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李小林¹ , 趙    蕊 ¹ , 宋    園²

( 1. 渭南職業技術學院 ，陜西 渭南 714000;

2. 信息產業部電子綜合勘察研究院 ，陜西 西安 710054)

摘   要：公路沿線兩側堆放的大量棄土會產生一定的堆載作用，造成橋梁樁基發生變形，為避免堆載對橋梁 樁基造成無法挽回的影響，設計不均勻堆土載荷作用下橋梁樁基變形試驗研究。選取合安鐵路某橋梁段 58 號、59 號橋墩作為試驗樁基，使用大體量鋼箱作為試驗箱，將兩個試件置于其中并填土，使用加載裝置，布置不同加載間距、不同加載等級，以及不同加載時長下，驗證橋梁樁基的變形情況。經試驗驗證： 58 號樁基、樁頂的水平位 移、豎向位移以及變形值要略高于 59 號； 當堆積間距為 160 cm 時，兩樁基的水平位移在 5 mm 之內，樁基的豎向位移均保持在-3. 0 mm, 形變值逐漸減小； 當載荷等級逐漸加大 ，達到 120 kN 時 ，58、59 號樁基的水平位移量分別達到了 25 kN、22 kN , 使橋梁樁基變形越嚴重，且在較大堆載作用下，樁基的豎向位移范圍越大。 

關鍵詞： 不均勻； 堆土載荷； 橋梁樁基變形； 水平位移； 沉降量； 堆載間距

中圖分類號： TU473. 1      

文獻標志碼： A       

文章編號： 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

?基金項目： 陜西省教育廳科研項目  (19JK0301 ) ; 渭南市科技計劃項目  (2020ZD YF-SFG G-95) 。 

作者簡介： 李小林  (1984—) , 女 ，碩士，講師，研究方向： 黃土力學 、樁基工程 、支護工程研究。

收稿日期： 2022-08-04