Pile foundation soaking load test method based on creep-strain separation

Abstract

The invention discloses a pile foundation soaking load test method based on creep-strain separation, which comprises the steps as follows: firstly, a constant load is loaded; secondly, strain values of a pile body and internal force of the pile body before the soaking are tested, that is, when the settlement of a test pile is stabilized, the strain values in different depth positions of the pile body of the test pile are tested and the internal force in different depth positions of the pile body of the test pile before the soaking are analyzed; thirdly, the soaking is conducted and the strain values of the pile body during the soaking are tested, that is, when the settlement of the test pile is stabilized, the test pile is soaked, and after the test pile is soaked, the strain values in different depth positions of the pile body of the test pile are tested at regular intervals of Delta t; fourthly, an actually measured creep degree function of a calibration section is obtained; fifthly, the creep degree function during each loading age is obtained; and sixthly, the strain values of the pile body and the internal force of the pile body are calculated after creep separation during the soaking. The method disclosed by the invention has the advantages that the steps are simple, the testing is convenient, creep and strain can be separated from a pile body strain test result simply, conveniently, rapidly and accurately, so that the test result approximates to the practical stress state of the pile body as much as possible.

Description

technical field [0001] The invention relates to a pile foundation water immersion load test method, in particular to a pile foundation water immersion load test method based on creep strain separation. Background technique [0002] In the early 1980s, Professor K. Kovari of the Department of Rock and Tunnel Engineering at the Swiss Federal University of Technology Zurich proposed the principle of linewise observation, which is different from the principle of pointwise observation represented by strain gauges; and according to Based on the principle of line method monitoring, a series of portable instruments (including sliding micrometers) have been developed to distinguish them from fixed and buried instruments such as strain gauges and multi-point extensometers. Such instruments have applied for patents and entrusted Swiss Solexperts AG to produce them Sale. [0003] The sliding micrometer is a portable high-precision strain testing instrument developed according to the pr...

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Problems solved by technology

[0008] In summary, since the pile foundation immersion load test takes a long time, under long-term loading, the concrete will not only undergo elastic strain, but also creep. However, in the previous test work, the influence of creep was ignored, and the Substituting the measured strain into the calculation formula of elastic theory to calculate the axial force of the pile body, the calculation result of the axial force of the pile body is bound to have a large error

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