The main problems on horizontal directionaldrillingmethod of non-excavation in the practical applications were reviewed in the paper.
论述了非开挖水平导向钻进法在实际应用中的主要问题。
2
Method and its application of uneven ground modifying in directionaldrilling locus design are narrated in this article.
叙述了在定向钻进的钻孔轨迹设计时，地面不平整度修正的方法与应用。
3
Simulation method of directionaldrilling course was discussed under limited survey point data, and the reliability of simulation method was analyzed with cases.