摘要
为了研究深埋条件下曲线钢顶管接触压力分布和变化规律,以拱北隧道曲线顶管管幕工程为背景,通过对曲线顶管施工现场监测的接触压力进行分析.结果表明:顶进力随顶进距离的增加基本呈线性增长,且中粗砂地层单位面积摩阻力大于砂质黏性土地层;接触压力顶进时发生波动并增大,顶进停止后逐渐趋于平稳,在浮力和顶进力侧向分力作用下,管道顶部和底部的接触压力数值较为接近,且顶部接触压力略大于底部压力,水平位置管道弯曲内侧接触压力小于弯曲外侧;附加接触压力随着掘进面与监测断面距离减小而增加,机头穿过监测断面后,已顶管道水平位置附加接触压力减小,而顶部接触压力由于土拱效应反而持续增长.
In order to study distribution and change laws of pipe contact pressure during steel curved pipe jacking under larger buried depth condition,the contact pressure of curved pipe jacking were monitored and analyzed by a site test,based on Gongbei curved pipe jacking roof tunnel project.The results show that jacking force approximately rises with increase of jacking distance and friction resistance of unit area in coarse sand is greater than that of sand clayey soil.The contact pressure fluctuates and increases during jacking process,but gradually restores stability after jacking stoppage.With effect of buoyancy and lateral jacking force,the contact pressure values at top and bottom of pipe are relatively close,but the upper pressure is slightly larger than the bottom pressure.The horizontal contact pressure inside of pipe is less than that in the bending of outside.The additional contact pressure is increasing as distance decreases between excavation face and monitoring section.The horizontal additional contact pressure of previous jacked pipe reduces and the top contact pressure instead continues to grow due to soil arching effect after jacking machine head through the monitoring section.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第5期93-97,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
交通运输部建设科技项目(2013318J11300)
关键词
曲线钢顶管
接触压力
拱北隧道
顶进力
现场监测
curved pipe jacking
contact pressure
Gongbei tunnel
jacking force
site monitoring
