不均匀堆土载荷作用下桥梁桩基变形试验研究  

Experimental Study on Deformation of Bridge Pile Foundation under Uneven Soil Loading

作　　者：李小林[1] 赵蕊 宋园 LI Xiaolin;ZHAO Rui;SONG Yuan(Weinan Vocational&Technical College,Weinan 714000,China;China Electronic Research Institute of Engineering Investigations and Design,Xi'an 710054,China)

机构地区：[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

出　　处：《粉煤灰综合利用》2023年第4期85-91,共7页Fly Ash Comprehensive Utilization

基　　金：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)。

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。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 No.58 and No.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 160 cm,the horizontal displacement of the two pile foundations is within 5 mm,the vertical displacement of the pile foundations is kept at-3.0 mm,and the deformation value gradually decreases;when the load level gradually increases to 120 kN,the horizontal displacement of pile foundation No.58 and No.59 reaches 25 kN and 22 kN 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.

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 

分 类 号：TU473.1[建筑科学—结构工程]