doi:10.16186/j.cnki.1673-9787.2020.1.19

Received:2019/05/15

Revised:2019/08/17

Published:2020/01/15

Comparative study of laboratory test of bearing behavior of open-endand close-end pipe piles based on clayey soil

ZHANG Mingyi1,2, GUAN Jinping1, WANG Yonghong1,2, LIU Junwei1,2, SANG Songkui1, MIAO Dezi1

1.School of Civil Engineering， Qingdao University of Technology， Qingdao  266033， Shandong， China;2.Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone， Qingdao  266033 ， Shandong， China

Abstract:In order to more deeply study the influence of different pile end forms on the bearing behaviors of piles， the bearing behavior of open-end and close-end pipe piles in cohesive soils were studied by laboratory model comparison tests. The results showed that the Q-s curves of test piles T1 and T2 were steeply descending. The pile top settlement of the two test piles was large， the maximum settlement was 47. 72 mm and 43. 24 mm， respectively. And the compressive ultimate bearing capacity of single pile was 6. 3 kN and 7. 3 kN ， respectively. The axial force of the inner pile of the test pile T1 was gradually reduced with the depth of the soil within the height range of the soil plug. The axial force of the pile T1 and T2 outer tube piles decreased with the increase of depth. The axial force of the test pile T2 outer tube pile body was larger than the axial force of the test pile T1 outer tube pile body from 24. 2% to 102. 7% . The lateral friction of the inner tube of the test pile T1 gradually increased with the increase of the buried depth within the height range of the soil plug. When the load was small， the outer tube side frictional resistance increased first and then decreased， which always showed an increasing trend when the pile top load reached the maximum. Under the load of all levels， the pile end resistance sharing ratio of the two test piles was between 53. 5% and 72. 3% , and the pile end resistance always played a major role， and the pile end resistance sharing ratio of the open pile was smaller than that of the closed pile. The research results of the comparative tests had important reference significance for the selection of pile types in actual engineering.

Key words:open-end pipe pile;close-end pipe pile;clayey ground;bearing behavior

基于黏性土的开闭口管桩承载性状室内试验对比研究_张明义.pdf