摘要
增补桩基加固是目前重载铁路扩能改造中墩台基础常用的加固方法,而如何选择科学合理的增补桩数量和长度则是加固前的首要工作。以朔黄铁路磁河特大桥浅基桥墩加固为工程背景,采用有限元软件模拟和现场施工监测相结合的技术手段,开展增补桩数量和长度对桥梁横向振幅的影响研究。结果表明:当增补桩数量为12根时,梁跨中横向振幅与墩顶横向振幅抑制比增长最为明显,分别为10.5%和13.2%;增补桩长度越大桥跨结构振动越小。当增补桩长度为24 m时,对跨中横向振幅的抑制比最大为34.6%,对墩顶横向振幅的抑制比达到44.5%,但当增补桩长度超过24 m时,加固对桥梁结构横向振幅的抑制比增长趋势变缓,24 m桩长是最优增补桩长度。
Using supplementary piles to strengthen the pile foundation for piers is the most widely used reinforcing method for the capacity-expanding transformation of heavy-haul railways.However,the right choice of the number and the length of supplementary piles is the primary job that has to be done before the consolidating construction.With the consolidating construction for the shallow-foundation piers of the Cihe River Mega Bridge as the engineering background,a study is made in the present paper of the effect of the number and length of supplementary piles on the transverse amplitude of the bridge by means of the finite element analysis software in combination with the monitoring of the site construction.The result of our research shows that the inhibition ratio of the transverse amplitude at the middle of the beam and the transverse amplitude at the top of the pier increases most obviously when the number of the supplementary piles is 12,which are respectively10.5%and 13.2%.The greater the length of the supplementary pile,the less the vibration of the bridge structure.When the length of the supplementary pile is 24 m,the maximum inhibition ratio to the mid-span transverse amplitude is 34.6%,and the maximum inhibition ratio to the transverse amplitude of the pier top is 44.5%.However,when the length of supplementary pile exceeds 24 m,the inhibition ratio to the transverse amplitude of the bridge structure increases more slowly,and thus,the optimal length of the supplementary pile is 24 m.
作者
李峰帜
LI Fengzhi(The Shuohuang Railway Development Co.Ltd.,Suning 062350,China)
出处
《国防交通工程与技术》
2020年第4期54-58,共5页
Traffic Engineering and Technology for National Defence
关键词
重载铁路
增补桩
数值模拟
现场试验
横向振幅
heavy-haul railway
supplementary pile
numerical simulation
field test
transverse amplitude
