ENGINEERING GEOLOGIC PROBLEMS IN PIPELINE PASSING THROUGH LARGE RIVER WITH DIRECTIONAL DRILLING MACHINE

Since the directional drilling technology was introduced into our country in 1980s, tens of large and medium rivers had been passed though successfully. Because engineering geologic conditions act a decisive role when making traverse design and execution project, it is necessary to make systemic engineering geologic investigation. Considering this special engineering, concrete contents and methods are proposed in the paper.