Analysis method of driveability of large-diameter and super-long pipe piles based on cptu test
An analysis method and a large-diameter technology, applied in the field of marine engineering, can solve the problems of differences in the properties of single-layer marine soils and failure to consider dynamic soil resistance, etc., and achieve the effect of easy calculation, easy determination of parameters and reliable parameters
Inactive Publication Date: 2021-06-04
TIANJIN UNIV
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Problems solved by technology
The disadvantage is that the dynamic soil resistance is not considered in the calculation process, and the pile side friction and pile tip resistance of a single soil layer do not change, and there are still differences in the properties of the actual single-layer marine soil.
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[0037] In order to understand the invention content, features and effects of the present invention, the following examples are exemplified, and the present invention is further described in conjunction with the accompanying drawings.
[0038] The method for analyzing the driveability of large-diameter super-long pipe piles based on the CPTU test of the present invention specifically includes the following steps:
[0039] Step 1. Obtain the initial cone tip resistance q' of the probe through the CPTU in-situ test c , side friction resistance f s and the pore water pressure u. When conducting the CPTU in-situ test, the instrument and equipment used is the Wison-APB pile hole CPTU system of the survey center. The cone angle of the CPTU probe is 60°, and the area of the cone head is 10cm 2 , the friction sleeve area is 150cm 2 , the pore pressure sensor is installed 5mm above the shoulder of the probe cone tip, the continuous penetration stroke of each test is 3m, and the pen...
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The invention discloses a method for analyzing the driveability of large-diameter super-long pipe piles based on the CPTU test: the initial cone tip resistance and pore water pressure of the probe are obtained through the CPTU test, and the initial cone tip resistance is corrected; foundation design; determine the variation curve of the unit hammering energy with depth of the pile foundation; calculate the ratio E / q c ; draw different soil layers E / q c Variation diagram with depth, and fitting E / q c The relational expression varies with depth; the hammering energy per unit of depth corresponding to the site is obtained through the resistance of the cone tip, and divided by the click energy to obtain the predicted number of hammerings at this depth. Based on the CPTU test results, the present invention analyzes the driveability of large-diameter and super-long pipe piles by establishing a relational expression of the unit hammering energy and the ratio of the corrected cone tip resistance with depth.
Description
technical field [0001] The present invention relates to ocean engineering, and more specifically relates to a method for analyzing the driveability of large-diameter and super-long pipe piles based on CPTU testing. Background technique [0002] With the continuous development of marine engineering to the deep sea, large-diameter and super-long open steel pipe piles have been widely used, and the pile installation project is facing greater difficulties and challenges. Pile driveability analysis is a key part of installation engineering. At present, the accuracy of the driveability analysis of large-diameter super-long piles is an important guarantee for the smooth progress of piling construction. In actual engineering, sometimes due to mistakes in the judgment of the driveability of piles, or failure to drive piles to the designed depth , and cause accidents such as pile cutting and pile head damage; sometimes the depth of the pile has exceeded the design depth of the pile, ...
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IPC IPC(8): G06F30/13G06F119/14
CPCG06F30/13G06F2119/06
Inventor 李飒尹蒋松贾志远
Owner TIANJIN UNIV