|Table of Contents|

Bearing characteristics of cast-in-place piles with different hole-forming methods before and after grouting in loess area(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2021年04期
Page:
84-93
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Bearing characteristics of cast-in-place piles with different hole-forming methods before and after grouting in loess area
Author(s):
ZHOU Zhi-jun1; 2;  XU Tian-yu1; 3;  XU Fu1;  CHEN Chao-ran1;  BAI Yang1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Xi'an Changda Highway Engineering Testing Center, Chang'an University, Xi'an 710064, Shaanxi, China; 3. School of Architecture and Energy Engineering, Wenzhou University of Technology, Wenzhou 325000, Zhejiang, China)
Keywords:
bridge engineering;  cast-in-place pile;  hole-forming method;  post-grouting;  static load test;  bearing characteristic
PACS:
U443.15
DOI:
10.19818/j.cnki.1671-1637.2021.04.005
Abstract:
Static load tests on manual digging piles(MDPs), rotary drilling piles(RDPs), and impact drilling piles(IDPs)before and after grouting were performed to investigate the effect of hole-forming method on the bearing characteristics of cast-in-place piles under post-grouting. The effect of hole-forming method on the final grouting quantity was analyzed. The improvement effects of pile settlement, ultimate bearing capacity, pile side resistance, and pile end resistance before and after grouting under different hole-forming methods were evaluated. The influence mechanisms of different hole-forming methods on the grouting process and bearing characteristics of the pile were examined. The methods for calculating the ultimate bearing capacity of post-grouting pile recommended by the Technical Code for Building Pile Foundations(JGJ 94—2008)were verified by comparing different hole-forming methods and the upper return height of the slurry. Research results show that the actual final grouting quantities range from large to small in the order of RDPs, MDPs, and IDPs when the theoretical grouting quantities are the same. After grouting, the improvement effects of settlement characteristic range from positive to negative in the order of IDPs, RDPs, and MDPs. The increasing ranges of the ultimate bearing capacity are from large to small in the order of IDPs, RDPs and MDPs. The pile side resistance improves within 12 m above the pile end after grouting, and the increasing ranges are in the order of IDPs, RDPs, and MDPs. The proportions of pile end resistances to the total loads of MDPs, RDPs, and IDPs increase by 17.05%, 12.23%, and 15.10%, respectively, indicating significant improvements in the characteristics of the end-bearing friction pile. The enhanced coefficients of side resistances and end resistances of MDPs and RDPs are close to those recommended in the Technical Code for Building Pile Foundations(JGJ 94—2008), whereas those of the IDPs are slightly different. Therefore, the hole-forming method of cast-in-place pile significantly influences the selection of post-grouting parameters and the bearing characteristics of cast-in-place piles. 6 tabs, 7 figs, 31 refs.

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Last Update: 2021-09-01