plain round bar perpendicular to the axis of the carrying pile body is connected to each test section of the carrying pile body; one end of each plain round bar is fixedly connected with the carrying pile body, and the other end of each plain round bar penetrates through the side wall of the model box and then is perpendicularly connected with a surface-smooth glass sheet; each glass sheet is perpendicularly connected with a displacement meter which is used for measuring the displacement of the carrying pile body. The P-Y curve measuring device has the beneficial effects that each plain round bar is nested in a PVC (Polyvinyl Chloride) pipe and is connected with the corresponding displacement meter on the same horizontal plane, so that interference to a measurement result caused by the soil body can be eliminated to the greatest extent; the PVC pipes are lubricated through a butter lubricant, so that the influence on the displacement of the pile body is eliminated; each plain round bar is connected with the corresponding displacement meter through the corresponding surface-smooth glass sheet, so that measurement is facilitated.

Description

technical field [0001] The invention relates to a P-Y curve measuring device for a pseudo-static test of pile-soil interaction, which belongs to the field of bridges. Background technique [0002] In the process of soft foundation treatment, the upper shallow foundation cannot meet the load requirements of buildings or structures, and pile foundations are often used. In integral abutment bridges, flexible pile foundations are often used in order to meet the expansion and contraction deformation of the bridge body. Therefore, the research on pile-soil interaction has been paid more and more attention. The pile-soil interaction problem is a problem of material nonlinearity (concrete and soil are nonlinear materials) and contact nonlinearity (the pile-soil contact surface has many different contact forms). In the past, scholars' research was limited to theoretical analysis and numerical simulation, lacking experimental verification. Field prototype test research is the most ...

AI Technical Summary

Problems solved by technology

[0005] However, in the pseudo-static model test of pile-soil interaction, the pile lateral displacement and soil reaction force obtained by this technique cannot take into account the influence of pile body bending stiffness, bending moment, pile cross-sectional shape, and pile top constraint boundary conditions. The results obtained through theoretical derivation or integration are often inconsistent with the actual results, causing great inconvenience to practical engineering applications

[0006] For pile-soil interaction pseudodynamic tests, shaking table tests and other tests involving the measurement of pile displacement, there is also the problem that the P-Y curve does not match the actual results.

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