摘要
水平定向转回拖过程是工程建设中的重难点,为优化施工方案,采用工程实例为研究对象,根据管道下穿的不同曲率半径建立了基于S型平面路径的水平定向钻管道回拖过程的有限元模型,获得最佳曲率半径的施工方案,并分析了管道回拖过程中的应力、应变、轴力分布规律。结果显示,在进入2-3弯曲段时,管道与导向孔产生较大的侧向接触力,应力应变增大明显,最大径向拉应力为163.8 MPa,轴力呈现先迅速增大而后缓慢增大的趋势;当管道穿越2-3弯曲段后,管道与导向孔之间的接触力迅速减小,管道处于悬浮状态,局部与导向孔接触稍大,应力应变值基本趋于稳定,且回拖力呈现缓慢增加的趋势,局部呈现阶梯式增加的现象;根据仿真模型最终计算,获得管道轴力最大值为10846 kN,与实际回拖力为12033 kN相比,拟合偏差仅为9.9%,计算结果与实际较为吻合,最后提出净浮力控制措施,为类似工程施工提供借鉴。
Horizontal directional retracement process is a major difficult point in engineering construction,in order to optimize the construction scheme,the engineering example is used as the research object,according to the different curvature radii of the pipeline under the pipeline,a finite element numerical simulation model based on the horizontal directional drilling pipeline retraction process of the S-shaped plane path is established.The construction scheme of the best curvature radius is obtained,and the stress,strain and axial force distribution law in the pipeline retraction process are analyzed.The results show that when entering the 2-3 bending section,the pipe and the guide hole produce a large lateral contact force,and the stress strain increases significantly.The maximum radial tensile stress is 163.8 MPa,and the axial force shows a trend of rapid increase first and then slowly increases.When the pipeline cros-ses the 2-3 bending section,the contact force between the pipeline and the guide hole decreased rapidly,the pipeline is in a suspended state,the local contact with the guide hole is slightly larger,the stress strain value is basically sta-ble,and the pullback force shows a slowly increasing trend,and the local step-by-step increase is presented.Accord-ing to the final calculation of the simulation model,the maximum value of the axial force of the pipeline is 10846 kN,compared with the actual dragback force of 12033 kN,the fitting deviation is only 9.9%.The calculation results are more consistent with the actual situation,and finally the net buoyancy control measures are proposed to provide reference for the construction of the project.
作者
张利铨
ZHANG Liquan(Department of Civil Engineering,Tsinghua University,Beijing 100871,China;Fuzhou Zuohai Holding Group Co.,Ltd.,Fuzhou,Fujian 350001,China)
出处
《水利与建筑工程学报》
2022年第5期1-8,23,共9页
Journal of Water Resources and Architectural Engineering
关键词
S型平面路径
水平定向钻
数值仿真
净浮力控制
S-shaped plane path
horizontal directional drilling
numerical simulation
net buoyancy control
