|Table of Contents|

Bearing Behaviors of Single Pile Under Impact and Static Loads(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2019年02期
Page:
116-126
Research Field:
Publishing date:

Info

Title:
Bearing Behaviors of Single Pile Under Impact and Static Loads
Author(s):
XIONG Yu-chun;  MAO Ji-hua
(Guangzhou Construction Quality & Safety Testing Center, Guangzhou 510600, Guangdong, China)
Keywords:
impact load;  ultimate bearing capacity;  fitting analysis;  impedance;  stress wave
PACS:
TU473.1
DOI:
-
Abstract:
The high strain impact pile test and single pile axial compression static load test were carried out for cast-in-place piles, and the results of dynamic and static tests were compared and analyzed. The results show that the load-settlement curve of the static load test varies gradually, and the side resistance of pile develops earlier than tip resistance. The tip resistance shows hardening characteristics with the increase of tip displacement. The relative displacement between pile and soil required for reaching the ultimate frictional resistance is very large. With the increase of relative displacement, the frictional resistance changes as ideal elastoplastic, hyperbolic and softening model respectively. The higher the strength of pile end bearing stratum is, the more significant the negative reflection of the measured velocity signal at pile bottom of the impact test is. The lower the strength of pile end bearing stratum is, the more obvious the positive reflection of the measured velocity signal at pile bottom is. The bearing capacity of high strain fitting analysis is generally lower than that of static load test. The fitting analysis displacement of pile top is much smaller than that of static load test corresponding to the ultimate bearing capacity of single pile. The ultimate tip resistance increases with the increase of pile rock impedance ratio, and the bearing stratum has an effective impedance area. The research results have great significance in improving the calculation accuracy and reliability of the fitting analysis of soil parameters and ultimate bearing capacity of single pile.

References:

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Last Update: 2019-03-27