深埋曲线钢顶管受力特性现场监测试验研究

发布时间：2018-04-13 19:11

本文选题：曲线钢顶管 + 管幕　；参考：《岩土工程学报》2016年10期

【摘要】：为了研究深埋曲线钢顶管施工过程中的力学特性,依托拱北隧道曲线顶管管幕工程,对曲线顶管管节轴向与环向应变进行了现场监测分析。实测数据结果表明,管节应变随顶进距离增大而略微增加,但基本保持在一定范围内。管节在顶进过程中应力曲线发生波动,停止顶进后逐渐趋于平稳。管节轴向应力主要受顶进力影响,而环向应力主要取决管节外侧环向荷载,曲线顶管管节弯曲内侧存在压应力集中。由于存在泊松效应,大埋深条件下管节顶部和底部轴向应力受环向变形控制。随着与机头距离增加,管节由轴向两侧受压逐渐转变为单侧受压,受压区位于管节弯曲内侧,应力集中更加显著。
[Abstract]:In order to study the mechanical characteristics during the construction of deep buried curved steel pipe jacking, the axial and circumferential strain of curved pipe jacking nodes in Arch North Tunnel were monitored and analyzed on the spot, relying on the curved top pipe curtain engineering of arch north tunnel.The measured results show that the joint strain increases slightly with the increase of the jacking distance, but it is kept in a certain range.The stress curve fluctuates during the jacking process and tends to be stable after stopping the jacking.The axial stress of the pipe is mainly affected by the jacking force, while the circumferential stress is mainly determined by the circumferential load on the outer side of the pipe, and the pressure stress is concentrated on the inside of the bending of the curved pipe jacking.Due to the Poisson effect, the axial stress at the top and bottom of the pipe joints is controlled by circumferential deformation under the condition of large buried depth.With the increase of the distance from the nozzles to the nozzles, the compression of the joints gradually changes from axial to unilateral compression, and the compression zone is located on the inner side of the joints, and the stress concentration is more obvious.
【作者单位】：中国地质大学(武汉)工程学院;
【基金】：交通运输部项目(港珠澳大桥海连接线拱北隧道建设关键技术与应用研究-201331 J11300)
【分类号】：TU990.3

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