摘要
针对地铁天安门东站的水平钻孔上偏的现象，分析目前比较容易引起水平钻孔产生上偏的三种原因。
After having pointed out the phenomenon that the horizontal drill hole in the East
Station of Tiananmen was upward-deflection, the author analyzed the three reasons that were
easier to course horizontal drill hole be upward-deflective
出处
《广西地质》
1999年第2期23-26,共4页
Guangxi Geology
