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Model test on bearing deformation behavior of batter piles undercombined horizontal cyclic loads and monotonic loads in sand(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2020年3期
Page:
11-21
Research Field:
道路工程
Publishing date:

Info

Title:
Model test on bearing deformation behavior of batter piles undercombined horizontal cyclic loads and monotonic loads in sand
Author(s):
CAO Weiping1; 2;  TAO Peng1;  ZHAO Min3;  LI Yuxuan1
（1. School of Civil Engineering, Xian University of Architecture and Technology, Xian 710055, Shaanxi, China;2. Key Laboratory of Geotechnical & Underground Space Engineering, Xian University of Architecture andTechnology, Xian 710055, Shaanxi, China; 3. School of Civil and Architecture Engineering,Xian Technological University, Xian 710021, Shaanxi, China）
Keywords:
road engineering;  batter pile;  model test;  horizontal bearing capacity;  cyclic load
PACS:
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DOI:
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Abstract:
In order to reveal the effect of the horizontal cyclic loads on the bearing deformation behavior of batter piles for the working condition of batter piles foundation of transmission tower subjected to wind loads, model tests were conducted to explore the bearing deformation behavior of single batter piles embedded in dry sand and two different kinds of loads were applied on the pile top, horizontal cyclic loads followed by monotonous horizontal loads and only monotonous horizontal loads. The effect of the cyclic loads on the horizontal ultimate bearing capacity, axial force, bending moment and shear force of pile was analyzed. The results show that the horizontal ultimate bearing capacity of batter piles under cyclic loads is improved, compared with batter piles only subjected to monotonous horizontal loads, and the improvement is about 10% to 14%. The entire length of the positive batter pile shaft is tensioned under horizontal load, while the upper part of the negative batter pile shaft is compressed and the remaining pile shaft is tensioned. The batter pile subjected to horizontal cyclic loads has a larger maximum axial force than that of the pile only subjected to monotonous horizontal loads. The maximum axial force of the positive batter pile is larger than that of the negative batter pile, and the position are both at about 4.5d (d is the pile diameter) from the top of the pile. Whatever positively or negatively inclined, the bending moment of the batter piles mainly appears within the length of the pile shaft about 15d below the pile top. The batter piles subjected to combined loads have nearly the same maximum bending moment with the piles only subjected to monotonous horizontal loads, and the maximum bending moment of negative batter piles are larger than that of the positive batter piles, and the former is about 1.4 times the latter. The maximum shear force of the batter piles is always at the pile top whether subjected to combined loads or only monotonous horizontal loads. There exists an extreme shear force in shaft at the position of 7.5d below the pile top. 3 tabs, 12 figs, 31 refs.

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Last Update: 2020-06-03