Single-pile vertical ultimate bearing capacity dynamic testing method based on discrete pile units

Abstract

The invention discloses a single-pile vertical ultimate bearing capacity dynamic testing method based on discrete pile units, and belongs to the field of foundation detection and testing. According tothe single-pile vertical ultimate bearing capacity dynamic testing method based on the discrete pile units, firstly, a pile body is dispersed into the plurality of pile units in the depth direction,the accelerated speed of the center position of each pile unit, the axial force of the top face and the bottom face of each pile unit and the like in the vibration process are measured correspondingly, physical quantities such as the pile body speed and displacement are obtained through integral transformation; then the moment when the dynamic displacement of each pile unit reaches the maximum (atthe moment, the dynamic damping force is zero) is selected, the static ultimate resistance of the pile side soil (or the pile end soil) borne by each pile unit at the moment is calculated; and finally the static ultimate resistance of each pile unit is accumulated to obtain the static ultimate bearing capacity of a single pile. According to the novel dynamic test analysis method, the defects of high cost, long test period and the like in a static load test can be overcome, meanwhile, the analysis of a test result is objective, the interference of human factors is small, and the result is theoretically accurate.

Description

technical field [0001] The invention belongs to the field of foundation detection and testing, and in particular relates to a dynamic testing method for the vertical ultimate bearing capacity of a single pile based on discrete pile units. Background technique [0002] Pile foundation has been widely used in various construction projects because of its excellent bearing capacity. In order to ensure that the bearing capacity of the pile foundation meets the design requirements to ensure the safety of the project, a bearing capacity test is generally required after the construction of the pile foundation is completed. In my country, the test methods commonly used in engineering to test the bearing capacity of pile foundations generally include static load tests and high-strain dynamic tests. The former is considered to be the most direct and reliable test method, and the results obtained for the vertical bearing capacity of single piles are more accurate and reliable, and are ...

AI Technical Summary

Problems solved by technology

However, this method of inversion and fitting often needs to invert hundreds of parameters. The selection and judgment of parameters have a great correlation with the experience of testers. The impact of the results is significant, and the analysis results of the same measured curve by different testers may be very different, so the reliability of the analysis results is difficult to guarantee

In addition, in order to meet the fluctuation effect, the existing high strain test is generally suitable for long piles, but not suitable for short piles where the fluctuation effect is not obvious and the influence of reflection superposition is large.

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