Method for analyzing bearing capacity of foundation pile by joint inversion of multiple hammering signals

An analysis method and a joint inversion technology, applied in infrastructure testing, infrastructure engineering, construction, etc., can solve the problems of low signal-to-noise ratio of reflected wave response, increase the length of analysis time period, and different geometric parameters, etc., to achieve improved Analyzing accuracy, solving uncertainty and low accuracy, and reducing the effect of model error

Active Publication Date: 2019-01-04
WUHAN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

However, the geometric parameters of the actual pile length are different, and the weight and height of the drop hammer are also different. It is difficult to divide the time intervals of pile-soil interaction loading, sliding, and unloading. In addition, the signal-to-noise ratio of the follow-up reflected wave response at the bottom of the pile is

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  • Method for analyzing bearing capacity of foundation pile by joint inversion of multiple hammering signals
  • Method for analyzing bearing capacity of foundation pile by joint inversion of multiple hammering signals
  • Method for analyzing bearing capacity of foundation pile by joint inversion of multiple hammering signals

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[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0027] A block diagram of an analysis method for combined inversion of foundation pile bearing capacity by multiple hammer signals, as shown in figure 1 shown, including the following steps:

[0028] Step S1, at different heights above the top of the foundation pile, hammer the top of the pile with a heavy hammer multiple times, and obtain the measured force curve of the installation end face and the mass point of the installation end face at each hammering Speed ​​measurement curve;

[0029] Step S2, according to the signal collection time interval, the test length from the installation end face position to the pile bottom, and the average wave velocity of the wave within the test length, divide the foundation pil...

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Abstract

The invention relates to a method for analyzing the bearing capacity of a foundation pile by joint inversion of multiple hammering signals. The method for analyzing the bearing capacity of the foundation pile by the joint inversion of the multiple hammering signals comprises the steps that a heavy hammer is lifted from low to high to different heights, strain and acceleration response signals produced by different times of hammer impact are recorded by strain rings and accelerometers on the two symmetric sides under a pile tip, and the measured impact force and the measured particle velocity of different times of hammering are obtained from the measured signals of the positions of measure points; the particle velocity theoretical values of the corresponding hammering times are calculated from the measured forces of different times of hammering and the preset parameters of a pile-soil interaction model; the objective function related to pile-soil parameters is established by the difference value between the measured and theoretical calculating values of the particle velocity of different times of hammering; and model parameters are adjusted, and when the difference value of the previous and subsequent step objective function is less than the preset error, the calculation value of the ultimate bearing capacity and other parameters of the pile-soil interaction model are obtained.According to the method for analyzing the bearing capacity of the foundation pile by the joint inversion of the multiple hammering signals, hammer tests at different heights of the foundation pile arecarried out, the amount of data for inversion analysis is increased, the sensitivity of the optimized objective function to the variation of pile-soil interaction parameters is improved, and the uncertainty of solution in the inversion analysis is reduced.

Description

technical field [0001] The invention relates to the field of foundation foundations, in particular to testing and analysis of foundation single pile bearing capacity, and is applicable to road bridges, civil and industrial buildings, docks, power plants and other single pile foundation projects. Background technique [0002] The ultimate bearing capacity test of foundation piles is very important to the safety of foundation engineering. Commonly used tests include load method, heap load method and self-balancing method. Although these methods have intuitive results and high precision, they are time-consuming, costly and complicated to operate. The high-strain dynamic measurement method is a method for testing the bearing capacity of foundation piles developed in the 1960s. However, the uniqueness and accuracy of the solution of this method are affected by the following factors. (1) Test factors: the uneven force on the pile top section caused by the position deviation of th...

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Application Information

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IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 柴华友
Owner WUHAN INSTITUTE OF TECHNOLOGY
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