[1]曹卫平,陶鹏,赵敏,等.砂土中循环荷载与单调荷载组合作用下斜桩水平承载变形特性[J].长安大学学报(自然科学版),2020,40(3):11-21.
　CAO Wei ping,TAO Peng,ZHAO Min,et al.Model test on bearing deformation behavior of batter piles undercombined horizontal cyclic loads and monotonic loads in sand[J].Journal of Chang’an University (Natural Science Edition),2020,40(3):11-21.
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砂土中循环荷载与单调荷载组合作用下斜桩水平承载变形特性()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第40卷
期数:
2020年3期
页码:
11-21
栏目:
道路工程
出版日期:
2020-05-15

文章信息/Info

Title:
Model test on bearing deformation behavior of batter piles undercombined horizontal cyclic loads and monotonic loads in sand
作者:
曹卫平; 陶鹏; 赵敏; 李煜璇
（1. 西安建筑科技大学 土木工程学院,陕西 西安 710055; 2. 西安建筑科技大学 陕西省岩土与地下空间工程重点实验室,陕西 西安 710055; 3. 西安工业大学 建筑工程学院,陕西 西安 710021）
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）
关键词:
道路工程; 斜桩; 模型试验; 水平承载力; 循环荷载
Keywords:
road engineering;  batter pile;  model test;  horizontal bearing capacity;  cyclic load
文献标志码:
A
摘要:
针对斜桩基础受风荷载作用的工况，分析水平循环荷载对其承载变形特性的影响。通过室内干砂中的模型试验，研究了斜桩在经历水平循环荷载后再承受单调水平荷载时的承载变形性状，与仅在单调水平荷载作用下斜桩的性状进行了比较，分析了循环荷载幅值大小对斜桩水平极限承载力、桩身轴力、弯矩及剪力的影响。结果表明：斜桩先经历循环荷载后再承受单调水平荷载比仅受单调水平荷载作用时的水平极限承载力有一定程度的提高，提高幅度10%~14%；水平荷载作用下，正斜桩桩身全长受拉，负斜桩桩顶下一定长度区段受压，其余区段受拉；经历循环荷载后再受单调水平荷载作用比仅受单调水平荷载作用时斜桩的桩身最大轴力大，正倾斜桩的最大轴力大于负倾斜桩，两者桩身轴力最大值均在距桩顶约4.5d（d为桩径）的桩身截面；斜桩桩身的弯矩主要出现在桩顶下约15d的桩身长度范围内，经历循环荷载后再承受单调水平荷载的斜桩与仅承受单调静载时斜桩的最大弯矩基本相当，最大弯矩截面距桩顶距离均约为4.5d；负斜桩的桩身最大弯矩大于正斜桩，前者约为后者的1.4倍；经历循环荷载后再受单调水平荷载作用和仅受单调水平荷载的斜桩，其桩身最大剪力均在桩的顶部，并且在桩顶下方7.5d处存在极值剪力。
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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备注/Memo

备注/Memo:
曹卫平，陶〓鹏，赵〓敏，等.砂土中循环荷载与单调荷载组合作用下斜桩水平承载变形特性［J］.长安大学学报：自然科学版,2020,40(3):1121.CAO Weiping，TAO Peng，ZHAO Min，et al.Model test on bearing deformation behavior of batter piles under combined horizontal cyclic loads and monotonic loads in sand［J］.Journal of Changan University:Natural Science Edition,2020,40(3):1121.
更新日期/Last Update: 2020-06-03