河南栾川钼矿复杂地层探测工艺研究与试验

Research and experiment on complex strata detection for Luanchuan molybdenum mine in Henan province

洛阳栾川钼矿存在的多层采空区以及大量的矿渣堆积地层,导致钻进过程中孔壁极易失稳,一般表现为坍塌、掉块等;同时导致探测设备无法下放至孔底、延误工期。针对这一现状,本文研究了2种新的勘探工艺方法:(1)使用黄土加固孔壁新工艺,使黄土在孔壁上形成一层保护层,即利用挤密加固后的黄土保护孔壁。(2)设计了新型锥形钻头,使用重锤将锥形钻头砸落至采空区底板,利用中空钻杆保护井下电机等探测设备。将2种方法投入实践证明方法可行,并且随着工期的进行,孔壁保持稳定不再出现失稳的情况,为后续对采空区的地质探测提供了安全保障。在经济、安全的前提下保证了施工的顺利实施,并为今后复杂地层的探测积累了一定的经验。

The multilayer goafs and a large number of accumulated tailing strata in Luanchuan molybdenum mine in Luoyang lead to hole wall failure during drilling,which is generally exhibited as collapse,block falling;meanwhile,the detection equipment can not be lowered to the bottom of the hole and the construction period is delayed.In view of this situation,this paper summarizes two new exploration techniques:(1)A new process of strengthening the hole wall with loess is adopted during drilling,by which loess forms a protective layer on the hole wall through compaction.(2)a new type of tapered bit is designed,which can be stricken down to the bottom of the goaf with a heavy hammer;thus,the borehole television and other detection equipment can be run down hole with protection of the central hollow drill string.Field use has proven that the techniques are feasible by repeated field practice,and the hole wall remained stable and no longer appeared unstable with progress of the construction period,providing guarantee for the subsequent geological exploration of goafs.They have ensured the smooth implementation of the operations economically and safely,and also provide reference for the exploration of complex strata in the future.