【摘要】 针对目前水平定向钻穿越施工时回拖力只考虑管道回拖力而忽略钻杆和扩孔器回拖力的问题,提出应综合考虑穿越地层地质条件、管道拉力、孔壁摩擦力和流体阻力等因素,建立回拖力的计算模型。介绍了ASTM(American Society of Testingand Material)的回拖力计算方法,并在其基础上推导了考虑钻杆和扩孔器回拖力的回拖力计算方法。通过对两个不同地层条件的工程实例进行模拟计算,考虑钻杆和扩孔器回拖力的回拖力与实际回拖力的最大误差为2.4%,计算结果比仅考虑管道回拖力时更接近实际回拖力。更多还原

【Abstract】 For the problem existing in HDD (Horizontal Directional Drilling) crossing construction, the backtow force of pipeline is often considered, but the backtow force of drill rod and bore reamer is neglected. In the paper, the factors to be considered in geological condition of crossing formations, pipeline pulling force, bore wall friction and fluid resistance are proposed, and calculation model for backtow force is established. The backtow force calculation method based on ASTM (American Society of Testing and Material) is introduced and the calculation method considering the backtow force of drill rod and bore reamer are derived. Researchers have performed simulation calculation for two project examples with different stratigraphic conditions, the maximum error between the backtow force considering the drill rod and bore and the actual pulling backtow forece is 2.4%, the calculated results are more closer to the actual backtow force than that of only considering pipeline backtow force.更多还原