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湿陷性黄土场地风电基桩水平承载特性试验研究
谢 龙1 , 赵 野2 , 薛 奇1 , 张豫川2 , 王恒涛1 , 姚永国2
摘 要

(1 大唐定边风力发电有限责任公司, 榆林 719000; 2 兰州大学土木工程系, 兰州 730000)

摘要: 为探究黄土湿陷性对风电基桩水平承载特性的影响,在陕西省定边县某黄土场地设置 3 根试桩进行水平载荷试验,其中 1 根桩周土保持天然状态,2 根桩周土在加载前已经浸水饱和且湿陷稳定。 分析了各级水平荷载作用下两类试桩桩顶水平位移、桩身弯矩及其分布范围、水平抗力系数的比例系数 m 值的差异。 试验结果表明:桩周土饱和湿陷明显增大了桩的水平位移,随着水平荷载增加这种现象更为显著;桩周土饱和湿陷时的桩身弯矩大小及其分布范围均比桩周土天然状态时大;幂函数能够较好地反映不同桩顶水平位移与 m 值之间关系,可以通过建立幂函数以获取 m 值及其相应单桩在地面处水平位移的对应关系。

关键词: 黄土; 饱和湿陷; 风电基桩; 水平荷载试验; 水平位移; 桩身弯矩; m 值

中图分类号:TU198 文献标志码:A 文章编号:1002⁃848X(2022)14⁃0141⁃05

 

DOI:10􀆰 19701 / j􀆰 jzjg􀆰 20200818

 

Experimental study on horizontal bearing capacity of wind power foundation piles incollapsible loess site

XIE Long1, ZHAO Ye2, XUE Qi1, ZHANG Yuchuan2, WANG Hengtao1, YAO Yongguo2

(1 Datang Dingbian Wind Power Generation Co. , Ltd. , Yulin 719000, China; 2 Department of Civil Engineering,Lanzhou University, Lanzhou 730000, China)

Abstract: In order to explore the effect of loess collapsibility on the horizontal bearing characteristics of wind powerfoundation piles, three test piles were set up in a loess site in Dingbian County, Shaanxi Province for horizontal load tests.Among them, the surrounding soil of 1 pile remains in its natural state, and the surrounding soil of 2 piles has beensaturated with water and has stable collapsibility before loading. The differences of the horizontal displacement of the piletop, the bending moment of the pile body and its distribution range, and the scaling factor for horizontal resistance factor mvalue of the two types of test piles under the action of horizontal loads at all levels were analyzed. The test results show thatthe saturated collapsibility of the soil around the pile significantly increases the horizontal displacement of the pile, and thisphenomenon is more significant with the increase of the horizontal load. The magnitude and distribution range of thebending moment of the pile body when the soil around the pile is saturated and collapsible are larger than those when thesoil around the pile is in the natural state. The power function can better reflect the relationship between the horizontal displacement of pile tops and the m value, and the corresponding relationship between the m value and the horizontaldisplacement of the corresponding single pile on the ground can be obtained by establishing a power function.

Keywords: loess; saturation collapsibility; wind power foundation pile; horizontal load test; horizontal displacement;bending moment of pile body;m value

第一作者:谢龙,硕士,高级工程师,主要从事地基基础方面研究,Email:1729400334@ qq. com。
通信作者:张豫川,硕士,教授,主要从事地基基础方面研究,Email: zhangshch@ lzu. edu. cn。
 
[引用本文] 谢龙, 赵野, 薛奇,等. 湿陷性黄土场地风电基桩水平承载特性试验研究[ J]. 建筑结构,2022,52(14):141⁃145. XIE Long, ZHAO Ye, XUE Qi, et al. Experimental study on horizontal bearing capacity of wind powerfoundation piles in collapsible loess site[J]. Building Structure,2022,52(14):141⁃145.
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