摘要
以青岛地铁君峰路-西流庄区间隧道为依托工程,运用有限差分软件FLAC3D建立隧道开挖模型,研究地铁隧道开挖时爆破强度过程中路基的位移变化,并分析其沉降槽参数的变化规律。以弥补钻爆法地铁隧道施工对路基的影响目前研究较少的不足。研究结果表明:随着振速峰值在1.0~2.2 cm/s增加,路基沉降不断增长;振速峰值达到2.0 cm/s后,初始开挖面处的路基竖向位移出现上浮;随着振速峰值的增大,路基竖向位移斜率不断增大,且斜率的增长速度加快;钻爆法地铁隧道开挖过程中,路基沉降曲线符合Peck公式。通过研究得到振速峰值在1.0~2.2 cm/s时,路基沉降值最大值Smax计算公式。随着振速的变化,沉降槽宽度i的变化规律并不明显。
The study on roadbed under drill-blasting tunnel excavation is not enough now.Based on the interval tunnel Junfeng Road-Xiliuzhuang section of Qingdao railway,the FLAC3D software was used to build the model of tunnel excavation.Roadbed settlement was computed with the impact of blasting strength during drill-blasting excavation.And the regulation of the settlement tank parameters was analyzed.The results show that the subgrade settlement increases gradually with the increase of the peak vibration speed in the range of 1.0~2.2 cm/s.When the peak vibration speed reaching 2.0 cm/s,the vertical displacement of the road foundation at the initial excavation surface appears to float.With the increase of the peak vibration speed,the vertical displacement slope of the road foundation increases continuously,and the slope grows faster.During the excavation of subway tunnel by blasting,the subgrade settlement curve conforms to the Peck formula.Smax formula of subgrade is obtained when the peak vibration speed is in the range of 1.0~2.2 cm/s.With the change of the vibration speed,the variation of i in peck formula is not obvious.
作者
于咏妍
王稷良
万飞
付重滔
YU Yong-yan;WANG Ji-liang;WAN Fei;FU Zhong-tao(Research Institute of Highway Ministry of Transport, Beijing 100088, China;First Engineering Co. , Ltd. China Railway 16th Bureau Group Co. , Ltd. , Beijing 101300, China)
出处
《科学技术与工程》
北大核心
2020年第12期4931-4938,共8页
Science Technology and Engineering
基金
中央级公益性科研院所基本科研业务费专项(2018-9009)
柳州市科技计划项目(2018BK10503)。
关键词
地铁隧道
公路路基沉降
钻爆强度
数值模拟
沉降槽
subway tunnel
highway subgrade settlement
drill-blasting strength
numerical simulation
settlement tank
