|Table of Contents|

Flexural Mechanical Properties of Grouted Micro-steel-pipe-piles(PDF)

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

Issue:
2020年04期
Page:
87-96
Research Field:
Publishing date:

Info

Title:
Flexural Mechanical Properties of Grouted Micro-steel-pipe-piles
Author(s):
XIAO Cheng-zhi1;  SI Yu1;  WANG Zi-han1;  LI Li-shu2
(1. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China; 2. Department of Administration of Chengde Road Engineering, Chengde 067000, Hebei, China)
Keywords:
micro-steel-pipe-pile;  grouting;  flexural ultimate load;  steel pipe;  flexural test
PACS:
TU311
DOI:
10.19815/j.jace.2019.11028
Abstract:
On the basis of flexural loading test for 15 micro-steel-pipe-piles, the effect of diameter d and wall thickness t of steel pipe, water cement ratio of slurry, diameter r and spacing s of steel pipe surface grouting holes on the flexural bearing capacity, deformation and failure properties of micro-steel-pipe-piles were comprehensively analyzed. The results show that with the same diameter of pile body, the diameter and wall thickness of the steel pipe have a significant influence on the flexural bearing capacity of the micro-steel-pipe-piles. With the increase of the diameter and wall thickness of steel pipe, the ultimate flexural load of micro-piles increases approximately linearly. When 0.59≤d/D≤0.72(D is pile diameter), the water cement ratio of the slurry changes between 0.45 and 0.75, the influence on the ultimate flexural load of the pile is small, and the influence of hole arrangement on the ultimate flexural load of piles is small. Based on the analysis of the load-strain curves of the grouted micro-steel-pipe pile and the surrounding slurry, the standard of the flexural failure of the piles is based on the damage of the surrounding slurry. When 0.28≤d/D<0.59, the flexural loads corresponding to steel pipe yielding and outside slurry cracking almost equal to the ultimate flexural load. When 0.59≤d/D≤0.72, the steel pipe at midspan begins to yield when the applied load is about 80% of the ultimate load, and the micro-steel-pipe-piles exhibit well extensible performance. The strengths of steel pipes and slurry inside pipes have been utilized fully and they can play main role against flexural performance of micro-piles. It is suggested that 0.59≤d/D≤0.72 should be used in the design of micro-steel-pipe-pile.

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Last Update: 2020-07-29