小直径盾构施工中管片纵向应力监测研究

发布时间：2018-05-19 01:39

本文选题：小直径盾构 + 隧道施工　；参考：《隧道建设(中英文)》2017年11期

【摘要】：为了探索小直径盾构法隧道在施工过程中管片纵向应力的变化规律,对北京槐房再生水厂污水隧道管片纵向应力进行了现场监测:将第976环、第1 054环管片分别设为第1和第2监测断面,2监测断面各预埋5个纵向应力计,各监测断面从本监测断面管片安装后即开始监测,当盾构掘进至第1 129环时停止监测。研究表明:1)在管片离开盾尾50环后,其纵向应力波动值小于管片拼装期间应力值的5%。2)在盾构掘进期间,管片距离盾构越远,其纵向压应力值越小。3)在管片拼装期间,管片距离盾构越远,其纵向压应力经历了先增大后减小的过程。4)管片距离盾构108环后,该管片纵向压应力趋近于0.2~0.3 MPa。5)随着盾构推进,管片纵向应力经历了4个阶段的变化过程,即周期性剧烈波动阶段—动态稳定阶段—逐渐衰减阶段—趋于稳定阶段。
[Abstract]:In order to explore the variation rule of segment longitudinal stress in small diameter shield tunneling during construction, the longitudinal stress of sewage tunnel in Beijing Huaifang Recycling Water Plant was monitored on the spot. The first and second monitoring sections are respectively set up as 5 longitudinal stress meters embedded in each monitoring section. The monitoring sections begin to monitor after the segment is installed, and stop monitoring when shield tunneling to the 1,129 rings. The results show that the longitudinal stress fluctuation value of the segment is less than 5 / 2 of the stress value during the assembly period after the segment is separated from the shield tail 50 ring.) during the shield tunneling, the longitudinal compressive stress value of the segment is smaller than that of the shield tunneling, and the longitudinal compressive stress value is smaller. 3) during the segment assembly, The longer the segment distance from shield, the more the longitudinal compressive stress of the segment increases first and then decreases. 4) after the segment distance from the shield 108 ring, the longitudinal compressive stress of the segment approaches 0.20.3MPa.5) with the shield driving, the longitudinal stress of the segment goes through four stages. That is, the period of periodic violent fluctuation, the stage of dynamic stabilization, the stage of gradual attenuation, and the stage of stabilization.
【作者单位】：中国地质大学(北京)工程技术学院;北京城建集团有限责任公司;中地华北(北京)工程技术研究院有限公司;
【分类号】：U455.43

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