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Method for testing bearing capacity of foundation pile with dynamic stage loading method

A test method and technology of bearing capacity, applied in the test of basic structure, basic structure engineering, construction, etc., can solve the problems of urban road damage, high test risk, long test period, etc., and achieve accurate load and displacement measurement results, Accurate test results and short test period

Inactive Publication Date: 2015-11-04
安徽省(水利部淮河水利委员会)水利科学研究院(安徽省水利工程质量检测中心站) +1
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Problems solved by technology

[0005] 1. The static load test generally adopts the stacking method or the stacking anchor method, which has high detection cost, long test period, high requirements for the site, high risk of the test, and heavy-duty vehicle transportation counterweight will cause damage to urban roads

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  • Method for testing bearing capacity of foundation pile with dynamic stage loading method

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Embodiment Construction

[0021] The content of the present invention will be described below in conjunction with specific embodiments.

[0022] The method for testing the bearing capacity of foundation piles with graded application of dynamic loads according to the present invention applies graded dynamic loads to the axial direction of pile tops of foundation piles in the manner of equal potential energy increments or equal load level increments by means of graded load application hammer drop distances.

[0023] At the same time, the load, displacement, and acceleration of the pile body mass point of the foundation pile are recorded in real time. Specifically, the displacement is measured by a dynamic displacement sensor, and the dynamic load applied in stages is measured by a strain gauge or a strain sensor; the pile body mass point is impacted. The final real-time acceleration is measured by an impact acceleration sensor; the real-time recorded load and displacement data include the static and dynam...

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Abstract

The invention discloses a method for testing the bearing capacity of a foundation pile with a dynamic stage loading method. The method comprises the following steps: axially applying dynamic load to the pile top of the foundation pile in a multi-stage manner, reporting the load, displacement and acceleration caused by the mass points of the pile body of the foundation pile being impacted in real time, and then analyzing the reported load, displacement and acceleration data to judge the vertical compression bearing capacity of the foundation pile. The dynamic stage loading method adopts progressive increase of equal-potential energy or progressive increase of load magnitude. A result analysis method comprises the following steps: obtaining the relationship between static resistance deducting dynamic resistance and inertia force under the dynamic stage loading action and pile top settlement, finally synthesizing the relationship between the static resistance of the pile top under east-stage loading action and the settlement, and therefore obtaining a final comprehensive relationship chart of load and settlement; determining the maximum bearing capacity of the pile according to the change condition of loading and settlement. Compared with a static load method, the method has the advantages of being short in a test cycle and high in testing efficiency, and the testing cost is reduced; the result is closer to the effect of the actual bearing capacity of the foundation pile, the test result is more accurate, and the method is efficient.

Description

technical field [0001] The invention relates to a method for testing the bearing capacity of foundation piles with dynamic load applied in stages and analyzing the results, which belongs to the technical field of testing the vertical bearing capacity of foundation piles and single piles, and is suitable for pile body materials such as concrete pouring piles, prestressed piles, and steel piles. Higher pile vertical bearing capacity detection. Background technique [0002] In the prior art, the main method for testing the bearing capacity of foundation piles is the static load method, and another method for testing the bearing capacity of foundation piles is the "high strain method", which is a dynamic test method. The test pile is to impact the top of the pile with a heavy hammer, so that the soil around the pile is plastically deformed, and the time history curve of the pile top force and velocity is actually measured. Through the analysis of the wave theory, the test metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
Inventor 王晓泉崔德密路伟亭王林华李宝春孔昊泉朱甲龙
Owner 安徽省(水利部淮河水利委员会)水利科学研究院(安徽省水利工程质量检测中心站)
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