PDF全文阅读

李小林¹ , 赵    蕊 ¹ , 宋    园²

( 1. 渭南职业技术学院 ，陕西 渭南 714000;

2. 信息产业部电子综合勘察研究院 ，陕西 西安 710054)

摘   要：公路沿线两侧堆放的大量弃土会产生一定的堆载作用，造成桥梁桩基发生变形，为避免堆载对桥梁 桩基造成无法挽回的影响，设计不均匀堆土载荷作用下桥梁桩基变形试验研究。选取合安铁路某桥梁段 58 号、59 号桥墩作为试验桩基，使用大体量钢箱作为试验箱，将两个试件置于其中并填土，使用加载装置，布置不同加载间距、不同加载等级，以及不同加载时长下，验证桥梁桩基的变形情况。经试验验证： 58 号桩基、桩顶的水平位 移、竖向位移以及变形值要略高于 59 号； 当堆积间距为 160 cm 时，两桩基的水平位移在 5 mm 之内，桩基的竖向位移均保持在-3. 0 mm, 形变值逐渐减小； 当载荷等级逐渐加大 ，达到 120 kN 时 ，58、59 号桩基的水平位移量分别达到了 25 kN、22 kN , 使桥梁桩基变形越严重，且在较大堆载作用下，桩基的竖向位移范围越大。 

关键词： 不均匀； 堆土载荷； 桥梁桩基变形； 水平位移； 沉降量； 堆载间距

中图分类号： TU473. 1      

文献标志码： A       

文章编号： 1005-8249 (2023) 04-0085-07

DOI : 10. 19860/j.cnki.issn1005-8249.2023.04.015

LI Xiaolin¹ , ZHAO Rui¹ , SONG Yuan²

( 1. Weinan Vocational & Technical College , Weinan 714000, China;

2. China Electronic Research Institute of Engineering Investigations and Design , Xi'an 710054, China)

Abstract: A large number of spoils stacked on both sides of the highway will produce a certain stacking effect, causing the deformation of bridge pile foundation. In order to avoid the irreparable impact of stacking on bridge pile foundation, an experimental study on the deformation of bridge pile foundation under uneven stacking load is proposed. The 58 and 59 piers of a bridge section of He'an railway are selected as the test pile foundation, and the large-scale steel box is used as the test box. Two test pieces are placed in it and filled with soil, and the loading device is used to verify the deformation of the bridge pile foundation under different loading spacing, loading grades and loading duration. The test shows that the horizontal displacement, vertical displacement and deformation value of No. 58 pile foundation and pile top are slightly higher than that of No. 59 pile foundation; When the stacking distance is 160cm, the horizontal displacement of the two pile foundations is within 5mm, the vertical displacement of the pile foundations is kept at -3.0mm, and the deformation value gradually decreases; When the load level gradually increases to 120kn, the horizontal displacement of pile foundation 58 and 59 reaches 25kn and 22kn respectively, which makes the deformation of bridge pile foundation more serious, and the vertical displacement range of pile foundation is larger under the action of large surcharge load.

Keywords: non-uniformity; pile load; bridge pile deformation; horizontal displacement; settlement; stack space

∗基金项目： 陕西省教育厅科研项目  (19JK0301 ) ; 渭南市科技计划项目  (2020ZD YF-SFG G-95) 。 

作者简介： 李小林  (1984—) , 女 ，硕士，讲师，研究方向： 黄土力学 、桩基工程 、支护工程研究。

收稿日期： 2022-08-04