A calibration device and method for testing the internal force of pile foundation by line measurement method

Abstract

The invention discloses a calibration device and method for testing the internal force of a pile foundation through a line testing method. The device comprises an optical fiber structure, a sliding micrometer structure and a strain gauge structure. The optical fiber structure comprises a first optical fiber, a second optical fiber and a bottom transition optical fiber, and the first optical fiberand the second optical fiber are symmetrically arranged relative to the center of a reinforcement cage; and the sliding micrometer structure comprises a micrometer pipe and a sliding micrometer. The method comprises the following steps: step 1, implanting an optical fiber; step 2, implanting a sliding micrometer pipe; step 3, performing strain gauge installation; step 4, acquiring a sliding micrometer initial value; step 5, collecting an optical fiber initial value; step 6, loading the load of a prestressed pipe pile and acquiring and processing strain data; step 7, acquiring measurement dataof the sliding micrometer; step 8, acquiring measurement data of a strain gauge; and step 9, comparing the measurement data of the sliding micrometer, the measurement data of the optical fiber and themeasurement data of the strain gauge, and acquiring the internal force of the pile foundation. According to the invention, a basis is provided for selection of pile foundation strain measurement means under different loads.

Description

technical field [0001] The invention belongs to the technical field of pile foundation internal force verification, and in particular relates to a verification device and method for testing pile foundation internal force by a line measurement method. Background technique [0002] At present, the tests used for the internal force of pile foundation can be roughly divided into two categories: point test method and line test method. The point measurement method mainly uses vibrating wire and resistance strain sensors. Generally, there are few measurement points, and it is difficult to accurately reflect the strain distribution within the pile length. The test technology of the line measurement method currently includes sliding micrometry technology and distributed optical fiber test technology. The line measurement method can obtain continuous strain along the pile body by continuously arranging test elements along the pile body. flaws in the measurement. The principle of the...

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Problems solved by technology

But so far, it is still difficult to evaluate whether the joint deformation of the test components and the pile body is good or bad, but the test accuracy of the internal force of the pile foundation using the line measurement method is difficult to be conclusive

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