陀螺仪定向纠斜法在中关铁矿区的应用实践

Application Practice of Gyroscope Directional Deviation Correction in Zhongguan Iron Mine Area

摘要:

中关铁矿是20世纪60年代中期探明的储量为9300万t的矿区,因地下水位埋藏深,排水难度大,为防止开采成本大和影响生态环境，决定采用帷幕灌浆方法解决治水问题。帷幕灌浆工程的试验孔对钻孔垂直度要求很高,全孔段孔斜不能大于2 m,防斜、纠斜成一大难题，实践中摸索出陀螺仪定向纠斜法并获得成功。

关键词:帷幕灌浆试验孔;陀螺仪定向纠斜;活楔子;螺杆钻纠斜;钻孔垂直度;中关铁矿

Abstract:

In the mid 1960s, the proven reserve was 93 million tons in Zhongguan iron mine area. Because of the deep groundwater table and difficult drainage, curtain grouting was adopted for water control to avoid high mining cost and protect the ecological environment. The curtain grouting has high demand of borehole verticality, hole deviation of the whole section should not be more than 2 m. Gyroscope directional deviation correction was explored in practice with success.

Key words:curtain grouting test hole; gyroscope directional deviation correction; active chock; deviation correction by PDM; borehole verticality; Zhongguan iron mine